diff --git a/web/main.html b/web/main.html
index 9c454f6..0b7ca19 100644
--- a/web/main.html
+++ b/web/main.html
@@ -28,9 +28,9 @@
   <script src="./src/comboTreePlugin.js"  type="text/javascript"></script>
 
   <script src="./src/jquery.dad.min.js"  type="text/javascript"></script>
-  <!-- 拖动插件 -->
-  <script src="./src/jquery.nestable.js"  type="text/javascript"></script>
 
+  <!-- 拖动插件 -->
+  <script src="./src/Sortable.js"  type="text/javascript"></script>
 
   <!-- table -->
   <script src="./src/FixedTable.js"  type="text/javascript"></script>
diff --git a/web/pages/dashboard.html b/web/pages/dashboard.html
index 233342b..61be4e7 100644
--- a/web/pages/dashboard.html
+++ b/web/pages/dashboard.html
@@ -304,220 +304,11 @@
             
         </div>
       </div>
-      
-      <!-- <div class="layui-footer modify-layui-footer">
-        底部固定区域
-        © layui.com - 底部固定区域
-      </div> -->
+
      </div>
     </div>
 
     <div class="Screen"></div>
-
-    <!-- 导航操作弹窗 -->
-    <!-- <div class="TabOperation_box" id="TabOperation_box">
-        <ul id="TabOperation">
-            <li>
-                <img src="./static/img/xiugai.png"/>
-                <span>重新命名</span>
-            </li>
-            <li>
-                <img src="./static/img/yidong.png"/>
-                <span>移动至</span>
-            </li>
-            <li>
-                <img src="./static/img/fuzhi.png"/>
-                <span>复制看板</span>
-            </li>
-            <li>
-                <img src="./static/img/del.png"/>
-                <span>删除看板</span>
-            </li>
-        </ul>
-    </div> -->
-
-    <!-- 修改看板名称 -->
-    <!-- <div class="modifyname-bg">
-        <div class="modifyname-box">
-            <div class="modifyname-top">
-                <p>看板名称</p>
-                <img src="./static/img/cha.png" id="modifyname-cha"/>
-            </div>
-            <input id="modifynameid" style="display: none;">
-            <div class="modifyname-txt-box">
-                <input type="text" class="modifyname-txt" id="modifyname-txt"/>
-            </div>
-            <div class="modifyname-but-box">
-                <div class="modifyname-qx" id="modifyname-qx">取消</div>
-                <div class="modifyname-qd" id="modifyname-qd">确定</div>
-            </div>
-        </div>
-    </div> -->
-    <!-- 移动看板 -->
-    <!-- <div class="yidong-bg">
-        <div class="yidong-box">
-            <div class="yidong-top">
-                <p>移动至</p>
-                <img src="./static/img/cha.png" id="yidong-cha"/>
-            </div>
-            <input id="yidongid" style="display: none;">
-            <div class="yidong-tab-box">
-                <div class="yidong-tab">
-                    <div class="tabdata" id='yidongkanban' onclick="tabdata('yidongkanban','yidong')">我的看板</div>
-                    <div id='yidongkongjian' onclick="tabdata('yidongkongjian','yidong')">项目空间</div>
-                </div>
-            </div>
-            <div class="yidong-txt-box">
-                <input type="text" class="justAnotherInputBox1" placeholder=""/>
-                <input type="text" class="justAnotherInputBox2" placeholder=""/>
-            </div>
-            <div class="yidong-but-box">
-                <div class="yidong-qx" id="yidong-qx">取消</div>
-                <div class="yidong-qd" id="yidong-qd">确定</div>
-            </div>
-        </div>
-    </div> -->
-
-    <!-- 复制看板 -->
-    <!-- <div class="copy-bg">
-        <div class="copy-box">
-            <div class="copy-top">
-                <p>复制看板</p>
-                <img src="./static/img/cha.png" id="copy-cha"/>
-            </div>
-            <input id="copyid" style="display: none;">
-            <div class="copy-name-box">
-                <div class="copy-title">看板名称</div>
-                <input type="text" class="copyname-txt" id="copyname-txt"/>
-            </div>
-            <div class="copy-tab-box">
-                <div class="copy-title">添加至</div>
-                <div class="copy-tab">
-                    <div class="tabdata" id='copykanban' onclick="tabdata('copykanban','copy')">我的看板</div>
-                    <div id='copykongjian' onclick="tabdata('copykongjian','copy')">项目空间</div>
-                </div>
-            </div>
-            <div class="copy-txt-box">
-                <input type="text" class="justAnotherInputBox1" placeholder=""/>
-                <input type="text" class="justAnotherInputBox2" placeholder=""/>
-            </div>
-            <div class="copy-tishi"> <img src="./static/img/capytishi.png"/> 复制看板将同时复制看板内的报表 </div>
-            <div class="copy-but-box">
-                <div class="copy-qx" id="copy-qx">取消</div>
-                <div class="copy-qd" id="copy-qd">确定</div>
-            </div>
-        </div>
-    </div> -->
-
-    <!-- 删除 -->
-    <!-- <div class="del-bg">
-        <div class="del-box">
-            <div class="del-xinxi">
-                <div class="del-tit"><img src="./static/img/redtishi.png">操作提示</div>
-                <p class="del-tishi">确认删除【<span id="del-tit"></span>】?该操作不可恢复</p>
-            </div>
-            <input id="delid" style="display: none;">
-            <div class="del-but-box">
-                <div class="del-qx" id="del-qx">取消</div>
-                <div class="del-qd" id="del-qd">删除</div>
-            </div>
-        </div>
-    </div> -->
-
-    <!-- 控件设置 -->
-    <!-- <div class="kongjian-bg">
-        <div class="kongjian-box">
-            <div class="chuangjiankongjian-box">
-                <p class="chuangjiankongjian-tit">创建空间</p>
-                <p class="chuangjiankongjian-tit2">选择成员创建共享空间，添加看板至空间实现统一共享</p>
-            </div>
-            <div class="kongjian-mc-box">
-                <span>空间名称</span>
-                <input type="text" placeholder="测试"/>
-            </div>
-            <div class="kongjian-mc-box" style="margin-top: 16px;">
-                <span>空间成员</span>
-                <div class="kongjian-tianjia">+添加</div>
-            </div>
-            <div class="kongjian-renyuan-box">
-                
-            </div>
-            <div class="kongjian-but-box">
-                <ul class="layui-nav kongjian-cz">
-                    <li class="layui-nav-item">
-                        <a href="javascript:;">更多操作</a>
-                        <dl class="layui-nav-child">
-                            <dd><a href="">移交空间</a></dd>
-                            <dd><a href="">删除空间</a></dd>
-                        </dl>
-                    </li>
-                </ul>
-                <div class="kongjian-but">
-                    <div class="kongjian-qx" id="kongjian-qx">取消</div>
-                    <div class="kongjian-qd" id="kongjian-qd">完成</div>
-                </div>
-            </div>
-        </div>
-    </div> -->
-
-    <!-- 新建看板 -->
-    <!-- <div class="new-bg">
-        <div class="new-box">
-            <div class="new-top">
-                <p>新建看板</p>
-                <img src="./static/img/cha.png" id="new-cha"/>
-            </div>
-            <div class="new-name-box">
-                <div class="new-title">看板名称</div>
-                <input type="text" class="newname-txt" id="newname-txt"/>
-            </div>
-            <div class="new-tab-box">
-                <div class="new-title">添加至</div>
-                <div class="new-tab">
-                    <div class="tabdata" id='newkanban' onclick="tabdata('newkanban','new')">我的看板</div>
-                    <div id='newkongjian' onclick="tabdata('newkongjian','new')">项目空间</div>
-                </div>
-            </div>
-            <div class="new-txt-box">
-                <input type="text" class="justAnotherInputBox1" placeholder=""/>
-                <input type="text" class="justAnotherInputBox2" placeholder=""/>
-            </div>
-            <div class="new-but-box">
-                <div class="new-qx" id="new-qx">取消</div>
-                <div class="new-qd" id="new-qd">确定</div>
-            </div>
-        </div>
-    </div> -->
-
-    <!-- 新建文件夹 -->
-    <!-- <div class="newwenjian-bg">
-        <div class="newwenjian-box">
-            <div class="newwenjian-top">
-                <p>新建文件夹</p>
-                <img src="./static/img/cha.png" id="newwenjian-cha"/>
-            </div>
-            <div class="newwenjian-name-box">
-                <div class="newwenjian-title">文件夹名称</div>
-                <input type="text" class="newwenjianname-txt" id="newwenjianname-txt"/>
-            </div>
-            <div class="newwenjian-tab-box">
-                <div class="newwenjian-title">添加至</div>
-                <div class="newwenjian-tab">
-                    <div class="tabdata" id='newwenjiankanban' onclick="tabdata('newwenjiankanban','newwenjian')">我的看板</div>
-                    <div id='newwenjiankongjian' onclick="tabdata('newwenjiankongjian','newwenjian')">项目空间</div>
-                </div>
-            </div>
-            <div class="newwenjian-txt-box">
-                <input type="text" class="justAnotherInputBox1" placeholder="" style="display: none;"/>
-                <input type="text" class="justAnotherInputBox2" placeholder=""/>
-            </div>
-            <div class="newwenjian-but-box">
-                <div class="newwenjian-qx" id="newwenjian-qx">取消</div>
-                <div class="newwenjian-qd" id="newwenjian-qd">确定</div>
-            </div>
-        </div>
-    </div> -->
-
 <script id="layui-project-dot" type="text/html">
     <li class="layui-nav-item">
         <a href="javascript:;" class="projecttit"></a>
@@ -566,43 +357,20 @@
         <li class="layui-nav-item layui-nav-itemed">
             <a href="javascript:;" class="fontcolor mykanban category xiangmukongjian" data-id="{{item._id}}"> 
                 <i class="layui-icon layui-icon-template-1"></i> {{item.name}} 
-                <img src="./static/img/renyuan.png" class="nav-space-bar" data-id="{{item._id}}"/></a>
+                <img src="./static/img/renyuan.png" class="nav-space-bar" data-id="{{item._id}}"/>
+            </a>
             <dl class="layui-nav-child modeify-layui-nav-child" id="sidebar-box">
-
                 {{#  layui.each(item.children, function(indexs, items){ }}
                     {{#  if(items.onclick == 1){ }}
-                        <dd class="layui-left-dd layui-this"  data-id="{{items._id}}"><a href="javascript:;" class="fontcolor second category"> <span>{{items.name}}</span>
+                        <dd class="layui-left-dd layui-this"  data-id="{{items._id}}"><a href="javascript:;" class="fontcolor second category"> <span class="tuodong">{{items.name}}</span>
                             <img src="./static/img/gengduo.png" alt="" class="nav-action-bar" data-id="{{items._id}}"></a>
                         </dd>
                     {{#  } else { }}
-                        <dd class="layui-left-dd"  data-id="{{items._id}}"><a href="javascript:;" class="fontcolor second category"> <span>{{items.name}}</span>
+                        <dd class="layui-left-dd"  data-id="{{items._id}}"><a href="javascript:;" class="fontcolor second category"> <span class="tuodong">{{items.name}}</span>
                             <img src="./static/img/gengduo.png" alt="" class="nav-action-bar" data-id="{{items._id}}"></a>
                         </dd>
                     {{#  } }}
-                    <!-- {{#  if(items.isFolder === true){ }}
-                    <li class="layui-nav-item">
-                        <a href="javascript:;" class="fontcolor mykanban second category xiangmukongjian" data-id="{{items._id}}"> <i class="layui-icon layui-icon-file-b"></i> {{items.name}}
-                        <img src="./static/img/gengduo.png" class="nav-file-bar" data-id="{{items._id}}"/></a>
-                        {{#  layui.each(items.children, function(value, datas){ }}
-                            <dl class="layui-nav-child modeify-layui-nav-child">
-                                <dd class="layui-left-dd"  data-id="{{datas._id}}"><a href="javascript:;" class="fontcolor second3 category"> <span>{{datas.name}}</span>
-                                <img src="./static/img/gengduo.png" alt="" class="nav-action-bar" data-id="{{datas._id}}"></a></dd>
-                            </dl>
-                        {{#  }); }}
-                    </li> -->
-                    <!-- {{#  } else { }} -->
-                        <!-- {{#  if(indexs == 0){ }}
-                        <dd class="layui-left-dd layui-this" data-id="{{items._id}}"><a href="javascript:;" class="fontcolor second category"> <span>{{items.name}} </span>
-                            <img src="./static/img/gengduo.png" alt="" class="nav-action-bar" data-id="{{items._id}}"></a>
-                        </dd>
-                        {{#  } else { }} -->
-                            <!-- <dd class="layui-left-dd"  data-id="{{items._id}}"><a href="javascript:;" class="fontcolor second category"> <span>{{items.name}} </span>
-                                <img src="./static/img/gengduo.png" alt="" class="nav-action-bar" data-id="{{items._id}}"></a>
-                            </dd> -->
-                        <!-- {{#  } }}  -->
-                    <!-- {{#  } }}  -->
                 {{#  }); }}
-               
             </dl>
         </li>
         {{#  } }} 
diff --git a/web/src/Sortable.js b/web/src/Sortable.js
new file mode 100644
index 0000000..c6d7f9d
--- /dev/null
+++ b/web/src/Sortable.js
@@ -0,0 +1,3709 @@
+/**!
+ * Sortable 1.10.2
+ * @author	RubaXa   <trash@rubaxa.org>
+ * @author	owenm    <owen23355@gmail.com>
+ * @license MIT
+ */
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global = global || self, global.Sortable = factory());
+}(this, function () { 'use strict';
+
+  function _typeof(obj) {
+    if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
+      _typeof = function (obj) {
+        return typeof obj;
+      };
+    } else {
+      _typeof = function (obj) {
+        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+      };
+    }
+
+    return _typeof(obj);
+  }
+
+  function _defineProperty(obj, key, value) {
+    if (key in obj) {
+      Object.defineProperty(obj, key, {
+        value: value,
+        enumerable: true,
+        configurable: true,
+        writable: true
+      });
+    } else {
+      obj[key] = value;
+    }
+
+    return obj;
+  }
+
+  function _extends() {
+    _extends = Object.assign || function (target) {
+      for (var i = 1; i < arguments.length; i++) {
+        var source = arguments[i];
+
+        for (var key in source) {
+          if (Object.prototype.hasOwnProperty.call(source, key)) {
+            target[key] = source[key];
+          }
+        }
+      }
+
+      return target;
+    };
+
+    return _extends.apply(this, arguments);
+  }
+
+  function _objectSpread(target) {
+    for (var i = 1; i < arguments.length; i++) {
+      var source = arguments[i] != null ? arguments[i] : {};
+      var ownKeys = Object.keys(source);
+
+      if (typeof Object.getOwnPropertySymbols === 'function') {
+        ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) {
+          return Object.getOwnPropertyDescriptor(source, sym).enumerable;
+        }));
+      }
+
+      ownKeys.forEach(function (key) {
+        _defineProperty(target, key, source[key]);
+      });
+    }
+
+    return target;
+  }
+
+  function _objectWithoutPropertiesLoose(source, excluded) {
+    if (source == null) return {};
+    var target = {};
+    var sourceKeys = Object.keys(source);
+    var key, i;
+
+    for (i = 0; i < sourceKeys.length; i++) {
+      key = sourceKeys[i];
+      if (excluded.indexOf(key) >= 0) continue;
+      target[key] = source[key];
+    }
+
+    return target;
+  }
+
+  function _objectWithoutProperties(source, excluded) {
+    if (source == null) return {};
+
+    var target = _objectWithoutPropertiesLoose(source, excluded);
+
+    var key, i;
+
+    if (Object.getOwnPropertySymbols) {
+      var sourceSymbolKeys = Object.getOwnPropertySymbols(source);
+
+      for (i = 0; i < sourceSymbolKeys.length; i++) {
+        key = sourceSymbolKeys[i];
+        if (excluded.indexOf(key) >= 0) continue;
+        if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
+        target[key] = source[key];
+      }
+    }
+
+    return target;
+  }
+
+  function _toConsumableArray(arr) {
+    return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
+  }
+
+  function _arrayWithoutHoles(arr) {
+    if (Array.isArray(arr)) {
+      for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];
+
+      return arr2;
+    }
+  }
+
+  function _iterableToArray(iter) {
+    if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
+  }
+
+  function _nonIterableSpread() {
+    throw new TypeError("Invalid attempt to spread non-iterable instance");
+  }
+
+  var version = "1.10.2";
+
+  function userAgent(pattern) {
+    if (typeof window !== 'undefined' && window.navigator) {
+      return !!
+      /*@__PURE__*/
+      navigator.userAgent.match(pattern);
+    }
+  }
+
+  var IE11OrLess = userAgent(/(?:Trident.*rv[ :]?11\.|msie|iemobile|Windows Phone)/i);
+  var Edge = userAgent(/Edge/i);
+  var FireFox = userAgent(/firefox/i);
+  var Safari = userAgent(/safari/i) && !userAgent(/chrome/i) && !userAgent(/android/i);
+  var IOS = userAgent(/iP(ad|od|hone)/i);
+  var ChromeForAndroid = userAgent(/chrome/i) && userAgent(/android/i);
+
+  var captureMode = {
+    capture: false,
+    passive: false
+  };
+
+  function on(el, event, fn) {
+    el.addEventListener(event, fn, !IE11OrLess && captureMode);
+  }
+
+  function off(el, event, fn) {
+    el.removeEventListener(event, fn, !IE11OrLess && captureMode);
+  }
+
+  function matches(
+  /**HTMLElement*/
+  el,
+  /**String*/
+  selector) {
+    if (!selector) return;
+    selector[0] === '>' && (selector = selector.substring(1));
+
+    if (el) {
+      try {
+        if (el.matches) {
+          return el.matches(selector);
+        } else if (el.msMatchesSelector) {
+          return el.msMatchesSelector(selector);
+        } else if (el.webkitMatchesSelector) {
+          return el.webkitMatchesSelector(selector);
+        }
+      } catch (_) {
+        return false;
+      }
+    }
+
+    return false;
+  }
+
+  function getParentOrHost(el) {
+    return el.host && el !== document && el.host.nodeType ? el.host : el.parentNode;
+  }
+
+  function closest(
+  /**HTMLElement*/
+  el,
+  /**String*/
+  selector,
+  /**HTMLElement*/
+  ctx, includeCTX) {
+    if (el) {
+      ctx = ctx || document;
+
+      do {
+        if (selector != null && (selector[0] === '>' ? el.parentNode === ctx && matches(el, selector) : matches(el, selector)) || includeCTX && el === ctx) {
+          return el;
+        }
+
+        if (el === ctx) break;
+        /* jshint boss:true */
+      } while (el = getParentOrHost(el));
+    }
+
+    return null;
+  }
+
+  var R_SPACE = /\s+/g;
+
+  function toggleClass(el, name, state) {
+    if (el && name) {
+      if (el.classList) {
+        el.classList[state ? 'add' : 'remove'](name);
+      } else {
+        var className = (' ' + el.className + ' ').replace(R_SPACE, ' ').replace(' ' + name + ' ', ' ');
+        el.className = (className + (state ? ' ' + name : '')).replace(R_SPACE, ' ');
+      }
+    }
+  }
+
+  function css(el, prop, val) {
+    var style = el && el.style;
+
+    if (style) {
+      if (val === void 0) {
+        if (document.defaultView && document.defaultView.getComputedStyle) {
+          val = document.defaultView.getComputedStyle(el, '');
+        } else if (el.currentStyle) {
+          val = el.currentStyle;
+        }
+
+        return prop === void 0 ? val : val[prop];
+      } else {
+        if (!(prop in style) && prop.indexOf('webkit') === -1) {
+          prop = '-webkit-' + prop;
+        }
+
+        style[prop] = val + (typeof val === 'string' ? '' : 'px');
+      }
+    }
+  }
+
+  function matrix(el, selfOnly) {
+    var appliedTransforms = '';
+
+    if (typeof el === 'string') {
+      appliedTransforms = el;
+    } else {
+      do {
+        var transform = css(el, 'transform');
+
+        if (transform && transform !== 'none') {
+          appliedTransforms = transform + ' ' + appliedTransforms;
+        }
+        /* jshint boss:true */
+
+      } while (!selfOnly && (el = el.parentNode));
+    }
+
+    var matrixFn = window.DOMMatrix || window.WebKitCSSMatrix || window.CSSMatrix || window.MSCSSMatrix;
+    /*jshint -W056 */
+
+    return matrixFn && new matrixFn(appliedTransforms);
+  }
+
+  function find(ctx, tagName, iterator) {
+    if (ctx) {
+      var list = ctx.getElementsByTagName(tagName),
+          i = 0,
+          n = list.length;
+
+      if (iterator) {
+        for (; i < n; i++) {
+          iterator(list[i], i);
+        }
+      }
+
+      return list;
+    }
+
+    return [];
+  }
+
+  function getWindowScrollingElement() {
+    var scrollingElement = document.scrollingElement;
+
+    if (scrollingElement) {
+      return scrollingElement;
+    } else {
+      return document.documentElement;
+    }
+  }
+  /**
+   * Returns the "bounding client rect" of given element
+   * @param  {HTMLElement} el                       The element whose boundingClientRect is wanted
+   * @param  {[Boolean]} relativeToContainingBlock  Whether the rect should be relative to the containing block of (including) the container
+   * @param  {[Boolean]} relativeToNonStaticParent  Whether the rect should be relative to the relative parent of (including) the contaienr
+   * @param  {[Boolean]} undoScale                  Whether the container's scale() should be undone
+   * @param  {[HTMLElement]} container              The parent the element will be placed in
+   * @return {Object}                               The boundingClientRect of el, with specified adjustments
+   */
+
+
+  function getRect(el, relativeToContainingBlock, relativeToNonStaticParent, undoScale, container) {
+    if (!el.getBoundingClientRect && el !== window) return;
+    var elRect, top, left, bottom, right, height, width;
+
+    if (el !== window && el !== getWindowScrollingElement()) {
+      elRect = el.getBoundingClientRect();
+      top = elRect.top;
+      left = elRect.left;
+      bottom = elRect.bottom;
+      right = elRect.right;
+      height = elRect.height;
+      width = elRect.width;
+    } else {
+      top = 0;
+      left = 0;
+      bottom = window.innerHeight;
+      right = window.innerWidth;
+      height = window.innerHeight;
+      width = window.innerWidth;
+    }
+
+    if ((relativeToContainingBlock || relativeToNonStaticParent) && el !== window) {
+      // Adjust for translate()
+      container = container || el.parentNode; // solves #1123 (see: https://stackoverflow.com/a/37953806/6088312)
+      // Not needed on <= IE11
+
+      if (!IE11OrLess) {
+        do {
+          if (container && container.getBoundingClientRect && (css(container, 'transform') !== 'none' || relativeToNonStaticParent && css(container, 'position') !== 'static')) {
+            var containerRect = container.getBoundingClientRect(); // Set relative to edges of padding box of container
+
+            top -= containerRect.top + parseInt(css(container, 'border-top-width'));
+            left -= containerRect.left + parseInt(css(container, 'border-left-width'));
+            bottom = top + elRect.height;
+            right = left + elRect.width;
+            break;
+          }
+          /* jshint boss:true */
+
+        } while (container = container.parentNode);
+      }
+    }
+
+    if (undoScale && el !== window) {
+      // Adjust for scale()
+      var elMatrix = matrix(container || el),
+          scaleX = elMatrix && elMatrix.a,
+          scaleY = elMatrix && elMatrix.d;
+
+      if (elMatrix) {
+        top /= scaleY;
+        left /= scaleX;
+        width /= scaleX;
+        height /= scaleY;
+        bottom = top + height;
+        right = left + width;
+      }
+    }
+
+    return {
+      top: top,
+      left: left,
+      bottom: bottom,
+      right: right,
+      width: width,
+      height: height
+    };
+  }
+  /**
+   * Checks if a side of an element is scrolled past a side of its parents
+   * @param  {HTMLElement}  el           The element who's side being scrolled out of view is in question
+   * @param  {String}       elSide       Side of the element in question ('top', 'left', 'right', 'bottom')
+   * @param  {String}       parentSide   Side of the parent in question ('top', 'left', 'right', 'bottom')
+   * @return {HTMLElement}               The parent scroll element that the el's side is scrolled past, or null if there is no such element
+   */
+
+
+  function isScrolledPast(el, elSide, parentSide) {
+    var parent = getParentAutoScrollElement(el, true),
+        elSideVal = getRect(el)[elSide];
+    /* jshint boss:true */
+
+    while (parent) {
+      var parentSideVal = getRect(parent)[parentSide],
+          visible = void 0;
+
+      if (parentSide === 'top' || parentSide === 'left') {
+        visible = elSideVal >= parentSideVal;
+      } else {
+        visible = elSideVal <= parentSideVal;
+      }
+
+      if (!visible) return parent;
+      if (parent === getWindowScrollingElement()) break;
+      parent = getParentAutoScrollElement(parent, false);
+    }
+
+    return false;
+  }
+  /**
+   * Gets nth child of el, ignoring hidden children, sortable's elements (does not ignore clone if it's visible)
+   * and non-draggable elements
+   * @param  {HTMLElement} el       The parent element
+   * @param  {Number} childNum      The index of the child
+   * @param  {Object} options       Parent Sortable's options
+   * @return {HTMLElement}          The child at index childNum, or null if not found
+   */
+
+
+  function getChild(el, childNum, options) {
+    var currentChild = 0,
+        i = 0,
+        children = el.children;
+
+    while (i < children.length) {
+      if (children[i].style.display !== 'none' && children[i] !== Sortable.ghost && children[i] !== Sortable.dragged && closest(children[i], options.draggable, el, false)) {
+        if (currentChild === childNum) {
+          return children[i];
+        }
+
+        currentChild++;
+      }
+
+      i++;
+    }
+
+    return null;
+  }
+  /**
+   * Gets the last child in the el, ignoring ghostEl or invisible elements (clones)
+   * @param  {HTMLElement} el       Parent element
+   * @param  {selector} selector    Any other elements that should be ignored
+   * @return {HTMLElement}          The last child, ignoring ghostEl
+   */
+
+
+  function lastChild(el, selector) {
+    var last = el.lastElementChild;
+
+    while (last && (last === Sortable.ghost || css(last, 'display') === 'none' || selector && !matches(last, selector))) {
+      last = last.previousElementSibling;
+    }
+
+    return last || null;
+  }
+  /**
+   * Returns the index of an element within its parent for a selected set of
+   * elements
+   * @param  {HTMLElement} el
+   * @param  {selector} selector
+   * @return {number}
+   */
+
+
+  function index(el, selector) {
+    var index = 0;
+
+    if (!el || !el.parentNode) {
+      return -1;
+    }
+    /* jshint boss:true */
+
+
+    while (el = el.previousElementSibling) {
+      if (el.nodeName.toUpperCase() !== 'TEMPLATE' && el !== Sortable.clone && (!selector || matches(el, selector))) {
+        index++;
+      }
+    }
+
+    return index;
+  }
+  /**
+   * Returns the scroll offset of the given element, added with all the scroll offsets of parent elements.
+   * The value is returned in real pixels.
+   * @param  {HTMLElement} el
+   * @return {Array}             Offsets in the format of [left, top]
+   */
+
+
+  function getRelativeScrollOffset(el) {
+    var offsetLeft = 0,
+        offsetTop = 0,
+        winScroller = getWindowScrollingElement();
+
+    if (el) {
+      do {
+        var elMatrix = matrix(el),
+            scaleX = elMatrix.a,
+            scaleY = elMatrix.d;
+        offsetLeft += el.scrollLeft * scaleX;
+        offsetTop += el.scrollTop * scaleY;
+      } while (el !== winScroller && (el = el.parentNode));
+    }
+
+    return [offsetLeft, offsetTop];
+  }
+  /**
+   * Returns the index of the object within the given array
+   * @param  {Array} arr   Array that may or may not hold the object
+   * @param  {Object} obj  An object that has a key-value pair unique to and identical to a key-value pair in the object you want to find
+   * @return {Number}      The index of the object in the array, or -1
+   */
+
+
+  function indexOfObject(arr, obj) {
+    for (var i in arr) {
+      if (!arr.hasOwnProperty(i)) continue;
+
+      for (var key in obj) {
+        if (obj.hasOwnProperty(key) && obj[key] === arr[i][key]) return Number(i);
+      }
+    }
+
+    return -1;
+  }
+
+  function getParentAutoScrollElement(el, includeSelf) {
+    // skip to window
+    if (!el || !el.getBoundingClientRect) return getWindowScrollingElement();
+    var elem = el;
+    var gotSelf = false;
+
+    do {
+      // we don't need to get elem css if it isn't even overflowing in the first place (performance)
+      if (elem.clientWidth < elem.scrollWidth || elem.clientHeight < elem.scrollHeight) {
+        var elemCSS = css(elem);
+
+        if (elem.clientWidth < elem.scrollWidth && (elemCSS.overflowX == 'auto' || elemCSS.overflowX == 'scroll') || elem.clientHeight < elem.scrollHeight && (elemCSS.overflowY == 'auto' || elemCSS.overflowY == 'scroll')) {
+          if (!elem.getBoundingClientRect || elem === document.body) return getWindowScrollingElement();
+          if (gotSelf || includeSelf) return elem;
+          gotSelf = true;
+        }
+      }
+      /* jshint boss:true */
+
+    } while (elem = elem.parentNode);
+
+    return getWindowScrollingElement();
+  }
+
+  function extend(dst, src) {
+    if (dst && src) {
+      for (var key in src) {
+        if (src.hasOwnProperty(key)) {
+          dst[key] = src[key];
+        }
+      }
+    }
+
+    return dst;
+  }
+
+  function isRectEqual(rect1, rect2) {
+    return Math.round(rect1.top) === Math.round(rect2.top) && Math.round(rect1.left) === Math.round(rect2.left) && Math.round(rect1.height) === Math.round(rect2.height) && Math.round(rect1.width) === Math.round(rect2.width);
+  }
+
+  var _throttleTimeout;
+
+  function throttle(callback, ms) {
+    return function () {
+      if (!_throttleTimeout) {
+        var args = arguments,
+            _this = this;
+
+        if (args.length === 1) {
+          callback.call(_this, args[0]);
+        } else {
+          callback.apply(_this, args);
+        }
+
+        _throttleTimeout = setTimeout(function () {
+          _throttleTimeout = void 0;
+        }, ms);
+      }
+    };
+  }
+
+  function cancelThrottle() {
+    clearTimeout(_throttleTimeout);
+    _throttleTimeout = void 0;
+  }
+
+  function scrollBy(el, x, y) {
+    el.scrollLeft += x;
+    el.scrollTop += y;
+  }
+
+  function clone(el) {
+    var Polymer = window.Polymer;
+    var $ = window.jQuery || window.Zepto;
+
+    if (Polymer && Polymer.dom) {
+      return Polymer.dom(el).cloneNode(true);
+    } else if ($) {
+      return $(el).clone(true)[0];
+    } else {
+      return el.cloneNode(true);
+    }
+  }
+
+  function setRect(el, rect) {
+    css(el, 'position', 'absolute');
+    css(el, 'top', rect.top);
+    css(el, 'left', rect.left);
+    css(el, 'width', rect.width);
+    css(el, 'height', rect.height);
+  }
+
+  function unsetRect(el) {
+    css(el, 'position', '');
+    css(el, 'top', '');
+    css(el, 'left', '');
+    css(el, 'width', '');
+    css(el, 'height', '');
+  }
+
+  var expando = 'Sortable' + new Date().getTime();
+
+  function AnimationStateManager() {
+    var animationStates = [],
+        animationCallbackId;
+    return {
+      captureAnimationState: function captureAnimationState() {
+        animationStates = [];
+        if (!this.options.animation) return;
+        var children = [].slice.call(this.el.children);
+        children.forEach(function (child) {
+          if (css(child, 'display') === 'none' || child === Sortable.ghost) return;
+          animationStates.push({
+            target: child,
+            rect: getRect(child)
+          });
+
+          var fromRect = _objectSpread({}, animationStates[animationStates.length - 1].rect); // If animating: compensate for current animation
+
+
+          if (child.thisAnimationDuration) {
+            var childMatrix = matrix(child, true);
+
+            if (childMatrix) {
+              fromRect.top -= childMatrix.f;
+              fromRect.left -= childMatrix.e;
+            }
+          }
+
+          child.fromRect = fromRect;
+        });
+      },
+      addAnimationState: function addAnimationState(state) {
+        animationStates.push(state);
+      },
+      removeAnimationState: function removeAnimationState(target) {
+        animationStates.splice(indexOfObject(animationStates, {
+          target: target
+        }), 1);
+      },
+      animateAll: function animateAll(callback) {
+        var _this = this;
+
+        if (!this.options.animation) {
+          clearTimeout(animationCallbackId);
+          if (typeof callback === 'function') callback();
+          return;
+        }
+
+        var animating = false,
+            animationTime = 0;
+        animationStates.forEach(function (state) {
+          var time = 0,
+              target = state.target,
+              fromRect = target.fromRect,
+              toRect = getRect(target),
+              prevFromRect = target.prevFromRect,
+              prevToRect = target.prevToRect,
+              animatingRect = state.rect,
+              targetMatrix = matrix(target, true);
+
+          if (targetMatrix) {
+            // Compensate for current animation
+            toRect.top -= targetMatrix.f;
+            toRect.left -= targetMatrix.e;
+          }
+
+          target.toRect = toRect;
+
+          if (target.thisAnimationDuration) {
+            // Could also check if animatingRect is between fromRect and toRect
+            if (isRectEqual(prevFromRect, toRect) && !isRectEqual(fromRect, toRect) && // Make sure animatingRect is on line between toRect & fromRect
+            (animatingRect.top - toRect.top) / (animatingRect.left - toRect.left) === (fromRect.top - toRect.top) / (fromRect.left - toRect.left)) {
+              // If returning to same place as started from animation and on same axis
+              time = calculateRealTime(animatingRect, prevFromRect, prevToRect, _this.options);
+            }
+          } // if fromRect != toRect: animate
+
+
+          if (!isRectEqual(toRect, fromRect)) {
+            target.prevFromRect = fromRect;
+            target.prevToRect = toRect;
+
+            if (!time) {
+              time = _this.options.animation;
+            }
+
+            _this.animate(target, animatingRect, toRect, time);
+          }
+
+          if (time) {
+            animating = true;
+            animationTime = Math.max(animationTime, time);
+            clearTimeout(target.animationResetTimer);
+            target.animationResetTimer = setTimeout(function () {
+              target.animationTime = 0;
+              target.prevFromRect = null;
+              target.fromRect = null;
+              target.prevToRect = null;
+              target.thisAnimationDuration = null;
+            }, time);
+            target.thisAnimationDuration = time;
+          }
+        });
+        clearTimeout(animationCallbackId);
+
+        if (!animating) {
+          if (typeof callback === 'function') callback();
+        } else {
+          animationCallbackId = setTimeout(function () {
+            if (typeof callback === 'function') callback();
+          }, animationTime);
+        }
+
+        animationStates = [];
+      },
+      animate: function animate(target, currentRect, toRect, duration) {
+        if (duration) {
+          css(target, 'transition', '');
+          css(target, 'transform', '');
+          var elMatrix = matrix(this.el),
+              scaleX = elMatrix && elMatrix.a,
+              scaleY = elMatrix && elMatrix.d,
+              translateX = (currentRect.left - toRect.left) / (scaleX || 1),
+              translateY = (currentRect.top - toRect.top) / (scaleY || 1);
+          target.animatingX = !!translateX;
+          target.animatingY = !!translateY;
+          css(target, 'transform', 'translate3d(' + translateX + 'px,' + translateY + 'px,0)');
+          repaint(target); // repaint
+
+          css(target, 'transition', 'transform ' + duration + 'ms' + (this.options.easing ? ' ' + this.options.easing : ''));
+          css(target, 'transform', 'translate3d(0,0,0)');
+          typeof target.animated === 'number' && clearTimeout(target.animated);
+          target.animated = setTimeout(function () {
+            css(target, 'transition', '');
+            css(target, 'transform', '');
+            target.animated = false;
+            target.animatingX = false;
+            target.animatingY = false;
+          }, duration);
+        }
+      }
+    };
+  }
+
+  function repaint(target) {
+    return target.offsetWidth;
+  }
+
+  function calculateRealTime(animatingRect, fromRect, toRect, options) {
+    return Math.sqrt(Math.pow(fromRect.top - animatingRect.top, 2) + Math.pow(fromRect.left - animatingRect.left, 2)) / Math.sqrt(Math.pow(fromRect.top - toRect.top, 2) + Math.pow(fromRect.left - toRect.left, 2)) * options.animation;
+  }
+
+  var plugins = [];
+  var defaults = {
+    initializeByDefault: true
+  };
+  var PluginManager = {
+    mount: function mount(plugin) {
+      // Set default static properties
+      for (var option in defaults) {
+        if (defaults.hasOwnProperty(option) && !(option in plugin)) {
+          plugin[option] = defaults[option];
+        }
+      }
+
+      plugins.push(plugin);
+    },
+    pluginEvent: function pluginEvent(eventName, sortable, evt) {
+      var _this = this;
+
+      this.eventCanceled = false;
+
+      evt.cancel = function () {
+        _this.eventCanceled = true;
+      };
+
+      var eventNameGlobal = eventName + 'Global';
+      plugins.forEach(function (plugin) {
+        if (!sortable[plugin.pluginName]) return; // Fire global events if it exists in this sortable
+
+        if (sortable[plugin.pluginName][eventNameGlobal]) {
+          sortable[plugin.pluginName][eventNameGlobal](_objectSpread({
+            sortable: sortable
+          }, evt));
+        } // Only fire plugin event if plugin is enabled in this sortable,
+        // and plugin has event defined
+
+
+        if (sortable.options[plugin.pluginName] && sortable[plugin.pluginName][eventName]) {
+          sortable[plugin.pluginName][eventName](_objectSpread({
+            sortable: sortable
+          }, evt));
+        }
+      });
+    },
+    initializePlugins: function initializePlugins(sortable, el, defaults, options) {
+      plugins.forEach(function (plugin) {
+        var pluginName = plugin.pluginName;
+        if (!sortable.options[pluginName] && !plugin.initializeByDefault) return;
+        var initialized = new plugin(sortable, el, sortable.options);
+        initialized.sortable = sortable;
+        initialized.options = sortable.options;
+        sortable[pluginName] = initialized; // Add default options from plugin
+
+        _extends(defaults, initialized.defaults);
+      });
+
+      for (var option in sortable.options) {
+        if (!sortable.options.hasOwnProperty(option)) continue;
+        var modified = this.modifyOption(sortable, option, sortable.options[option]);
+
+        if (typeof modified !== 'undefined') {
+          sortable.options[option] = modified;
+        }
+      }
+    },
+    getEventProperties: function getEventProperties(name, sortable) {
+      var eventProperties = {};
+      plugins.forEach(function (plugin) {
+        if (typeof plugin.eventProperties !== 'function') return;
+
+        _extends(eventProperties, plugin.eventProperties.call(sortable[plugin.pluginName], name));
+      });
+      return eventProperties;
+    },
+    modifyOption: function modifyOption(sortable, name, value) {
+      var modifiedValue;
+      plugins.forEach(function (plugin) {
+        // Plugin must exist on the Sortable
+        if (!sortable[plugin.pluginName]) return; // If static option listener exists for this option, call in the context of the Sortable's instance of this plugin
+
+        if (plugin.optionListeners && typeof plugin.optionListeners[name] === 'function') {
+          modifiedValue = plugin.optionListeners[name].call(sortable[plugin.pluginName], value);
+        }
+      });
+      return modifiedValue;
+    }
+  };
+
+  function dispatchEvent(_ref) {
+    var sortable = _ref.sortable,
+        rootEl = _ref.rootEl,
+        name = _ref.name,
+        targetEl = _ref.targetEl,
+        cloneEl = _ref.cloneEl,
+        toEl = _ref.toEl,
+        fromEl = _ref.fromEl,
+        oldIndex = _ref.oldIndex,
+        newIndex = _ref.newIndex,
+        oldDraggableIndex = _ref.oldDraggableIndex,
+        newDraggableIndex = _ref.newDraggableIndex,
+        originalEvent = _ref.originalEvent,
+        putSortable = _ref.putSortable,
+        extraEventProperties = _ref.extraEventProperties;
+    sortable = sortable || rootEl && rootEl[expando];
+    if (!sortable) return;
+    var evt,
+        options = sortable.options,
+        onName = 'on' + name.charAt(0).toUpperCase() + name.substr(1); // Support for new CustomEvent feature
+
+    if (window.CustomEvent && !IE11OrLess && !Edge) {
+      evt = new CustomEvent(name, {
+        bubbles: true,
+        cancelable: true
+      });
+    } else {
+      evt = document.createEvent('Event');
+      evt.initEvent(name, true, true);
+    }
+
+    evt.to = toEl || rootEl;
+    evt.from = fromEl || rootEl;
+    evt.item = targetEl || rootEl;
+    evt.clone = cloneEl;
+    evt.oldIndex = oldIndex;
+    evt.newIndex = newIndex;
+    evt.oldDraggableIndex = oldDraggableIndex;
+    evt.newDraggableIndex = newDraggableIndex;
+    evt.originalEvent = originalEvent;
+    evt.pullMode = putSortable ? putSortable.lastPutMode : undefined;
+
+    var allEventProperties = _objectSpread({}, extraEventProperties, PluginManager.getEventProperties(name, sortable));
+
+    for (var option in allEventProperties) {
+      evt[option] = allEventProperties[option];
+    }
+
+    if (rootEl) {
+      rootEl.dispatchEvent(evt);
+    }
+
+    if (options[onName]) {
+      options[onName].call(sortable, evt);
+    }
+  }
+
+  var pluginEvent = function pluginEvent(eventName, sortable) {
+    var _ref = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
+        originalEvent = _ref.evt,
+        data = _objectWithoutProperties(_ref, ["evt"]);
+
+    PluginManager.pluginEvent.bind(Sortable)(eventName, sortable, _objectSpread({
+      dragEl: dragEl,
+      parentEl: parentEl,
+      ghostEl: ghostEl,
+      rootEl: rootEl,
+      nextEl: nextEl,
+      lastDownEl: lastDownEl,
+      cloneEl: cloneEl,
+      cloneHidden: cloneHidden,
+      dragStarted: moved,
+      putSortable: putSortable,
+      activeSortable: Sortable.active,
+      originalEvent: originalEvent,
+      oldIndex: oldIndex,
+      oldDraggableIndex: oldDraggableIndex,
+      newIndex: newIndex,
+      newDraggableIndex: newDraggableIndex,
+      hideGhostForTarget: _hideGhostForTarget,
+      unhideGhostForTarget: _unhideGhostForTarget,
+      cloneNowHidden: function cloneNowHidden() {
+        cloneHidden = true;
+      },
+      cloneNowShown: function cloneNowShown() {
+        cloneHidden = false;
+      },
+      dispatchSortableEvent: function dispatchSortableEvent(name) {
+        _dispatchEvent({
+          sortable: sortable,
+          name: name,
+          originalEvent: originalEvent
+        });
+      }
+    }, data));
+  };
+
+  function _dispatchEvent(info) {
+    dispatchEvent(_objectSpread({
+      putSortable: putSortable,
+      cloneEl: cloneEl,
+      targetEl: dragEl,
+      rootEl: rootEl,
+      oldIndex: oldIndex,
+      oldDraggableIndex: oldDraggableIndex,
+      newIndex: newIndex,
+      newDraggableIndex: newDraggableIndex
+    }, info));
+  }
+
+  var dragEl,
+      parentEl,
+      ghostEl,
+      rootEl,
+      nextEl,
+      lastDownEl,
+      cloneEl,
+      cloneHidden,
+      oldIndex,
+      newIndex,
+      oldDraggableIndex,
+      newDraggableIndex,
+      activeGroup,
+      putSortable,
+      awaitingDragStarted = false,
+      ignoreNextClick = false,
+      sortables = [],
+      tapEvt,
+      touchEvt,
+      lastDx,
+      lastDy,
+      tapDistanceLeft,
+      tapDistanceTop,
+      moved,
+      lastTarget,
+      lastDirection,
+      pastFirstInvertThresh = false,
+      isCircumstantialInvert = false,
+      targetMoveDistance,
+      // For positioning ghost absolutely
+  ghostRelativeParent,
+      ghostRelativeParentInitialScroll = [],
+      // (left, top)
+  _silent = false,
+      savedInputChecked = [];
+  /** @const */
+
+  var documentExists = typeof document !== 'undefined',
+      PositionGhostAbsolutely = IOS,
+      CSSFloatProperty = Edge || IE11OrLess ? 'cssFloat' : 'float',
+      // This will not pass for IE9, because IE9 DnD only works on anchors
+  supportDraggable = documentExists && !ChromeForAndroid && !IOS && 'draggable' in document.createElement('div'),
+      supportCssPointerEvents = function () {
+    if (!documentExists) return; // false when <= IE11
+
+    if (IE11OrLess) {
+      return false;
+    }
+
+    var el = document.createElement('x');
+    el.style.cssText = 'pointer-events:auto';
+    return el.style.pointerEvents === 'auto';
+  }(),
+      _detectDirection = function _detectDirection(el, options) {
+    var elCSS = css(el),
+        elWidth = parseInt(elCSS.width) - parseInt(elCSS.paddingLeft) - parseInt(elCSS.paddingRight) - parseInt(elCSS.borderLeftWidth) - parseInt(elCSS.borderRightWidth),
+        child1 = getChild(el, 0, options),
+        child2 = getChild(el, 1, options),
+        firstChildCSS = child1 && css(child1),
+        secondChildCSS = child2 && css(child2),
+        firstChildWidth = firstChildCSS && parseInt(firstChildCSS.marginLeft) + parseInt(firstChildCSS.marginRight) + getRect(child1).width,
+        secondChildWidth = secondChildCSS && parseInt(secondChildCSS.marginLeft) + parseInt(secondChildCSS.marginRight) + getRect(child2).width;
+
+    if (elCSS.display === 'flex') {
+      return elCSS.flexDirection === 'column' || elCSS.flexDirection === 'column-reverse' ? 'vertical' : 'horizontal';
+    }
+
+    if (elCSS.display === 'grid') {
+      return elCSS.gridTemplateColumns.split(' ').length <= 1 ? 'vertical' : 'horizontal';
+    }
+
+    if (child1 && firstChildCSS["float"] && firstChildCSS["float"] !== 'none') {
+      var touchingSideChild2 = firstChildCSS["float"] === 'left' ? 'left' : 'right';
+      return child2 && (secondChildCSS.clear === 'both' || secondChildCSS.clear === touchingSideChild2) ? 'vertical' : 'horizontal';
+    }
+
+    return child1 && (firstChildCSS.display === 'block' || firstChildCSS.display === 'flex' || firstChildCSS.display === 'table' || firstChildCSS.display === 'grid' || firstChildWidth >= elWidth && elCSS[CSSFloatProperty] === 'none' || child2 && elCSS[CSSFloatProperty] === 'none' && firstChildWidth + secondChildWidth > elWidth) ? 'vertical' : 'horizontal';
+  },
+      _dragElInRowColumn = function _dragElInRowColumn(dragRect, targetRect, vertical) {
+    var dragElS1Opp = vertical ? dragRect.left : dragRect.top,
+        dragElS2Opp = vertical ? dragRect.right : dragRect.bottom,
+        dragElOppLength = vertical ? dragRect.width : dragRect.height,
+        targetS1Opp = vertical ? targetRect.left : targetRect.top,
+        targetS2Opp = vertical ? targetRect.right : targetRect.bottom,
+        targetOppLength = vertical ? targetRect.width : targetRect.height;
+    return dragElS1Opp === targetS1Opp || dragElS2Opp === targetS2Opp || dragElS1Opp + dragElOppLength / 2 === targetS1Opp + targetOppLength / 2;
+  },
+
+  /**
+   * Detects first nearest empty sortable to X and Y position using emptyInsertThreshold.
+   * @param  {Number} x      X position
+   * @param  {Number} y      Y position
+   * @return {HTMLElement}   Element of the first found nearest Sortable
+   */
+  _detectNearestEmptySortable = function _detectNearestEmptySortable(x, y) {
+    var ret;
+    sortables.some(function (sortable) {
+      if (lastChild(sortable)) return;
+      var rect = getRect(sortable),
+          threshold = sortable[expando].options.emptyInsertThreshold,
+          insideHorizontally = x >= rect.left - threshold && x <= rect.right + threshold,
+          insideVertically = y >= rect.top - threshold && y <= rect.bottom + threshold;
+
+      if (threshold && insideHorizontally && insideVertically) {
+        return ret = sortable;
+      }
+    });
+    return ret;
+  },
+      _prepareGroup = function _prepareGroup(options) {
+    function toFn(value, pull) {
+      return function (to, from, dragEl, evt) {
+        var sameGroup = to.options.group.name && from.options.group.name && to.options.group.name === from.options.group.name;
+
+        if (value == null && (pull || sameGroup)) {
+          // Default pull value
+          // Default pull and put value if same group
+          return true;
+        } else if (value == null || value === false) {
+          return false;
+        } else if (pull && value === 'clone') {
+          return value;
+        } else if (typeof value === 'function') {
+          return toFn(value(to, from, dragEl, evt), pull)(to, from, dragEl, evt);
+        } else {
+          var otherGroup = (pull ? to : from).options.group.name;
+          return value === true || typeof value === 'string' && value === otherGroup || value.join && value.indexOf(otherGroup) > -1;
+        }
+      };
+    }
+
+    var group = {};
+    var originalGroup = options.group;
+
+    if (!originalGroup || _typeof(originalGroup) != 'object') {
+      originalGroup = {
+        name: originalGroup
+      };
+    }
+
+    group.name = originalGroup.name;
+    group.checkPull = toFn(originalGroup.pull, true);
+    group.checkPut = toFn(originalGroup.put);
+    group.revertClone = originalGroup.revertClone;
+    options.group = group;
+  },
+      _hideGhostForTarget = function _hideGhostForTarget() {
+    if (!supportCssPointerEvents && ghostEl) {
+      css(ghostEl, 'display', 'none');
+    }
+  },
+      _unhideGhostForTarget = function _unhideGhostForTarget() {
+    if (!supportCssPointerEvents && ghostEl) {
+      css(ghostEl, 'display', '');
+    }
+  }; // #1184 fix - Prevent click event on fallback if dragged but item not changed position
+
+
+  if (documentExists) {
+    document.addEventListener('click', function (evt) {
+      if (ignoreNextClick) {
+        evt.preventDefault();
+        evt.stopPropagation && evt.stopPropagation();
+        evt.stopImmediatePropagation && evt.stopImmediatePropagation();
+        ignoreNextClick = false;
+        return false;
+      }
+    }, true);
+  }
+
+  var nearestEmptyInsertDetectEvent = function nearestEmptyInsertDetectEvent(evt) {
+    if (dragEl) {
+      evt = evt.touches ? evt.touches[0] : evt;
+
+      var nearest = _detectNearestEmptySortable(evt.clientX, evt.clientY);
+
+      if (nearest) {
+        // Create imitation event
+        var event = {};
+
+        for (var i in evt) {
+          if (evt.hasOwnProperty(i)) {
+            event[i] = evt[i];
+          }
+        }
+
+        event.target = event.rootEl = nearest;
+        event.preventDefault = void 0;
+        event.stopPropagation = void 0;
+
+        nearest[expando]._onDragOver(event);
+      }
+    }
+  };
+
+  var _checkOutsideTargetEl = function _checkOutsideTargetEl(evt) {
+    if (dragEl) {
+      dragEl.parentNode[expando]._isOutsideThisEl(evt.target);
+    }
+  };
+  /**
+   * @class  Sortable
+   * @param  {HTMLElement}  el
+   * @param  {Object}       [options]
+   */
+
+
+  function Sortable(el, options) {
+    if (!(el && el.nodeType && el.nodeType === 1)) {
+      throw "Sortable: `el` must be an HTMLElement, not ".concat({}.toString.call(el));
+    }
+
+    this.el = el; // root element
+
+    this.options = options = _extends({}, options); // Export instance
+
+    el[expando] = this;
+    var defaults = {
+      group: null,
+      sort: true,
+      disabled: false,
+      store: null,
+      handle: null,
+      draggable: /^[uo]l$/i.test(el.nodeName) ? '>li' : '>*',
+      swapThreshold: 1,
+      // percentage; 0 <= x <= 1
+      invertSwap: false,
+      // invert always
+      invertedSwapThreshold: null,
+      // will be set to same as swapThreshold if default
+      removeCloneOnHide: true,
+      direction: function direction() {
+        return _detectDirection(el, this.options);
+      },
+      ghostClass: 'sortable-ghost',
+      chosenClass: 'sortable-chosen',
+      dragClass: 'sortable-drag',
+      ignore: 'a, img',
+      filter: null,
+      preventOnFilter: true,
+      animation: 0,
+      easing: null,
+      setData: function setData(dataTransfer, dragEl) {
+        dataTransfer.setData('Text', dragEl.textContent);
+      },
+      dropBubble: false,
+      dragoverBubble: false,
+      dataIdAttr: 'data-id',
+      delay: 0,
+      delayOnTouchOnly: false,
+      touchStartThreshold: (Number.parseInt ? Number : window).parseInt(window.devicePixelRatio, 10) || 1,
+      forceFallback: false,
+      fallbackClass: 'sortable-fallback',
+      fallbackOnBody: false,
+      fallbackTolerance: 0,
+      fallbackOffset: {
+        x: 0,
+        y: 0
+      },
+      supportPointer: Sortable.supportPointer !== false && 'PointerEvent' in window,
+      emptyInsertThreshold: 5
+    };
+    PluginManager.initializePlugins(this, el, defaults); // Set default options
+
+    for (var name in defaults) {
+      !(name in options) && (options[name] = defaults[name]);
+    }
+
+    _prepareGroup(options); // Bind all private methods
+
+
+    for (var fn in this) {
+      if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
+        this[fn] = this[fn].bind(this);
+      }
+    } // Setup drag mode
+
+
+    this.nativeDraggable = options.forceFallback ? false : supportDraggable;
+
+    if (this.nativeDraggable) {
+      // Touch start threshold cannot be greater than the native dragstart threshold
+      this.options.touchStartThreshold = 1;
+    } // Bind events
+
+
+    if (options.supportPointer) {
+      on(el, 'pointerdown', this._onTapStart);
+    } else {
+      on(el, 'mousedown', this._onTapStart);
+      on(el, 'touchstart', this._onTapStart);
+    }
+
+    if (this.nativeDraggable) {
+      on(el, 'dragover', this);
+      on(el, 'dragenter', this);
+    }
+
+    sortables.push(this.el); // Restore sorting
+
+    options.store && options.store.get && this.sort(options.store.get(this) || []); // Add animation state manager
+
+    _extends(this, AnimationStateManager());
+  }
+
+  Sortable.prototype =
+  /** @lends Sortable.prototype */
+  {
+    constructor: Sortable,
+    _isOutsideThisEl: function _isOutsideThisEl(target) {
+      if (!this.el.contains(target) && target !== this.el) {
+        lastTarget = null;
+      }
+    },
+    _getDirection: function _getDirection(evt, target) {
+      return typeof this.options.direction === 'function' ? this.options.direction.call(this, evt, target, dragEl) : this.options.direction;
+    },
+    _onTapStart: function _onTapStart(
+    /** Event|TouchEvent */
+    evt) {
+      if (!evt.cancelable) return;
+
+      var _this = this,
+          el = this.el,
+          options = this.options,
+          preventOnFilter = options.preventOnFilter,
+          type = evt.type,
+          touch = evt.touches && evt.touches[0] || evt.pointerType && evt.pointerType === 'touch' && evt,
+          target = (touch || evt).target,
+          originalTarget = evt.target.shadowRoot && (evt.path && evt.path[0] || evt.composedPath && evt.composedPath()[0]) || target,
+          filter = options.filter;
+
+      _saveInputCheckedState(el); // Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.
+
+
+      if (dragEl) {
+        return;
+      }
+
+      if (/mousedown|pointerdown/.test(type) && evt.button !== 0 || options.disabled) {
+        return; // only left button and enabled
+      } // cancel dnd if original target is content editable
+
+
+      if (originalTarget.isContentEditable) {
+        return;
+      }
+
+      target = closest(target, options.draggable, el, false);
+
+      if (target && target.animated) {
+        return;
+      }
+
+      if (lastDownEl === target) {
+        // Ignoring duplicate `down`
+        return;
+      } // Get the index of the dragged element within its parent
+
+
+      oldIndex = index(target);
+      oldDraggableIndex = index(target, options.draggable); // Check filter
+
+      if (typeof filter === 'function') {
+        if (filter.call(this, evt, target, this)) {
+          _dispatchEvent({
+            sortable: _this,
+            rootEl: originalTarget,
+            name: 'filter',
+            targetEl: target,
+            toEl: el,
+            fromEl: el
+          });
+
+          pluginEvent('filter', _this, {
+            evt: evt
+          });
+          preventOnFilter && evt.cancelable && evt.preventDefault();
+          return; // cancel dnd
+        }
+      } else if (filter) {
+        filter = filter.split(',').some(function (criteria) {
+          criteria = closest(originalTarget, criteria.trim(), el, false);
+
+          if (criteria) {
+            _dispatchEvent({
+              sortable: _this,
+              rootEl: criteria,
+              name: 'filter',
+              targetEl: target,
+              fromEl: el,
+              toEl: el
+            });
+
+            pluginEvent('filter', _this, {
+              evt: evt
+            });
+            return true;
+          }
+        });
+
+        if (filter) {
+          preventOnFilter && evt.cancelable && evt.preventDefault();
+          return; // cancel dnd
+        }
+      }
+
+      if (options.handle && !closest(originalTarget, options.handle, el, false)) {
+        return;
+      } // Prepare `dragstart`
+
+
+      this._prepareDragStart(evt, touch, target);
+    },
+    _prepareDragStart: function _prepareDragStart(
+    /** Event */
+    evt,
+    /** Touch */
+    touch,
+    /** HTMLElement */
+    target) {
+      var _this = this,
+          el = _this.el,
+          options = _this.options,
+          ownerDocument = el.ownerDocument,
+          dragStartFn;
+
+      if (target && !dragEl && target.parentNode === el) {
+        var dragRect = getRect(target);
+        rootEl = el;
+        dragEl = target;
+        parentEl = dragEl.parentNode;
+        nextEl = dragEl.nextSibling;
+        lastDownEl = target;
+        activeGroup = options.group;
+        Sortable.dragged = dragEl;
+        tapEvt = {
+          target: dragEl,
+          clientX: (touch || evt).clientX,
+          clientY: (touch || evt).clientY
+        };
+        tapDistanceLeft = tapEvt.clientX - dragRect.left;
+        tapDistanceTop = tapEvt.clientY - dragRect.top;
+        this._lastX = (touch || evt).clientX;
+        this._lastY = (touch || evt).clientY;
+        dragEl.style['will-change'] = 'all';
+
+        dragStartFn = function dragStartFn() {
+          pluginEvent('delayEnded', _this, {
+            evt: evt
+          });
+
+          if (Sortable.eventCanceled) {
+            _this._onDrop();
+
+            return;
+          } // Delayed drag has been triggered
+          // we can re-enable the events: touchmove/mousemove
+
+
+          _this._disableDelayedDragEvents();
+
+          if (!FireFox && _this.nativeDraggable) {
+            dragEl.draggable = true;
+          } // Bind the events: dragstart/dragend
+
+
+          _this._triggerDragStart(evt, touch); // Drag start event
+
+
+          _dispatchEvent({
+            sortable: _this,
+            name: 'choose',
+            originalEvent: evt
+          }); // Chosen item
+
+
+          toggleClass(dragEl, options.chosenClass, true);
+        }; // Disable "draggable"
+
+
+        options.ignore.split(',').forEach(function (criteria) {
+          find(dragEl, criteria.trim(), _disableDraggable);
+        });
+        on(ownerDocument, 'dragover', nearestEmptyInsertDetectEvent);
+        on(ownerDocument, 'mousemove', nearestEmptyInsertDetectEvent);
+        on(ownerDocument, 'touchmove', nearestEmptyInsertDetectEvent);
+        on(ownerDocument, 'mouseup', _this._onDrop);
+        on(ownerDocument, 'touchend', _this._onDrop);
+        on(ownerDocument, 'touchcancel', _this._onDrop); // Make dragEl draggable (must be before delay for FireFox)
+
+        if (FireFox && this.nativeDraggable) {
+          this.options.touchStartThreshold = 4;
+          dragEl.draggable = true;
+        }
+
+        pluginEvent('delayStart', this, {
+          evt: evt
+        }); // Delay is impossible for native DnD in Edge or IE
+
+        if (options.delay && (!options.delayOnTouchOnly || touch) && (!this.nativeDraggable || !(Edge || IE11OrLess))) {
+          if (Sortable.eventCanceled) {
+            this._onDrop();
+
+            return;
+          } // If the user moves the pointer or let go the click or touch
+          // before the delay has been reached:
+          // disable the delayed drag
+
+
+          on(ownerDocument, 'mouseup', _this._disableDelayedDrag);
+          on(ownerDocument, 'touchend', _this._disableDelayedDrag);
+          on(ownerDocument, 'touchcancel', _this._disableDelayedDrag);
+          on(ownerDocument, 'mousemove', _this._delayedDragTouchMoveHandler);
+          on(ownerDocument, 'touchmove', _this._delayedDragTouchMoveHandler);
+          options.supportPointer && on(ownerDocument, 'pointermove', _this._delayedDragTouchMoveHandler);
+          _this._dragStartTimer = setTimeout(dragStartFn, options.delay);
+        } else {
+          dragStartFn();
+        }
+      }
+    },
+    _delayedDragTouchMoveHandler: function _delayedDragTouchMoveHandler(
+    /** TouchEvent|PointerEvent **/
+    e) {
+      var touch = e.touches ? e.touches[0] : e;
+
+      if (Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(touch.clientY - this._lastY)) >= Math.floor(this.options.touchStartThreshold / (this.nativeDraggable && window.devicePixelRatio || 1))) {
+        this._disableDelayedDrag();
+      }
+    },
+    _disableDelayedDrag: function _disableDelayedDrag() {
+      dragEl && _disableDraggable(dragEl);
+      clearTimeout(this._dragStartTimer);
+
+      this._disableDelayedDragEvents();
+    },
+    _disableDelayedDragEvents: function _disableDelayedDragEvents() {
+      var ownerDocument = this.el.ownerDocument;
+      off(ownerDocument, 'mouseup', this._disableDelayedDrag);
+      off(ownerDocument, 'touchend', this._disableDelayedDrag);
+      off(ownerDocument, 'touchcancel', this._disableDelayedDrag);
+      off(ownerDocument, 'mousemove', this._delayedDragTouchMoveHandler);
+      off(ownerDocument, 'touchmove', this._delayedDragTouchMoveHandler);
+      off(ownerDocument, 'pointermove', this._delayedDragTouchMoveHandler);
+    },
+    _triggerDragStart: function _triggerDragStart(
+    /** Event */
+    evt,
+    /** Touch */
+    touch) {
+      touch = touch || evt.pointerType == 'touch' && evt;
+
+      if (!this.nativeDraggable || touch) {
+        if (this.options.supportPointer) {
+          on(document, 'pointermove', this._onTouchMove);
+        } else if (touch) {
+          on(document, 'touchmove', this._onTouchMove);
+        } else {
+          on(document, 'mousemove', this._onTouchMove);
+        }
+      } else {
+        on(dragEl, 'dragend', this);
+        on(rootEl, 'dragstart', this._onDragStart);
+      }
+
+      try {
+        if (document.selection) {
+          // Timeout neccessary for IE9
+          _nextTick(function () {
+            document.selection.empty();
+          });
+        } else {
+          window.getSelection().removeAllRanges();
+        }
+      } catch (err) {}
+    },
+    _dragStarted: function _dragStarted(fallback, evt) {
+
+      awaitingDragStarted = false;
+
+      if (rootEl && dragEl) {
+        pluginEvent('dragStarted', this, {
+          evt: evt
+        });
+
+        if (this.nativeDraggable) {
+          on(document, 'dragover', _checkOutsideTargetEl);
+        }
+
+        var options = this.options; // Apply effect
+
+        !fallback && toggleClass(dragEl, options.dragClass, false);
+        toggleClass(dragEl, options.ghostClass, true);
+        Sortable.active = this;
+        fallback && this._appendGhost(); // Drag start event
+
+        _dispatchEvent({
+          sortable: this,
+          name: 'start',
+          originalEvent: evt
+        });
+      } else {
+        this._nulling();
+      }
+    },
+    _emulateDragOver: function _emulateDragOver() {
+      if (touchEvt) {
+        this._lastX = touchEvt.clientX;
+        this._lastY = touchEvt.clientY;
+
+        _hideGhostForTarget();
+
+        var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
+        var parent = target;
+
+        while (target && target.shadowRoot) {
+          target = target.shadowRoot.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
+          if (target === parent) break;
+          parent = target;
+        }
+
+        dragEl.parentNode[expando]._isOutsideThisEl(target);
+
+        if (parent) {
+          do {
+            if (parent[expando]) {
+              var inserted = void 0;
+              inserted = parent[expando]._onDragOver({
+                clientX: touchEvt.clientX,
+                clientY: touchEvt.clientY,
+                target: target,
+                rootEl: parent
+              });
+
+              if (inserted && !this.options.dragoverBubble) {
+                break;
+              }
+            }
+
+            target = parent; // store last element
+          }
+          /* jshint boss:true */
+          while (parent = parent.parentNode);
+        }
+
+        _unhideGhostForTarget();
+      }
+    },
+    _onTouchMove: function _onTouchMove(
+    /**TouchEvent*/
+    evt) {
+      if (tapEvt) {
+        var options = this.options,
+            fallbackTolerance = options.fallbackTolerance,
+            fallbackOffset = options.fallbackOffset,
+            touch = evt.touches ? evt.touches[0] : evt,
+            ghostMatrix = ghostEl && matrix(ghostEl, true),
+            scaleX = ghostEl && ghostMatrix && ghostMatrix.a,
+            scaleY = ghostEl && ghostMatrix && ghostMatrix.d,
+            relativeScrollOffset = PositionGhostAbsolutely && ghostRelativeParent && getRelativeScrollOffset(ghostRelativeParent),
+            dx = (touch.clientX - tapEvt.clientX + fallbackOffset.x) / (scaleX || 1) + (relativeScrollOffset ? relativeScrollOffset[0] - ghostRelativeParentInitialScroll[0] : 0) / (scaleX || 1),
+            dy = (touch.clientY - tapEvt.clientY + fallbackOffset.y) / (scaleY || 1) + (relativeScrollOffset ? relativeScrollOffset[1] - ghostRelativeParentInitialScroll[1] : 0) / (scaleY || 1); // only set the status to dragging, when we are actually dragging
+
+        if (!Sortable.active && !awaitingDragStarted) {
+          if (fallbackTolerance && Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(touch.clientY - this._lastY)) < fallbackTolerance) {
+            return;
+          }
+
+          this._onDragStart(evt, true);
+        }
+
+        if (ghostEl) {
+          if (ghostMatrix) {
+            ghostMatrix.e += dx - (lastDx || 0);
+            ghostMatrix.f += dy - (lastDy || 0);
+          } else {
+            ghostMatrix = {
+              a: 1,
+              b: 0,
+              c: 0,
+              d: 1,
+              e: dx,
+              f: dy
+            };
+          }
+
+          var cssMatrix = "matrix(".concat(ghostMatrix.a, ",").concat(ghostMatrix.b, ",").concat(ghostMatrix.c, ",").concat(ghostMatrix.d, ",").concat(ghostMatrix.e, ",").concat(ghostMatrix.f, ")");
+          css(ghostEl, 'webkitTransform', cssMatrix);
+          css(ghostEl, 'mozTransform', cssMatrix);
+          css(ghostEl, 'msTransform', cssMatrix);
+          css(ghostEl, 'transform', cssMatrix);
+          lastDx = dx;
+          lastDy = dy;
+          touchEvt = touch;
+        }
+
+        evt.cancelable && evt.preventDefault();
+      }
+    },
+    _appendGhost: function _appendGhost() {
+      // Bug if using scale(): https://stackoverflow.com/questions/2637058
+      // Not being adjusted for
+      if (!ghostEl) {
+        var container = this.options.fallbackOnBody ? document.body : rootEl,
+            rect = getRect(dragEl, true, PositionGhostAbsolutely, true, container),
+            options = this.options; // Position absolutely
+
+        if (PositionGhostAbsolutely) {
+          // Get relatively positioned parent
+          ghostRelativeParent = container;
+
+          while (css(ghostRelativeParent, 'position') === 'static' && css(ghostRelativeParent, 'transform') === 'none' && ghostRelativeParent !== document) {
+            ghostRelativeParent = ghostRelativeParent.parentNode;
+          }
+
+          if (ghostRelativeParent !== document.body && ghostRelativeParent !== document.documentElement) {
+            if (ghostRelativeParent === document) ghostRelativeParent = getWindowScrollingElement();
+            rect.top += ghostRelativeParent.scrollTop;
+            rect.left += ghostRelativeParent.scrollLeft;
+          } else {
+            ghostRelativeParent = getWindowScrollingElement();
+          }
+
+          ghostRelativeParentInitialScroll = getRelativeScrollOffset(ghostRelativeParent);
+        }
+
+        ghostEl = dragEl.cloneNode(true);
+        toggleClass(ghostEl, options.ghostClass, false);
+        toggleClass(ghostEl, options.fallbackClass, true);
+        toggleClass(ghostEl, options.dragClass, true);
+        css(ghostEl, 'transition', '');
+        css(ghostEl, 'transform', '');
+        css(ghostEl, 'box-sizing', 'border-box');
+        css(ghostEl, 'margin', 0);
+        css(ghostEl, 'top', rect.top);
+        css(ghostEl, 'left', rect.left);
+        css(ghostEl, 'width', rect.width);
+        css(ghostEl, 'height', rect.height);
+        css(ghostEl, 'opacity', '0.8');
+        css(ghostEl, 'position', PositionGhostAbsolutely ? 'absolute' : 'fixed');
+        css(ghostEl, 'zIndex', '100000');
+        css(ghostEl, 'pointerEvents', 'none');
+        Sortable.ghost = ghostEl;
+        container.appendChild(ghostEl); // Set transform-origin
+
+        css(ghostEl, 'transform-origin', tapDistanceLeft / parseInt(ghostEl.style.width) * 100 + '% ' + tapDistanceTop / parseInt(ghostEl.style.height) * 100 + '%');
+      }
+    },
+    _onDragStart: function _onDragStart(
+    /**Event*/
+    evt,
+    /**boolean*/
+    fallback) {
+      var _this = this;
+
+      var dataTransfer = evt.dataTransfer;
+      var options = _this.options;
+      pluginEvent('dragStart', this, {
+        evt: evt
+      });
+
+      if (Sortable.eventCanceled) {
+        this._onDrop();
+
+        return;
+      }
+
+      pluginEvent('setupClone', this);
+
+      if (!Sortable.eventCanceled) {
+        cloneEl = clone(dragEl);
+        cloneEl.draggable = false;
+        cloneEl.style['will-change'] = '';
+
+        this._hideClone();
+
+        toggleClass(cloneEl, this.options.chosenClass, false);
+        Sortable.clone = cloneEl;
+      } // #1143: IFrame support workaround
+
+
+      _this.cloneId = _nextTick(function () {
+        pluginEvent('clone', _this);
+        if (Sortable.eventCanceled) return;
+
+        if (!_this.options.removeCloneOnHide) {
+          rootEl.insertBefore(cloneEl, dragEl);
+        }
+
+        _this._hideClone();
+
+        _dispatchEvent({
+          sortable: _this,
+          name: 'clone'
+        });
+      });
+      !fallback && toggleClass(dragEl, options.dragClass, true); // Set proper drop events
+
+      if (fallback) {
+        ignoreNextClick = true;
+        _this._loopId = setInterval(_this._emulateDragOver, 50);
+      } else {
+        // Undo what was set in _prepareDragStart before drag started
+        off(document, 'mouseup', _this._onDrop);
+        off(document, 'touchend', _this._onDrop);
+        off(document, 'touchcancel', _this._onDrop);
+
+        if (dataTransfer) {
+          dataTransfer.effectAllowed = 'move';
+          options.setData && options.setData.call(_this, dataTransfer, dragEl);
+        }
+
+        on(document, 'drop', _this); // #1276 fix:
+
+        css(dragEl, 'transform', 'translateZ(0)');
+      }
+
+      awaitingDragStarted = true;
+      _this._dragStartId = _nextTick(_this._dragStarted.bind(_this, fallback, evt));
+      on(document, 'selectstart', _this);
+      moved = true;
+
+      if (Safari) {
+        css(document.body, 'user-select', 'none');
+      }
+    },
+    // Returns true - if no further action is needed (either inserted or another condition)
+    _onDragOver: function _onDragOver(
+    /**Event*/
+    evt) {
+      var el = this.el,
+          target = evt.target,
+          dragRect,
+          targetRect,
+          revert,
+          options = this.options,
+          group = options.group,
+          activeSortable = Sortable.active,
+          isOwner = activeGroup === group,
+          canSort = options.sort,
+          fromSortable = putSortable || activeSortable,
+          vertical,
+          _this = this,
+          completedFired = false;
+
+      if (_silent) return;
+
+      function dragOverEvent(name, extra) {
+        pluginEvent(name, _this, _objectSpread({
+          evt: evt,
+          isOwner: isOwner,
+          axis: vertical ? 'vertical' : 'horizontal',
+          revert: revert,
+          dragRect: dragRect,
+          targetRect: targetRect,
+          canSort: canSort,
+          fromSortable: fromSortable,
+          target: target,
+          completed: completed,
+          onMove: function onMove(target, after) {
+            return _onMove(rootEl, el, dragEl, dragRect, target, getRect(target), evt, after);
+          },
+          changed: changed
+        }, extra));
+      } // Capture animation state
+
+
+      function capture() {
+        dragOverEvent('dragOverAnimationCapture');
+
+        _this.captureAnimationState();
+
+        if (_this !== fromSortable) {
+          fromSortable.captureAnimationState();
+        }
+      } // Return invocation when dragEl is inserted (or completed)
+
+
+      function completed(insertion) {
+        dragOverEvent('dragOverCompleted', {
+          insertion: insertion
+        });
+
+        if (insertion) {
+          // Clones must be hidden before folding animation to capture dragRectAbsolute properly
+          if (isOwner) {
+            activeSortable._hideClone();
+          } else {
+            activeSortable._showClone(_this);
+          }
+
+          if (_this !== fromSortable) {
+            // Set ghost class to new sortable's ghost class
+            toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : activeSortable.options.ghostClass, false);
+            toggleClass(dragEl, options.ghostClass, true);
+          }
+
+          if (putSortable !== _this && _this !== Sortable.active) {
+            putSortable = _this;
+          } else if (_this === Sortable.active && putSortable) {
+            putSortable = null;
+          } // Animation
+
+
+          if (fromSortable === _this) {
+            _this._ignoreWhileAnimating = target;
+          }
+
+          _this.animateAll(function () {
+            dragOverEvent('dragOverAnimationComplete');
+            _this._ignoreWhileAnimating = null;
+          });
+
+          if (_this !== fromSortable) {
+            fromSortable.animateAll();
+            fromSortable._ignoreWhileAnimating = null;
+          }
+        } // Null lastTarget if it is not inside a previously swapped element
+
+
+        if (target === dragEl && !dragEl.animated || target === el && !target.animated) {
+          lastTarget = null;
+        } // no bubbling and not fallback
+
+
+        if (!options.dragoverBubble && !evt.rootEl && target !== document) {
+          dragEl.parentNode[expando]._isOutsideThisEl(evt.target); // Do not detect for empty insert if already inserted
+
+
+          !insertion && nearestEmptyInsertDetectEvent(evt);
+        }
+
+        !options.dragoverBubble && evt.stopPropagation && evt.stopPropagation();
+        return completedFired = true;
+      } // Call when dragEl has been inserted
+
+
+      function changed() {
+        newIndex = index(dragEl);
+        newDraggableIndex = index(dragEl, options.draggable);
+
+        _dispatchEvent({
+          sortable: _this,
+          name: 'change',
+          toEl: el,
+          newIndex: newIndex,
+          newDraggableIndex: newDraggableIndex,
+          originalEvent: evt
+        });
+      }
+
+      if (evt.preventDefault !== void 0) {
+        evt.cancelable && evt.preventDefault();
+      }
+
+      target = closest(target, options.draggable, el, true);
+      dragOverEvent('dragOver');
+      if (Sortable.eventCanceled) return completedFired;
+
+      if (dragEl.contains(evt.target) || target.animated && target.animatingX && target.animatingY || _this._ignoreWhileAnimating === target) {
+        return completed(false);
+      }
+
+      ignoreNextClick = false;
+
+      if (activeSortable && !options.disabled && (isOwner ? canSort || (revert = !rootEl.contains(dragEl)) // Reverting item into the original list
+      : putSortable === this || (this.lastPutMode = activeGroup.checkPull(this, activeSortable, dragEl, evt)) && group.checkPut(this, activeSortable, dragEl, evt))) {
+        vertical = this._getDirection(evt, target) === 'vertical';
+        dragRect = getRect(dragEl);
+        dragOverEvent('dragOverValid');
+        if (Sortable.eventCanceled) return completedFired;
+
+        if (revert) {
+          parentEl = rootEl; // actualization
+
+          capture();
+
+          this._hideClone();
+
+          dragOverEvent('revert');
+
+          if (!Sortable.eventCanceled) {
+            if (nextEl) {
+              rootEl.insertBefore(dragEl, nextEl);
+            } else {
+              rootEl.appendChild(dragEl);
+            }
+          }
+
+          return completed(true);
+        }
+
+        var elLastChild = lastChild(el, options.draggable);
+
+        if (!elLastChild || _ghostIsLast(evt, vertical, this) && !elLastChild.animated) {
+          // If already at end of list: Do not insert
+          if (elLastChild === dragEl) {
+            return completed(false);
+          } // assign target only if condition is true
+
+
+          if (elLastChild && el === evt.target) {
+            target = elLastChild;
+          }
+
+          if (target) {
+            targetRect = getRect(target);
+          }
+
+          if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, !!target) !== false) {
+            capture();
+            el.appendChild(dragEl);
+            parentEl = el; // actualization
+
+            changed();
+            return completed(true);
+          }
+        } else if (target.parentNode === el) {
+          targetRect = getRect(target);
+          var direction = 0,
+              targetBeforeFirstSwap,
+              differentLevel = dragEl.parentNode !== el,
+              differentRowCol = !_dragElInRowColumn(dragEl.animated && dragEl.toRect || dragRect, target.animated && target.toRect || targetRect, vertical),
+              side1 = vertical ? 'top' : 'left',
+              scrolledPastTop = isScrolledPast(target, 'top', 'top') || isScrolledPast(dragEl, 'top', 'top'),
+              scrollBefore = scrolledPastTop ? scrolledPastTop.scrollTop : void 0;
+
+          if (lastTarget !== target) {
+            targetBeforeFirstSwap = targetRect[side1];
+            pastFirstInvertThresh = false;
+            isCircumstantialInvert = !differentRowCol && options.invertSwap || differentLevel;
+          }
+
+          direction = _getSwapDirection(evt, target, targetRect, vertical, differentRowCol ? 1 : options.swapThreshold, options.invertedSwapThreshold == null ? options.swapThreshold : options.invertedSwapThreshold, isCircumstantialInvert, lastTarget === target);
+          var sibling;
+
+          if (direction !== 0) {
+            // Check if target is beside dragEl in respective direction (ignoring hidden elements)
+            var dragIndex = index(dragEl);
+
+            do {
+              dragIndex -= direction;
+              sibling = parentEl.children[dragIndex];
+            } while (sibling && (css(sibling, 'display') === 'none' || sibling === ghostEl));
+          } // If dragEl is already beside target: Do not insert
+
+
+          if (direction === 0 || sibling === target) {
+            return completed(false);
+          }
+
+          lastTarget = target;
+          lastDirection = direction;
+          var nextSibling = target.nextElementSibling,
+              after = false;
+          after = direction === 1;
+
+          var moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, after);
+
+          if (moveVector !== false) {
+            if (moveVector === 1 || moveVector === -1) {
+              after = moveVector === 1;
+            }
+
+            _silent = true;
+            setTimeout(_unsilent, 30);
+            capture();
+
+            if (after && !nextSibling) {
+              el.appendChild(dragEl);
+            } else {
+              target.parentNode.insertBefore(dragEl, after ? nextSibling : target);
+            } // Undo chrome's scroll adjustment (has no effect on other browsers)
+
+
+            if (scrolledPastTop) {
+              scrollBy(scrolledPastTop, 0, scrollBefore - scrolledPastTop.scrollTop);
+            }
+
+            parentEl = dragEl.parentNode; // actualization
+            // must be done before animation
+
+            if (targetBeforeFirstSwap !== undefined && !isCircumstantialInvert) {
+              targetMoveDistance = Math.abs(targetBeforeFirstSwap - getRect(target)[side1]);
+            }
+
+            changed();
+            return completed(true);
+          }
+        }
+
+        if (el.contains(dragEl)) {
+          return completed(false);
+        }
+      }
+
+      return false;
+    },
+    _ignoreWhileAnimating: null,
+    _offMoveEvents: function _offMoveEvents() {
+      off(document, 'mousemove', this._onTouchMove);
+      off(document, 'touchmove', this._onTouchMove);
+      off(document, 'pointermove', this._onTouchMove);
+      off(document, 'dragover', nearestEmptyInsertDetectEvent);
+      off(document, 'mousemove', nearestEmptyInsertDetectEvent);
+      off(document, 'touchmove', nearestEmptyInsertDetectEvent);
+    },
+    _offUpEvents: function _offUpEvents() {
+      var ownerDocument = this.el.ownerDocument;
+      off(ownerDocument, 'mouseup', this._onDrop);
+      off(ownerDocument, 'touchend', this._onDrop);
+      off(ownerDocument, 'pointerup', this._onDrop);
+      off(ownerDocument, 'touchcancel', this._onDrop);
+      off(document, 'selectstart', this);
+    },
+    _onDrop: function _onDrop(
+    /**Event*/
+    evt) {
+      var el = this.el,
+          options = this.options; // Get the index of the dragged element within its parent
+
+      newIndex = index(dragEl);
+      newDraggableIndex = index(dragEl, options.draggable);
+      pluginEvent('drop', this, {
+        evt: evt
+      });
+      parentEl = dragEl && dragEl.parentNode; // Get again after plugin event
+
+      newIndex = index(dragEl);
+      newDraggableIndex = index(dragEl, options.draggable);
+
+      if (Sortable.eventCanceled) {
+        this._nulling();
+
+        return;
+      }
+
+      awaitingDragStarted = false;
+      isCircumstantialInvert = false;
+      pastFirstInvertThresh = false;
+      clearInterval(this._loopId);
+      clearTimeout(this._dragStartTimer);
+
+      _cancelNextTick(this.cloneId);
+
+      _cancelNextTick(this._dragStartId); // Unbind events
+
+
+      if (this.nativeDraggable) {
+        off(document, 'drop', this);
+        off(el, 'dragstart', this._onDragStart);
+      }
+
+      this._offMoveEvents();
+
+      this._offUpEvents();
+
+      if (Safari) {
+        css(document.body, 'user-select', '');
+      }
+
+      css(dragEl, 'transform', '');
+
+      if (evt) {
+        if (moved) {
+          evt.cancelable && evt.preventDefault();
+          !options.dropBubble && evt.stopPropagation();
+        }
+
+        ghostEl && ghostEl.parentNode && ghostEl.parentNode.removeChild(ghostEl);
+
+        if (rootEl === parentEl || putSortable && putSortable.lastPutMode !== 'clone') {
+          // Remove clone(s)
+          cloneEl && cloneEl.parentNode && cloneEl.parentNode.removeChild(cloneEl);
+        }
+
+        if (dragEl) {
+          if (this.nativeDraggable) {
+            off(dragEl, 'dragend', this);
+          }
+
+          _disableDraggable(dragEl);
+
+          dragEl.style['will-change'] = ''; // Remove classes
+          // ghostClass is added in dragStarted
+
+          if (moved && !awaitingDragStarted) {
+            toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : this.options.ghostClass, false);
+          }
+
+          toggleClass(dragEl, this.options.chosenClass, false); // Drag stop event
+
+          _dispatchEvent({
+            sortable: this,
+            name: 'unchoose',
+            toEl: parentEl,
+            newIndex: null,
+            newDraggableIndex: null,
+            originalEvent: evt
+          });
+
+          if (rootEl !== parentEl) {
+            if (newIndex >= 0) {
+              // Add event
+              _dispatchEvent({
+                rootEl: parentEl,
+                name: 'add',
+                toEl: parentEl,
+                fromEl: rootEl,
+                originalEvent: evt
+              }); // Remove event
+
+
+              _dispatchEvent({
+                sortable: this,
+                name: 'remove',
+                toEl: parentEl,
+                originalEvent: evt
+              }); // drag from one list and drop into another
+
+
+              _dispatchEvent({
+                rootEl: parentEl,
+                name: 'sort',
+                toEl: parentEl,
+                fromEl: rootEl,
+                originalEvent: evt
+              });
+
+              _dispatchEvent({
+                sortable: this,
+                name: 'sort',
+                toEl: parentEl,
+                originalEvent: evt
+              });
+            }
+
+            putSortable && putSortable.save();
+          } else {
+            if (newIndex !== oldIndex) {
+              if (newIndex >= 0) {
+                // drag & drop within the same list
+                _dispatchEvent({
+                  sortable: this,
+                  name: 'update',
+                  toEl: parentEl,
+                  originalEvent: evt
+                });
+
+                _dispatchEvent({
+                  sortable: this,
+                  name: 'sort',
+                  toEl: parentEl,
+                  originalEvent: evt
+                });
+              }
+            }
+          }
+
+          if (Sortable.active) {
+            /* jshint eqnull:true */
+            if (newIndex == null || newIndex === -1) {
+              newIndex = oldIndex;
+              newDraggableIndex = oldDraggableIndex;
+            }
+
+            _dispatchEvent({
+              sortable: this,
+              name: 'end',
+              toEl: parentEl,
+              originalEvent: evt
+            }); // Save sorting
+
+
+            this.save();
+          }
+        }
+      }
+
+      this._nulling();
+    },
+    _nulling: function _nulling() {
+      pluginEvent('nulling', this);
+      rootEl = dragEl = parentEl = ghostEl = nextEl = cloneEl = lastDownEl = cloneHidden = tapEvt = touchEvt = moved = newIndex = newDraggableIndex = oldIndex = oldDraggableIndex = lastTarget = lastDirection = putSortable = activeGroup = Sortable.dragged = Sortable.ghost = Sortable.clone = Sortable.active = null;
+      savedInputChecked.forEach(function (el) {
+        el.checked = true;
+      });
+      savedInputChecked.length = lastDx = lastDy = 0;
+    },
+    handleEvent: function handleEvent(
+    /**Event*/
+    evt) {
+      switch (evt.type) {
+        case 'drop':
+        case 'dragend':
+          this._onDrop(evt);
+
+          break;
+
+        case 'dragenter':
+        case 'dragover':
+          if (dragEl) {
+            this._onDragOver(evt);
+
+            _globalDragOver(evt);
+          }
+
+          break;
+
+        case 'selectstart':
+          evt.preventDefault();
+          break;
+      }
+    },
+
+    /**
+     * Serializes the item into an array of string.
+     * @returns {String[]}
+     */
+    toArray: function toArray() {
+      var order = [],
+          el,
+          children = this.el.children,
+          i = 0,
+          n = children.length,
+          options = this.options;
+
+      for (; i < n; i++) {
+        el = children[i];
+
+        if (closest(el, options.draggable, this.el, false)) {
+          order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
+        }
+      }
+
+      return order;
+    },
+
+    /**
+     * Sorts the elements according to the array.
+     * @param  {String[]}  order  order of the items
+     */
+    sort: function sort(order) {
+      var items = {},
+          rootEl = this.el;
+      this.toArray().forEach(function (id, i) {
+        var el = rootEl.children[i];
+
+        if (closest(el, this.options.draggable, rootEl, false)) {
+          items[id] = el;
+        }
+      }, this);
+      order.forEach(function (id) {
+        if (items[id]) {
+          rootEl.removeChild(items[id]);
+          rootEl.appendChild(items[id]);
+        }
+      });
+    },
+
+    /**
+     * Save the current sorting
+     */
+    save: function save() {
+      var store = this.options.store;
+      store && store.set && store.set(this);
+    },
+
+    /**
+     * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
+     * @param   {HTMLElement}  el
+     * @param   {String}       [selector]  default: `options.draggable`
+     * @returns {HTMLElement|null}
+     */
+    closest: function closest$1(el, selector) {
+      return closest(el, selector || this.options.draggable, this.el, false);
+    },
+
+    /**
+     * Set/get option
+     * @param   {string} name
+     * @param   {*}      [value]
+     * @returns {*}
+     */
+    option: function option(name, value) {
+      var options = this.options;
+
+      if (value === void 0) {
+        return options[name];
+      } else {
+        var modifiedValue = PluginManager.modifyOption(this, name, value);
+
+        if (typeof modifiedValue !== 'undefined') {
+          options[name] = modifiedValue;
+        } else {
+          options[name] = value;
+        }
+
+        if (name === 'group') {
+          _prepareGroup(options);
+        }
+      }
+    },
+
+    /**
+     * Destroy
+     */
+    destroy: function destroy() {
+      pluginEvent('destroy', this);
+      var el = this.el;
+      el[expando] = null;
+      off(el, 'mousedown', this._onTapStart);
+      off(el, 'touchstart', this._onTapStart);
+      off(el, 'pointerdown', this._onTapStart);
+
+      if (this.nativeDraggable) {
+        off(el, 'dragover', this);
+        off(el, 'dragenter', this);
+      } // Remove draggable attributes
+
+
+      Array.prototype.forEach.call(el.querySelectorAll('[draggable]'), function (el) {
+        el.removeAttribute('draggable');
+      });
+
+      this._onDrop();
+
+      this._disableDelayedDragEvents();
+
+      sortables.splice(sortables.indexOf(this.el), 1);
+      this.el = el = null;
+    },
+    _hideClone: function _hideClone() {
+      if (!cloneHidden) {
+        pluginEvent('hideClone', this);
+        if (Sortable.eventCanceled) return;
+        css(cloneEl, 'display', 'none');
+
+        if (this.options.removeCloneOnHide && cloneEl.parentNode) {
+          cloneEl.parentNode.removeChild(cloneEl);
+        }
+
+        cloneHidden = true;
+      }
+    },
+    _showClone: function _showClone(putSortable) {
+      if (putSortable.lastPutMode !== 'clone') {
+        this._hideClone();
+
+        return;
+      }
+
+      if (cloneHidden) {
+        pluginEvent('showClone', this);
+        if (Sortable.eventCanceled) return; // show clone at dragEl or original position
+
+        if (rootEl.contains(dragEl) && !this.options.group.revertClone) {
+          rootEl.insertBefore(cloneEl, dragEl);
+        } else if (nextEl) {
+          rootEl.insertBefore(cloneEl, nextEl);
+        } else {
+          rootEl.appendChild(cloneEl);
+        }
+
+        if (this.options.group.revertClone) {
+          this.animate(dragEl, cloneEl);
+        }
+
+        css(cloneEl, 'display', '');
+        cloneHidden = false;
+      }
+    }
+  };
+
+  function _globalDragOver(
+  /**Event*/
+  evt) {
+    if (evt.dataTransfer) {
+      evt.dataTransfer.dropEffect = 'move';
+    }
+
+    evt.cancelable && evt.preventDefault();
+  }
+
+  function _onMove(fromEl, toEl, dragEl, dragRect, targetEl, targetRect, originalEvent, willInsertAfter) {
+    var evt,
+        sortable = fromEl[expando],
+        onMoveFn = sortable.options.onMove,
+        retVal; // Support for new CustomEvent feature
+
+    if (window.CustomEvent && !IE11OrLess && !Edge) {
+      evt = new CustomEvent('move', {
+        bubbles: true,
+        cancelable: true
+      });
+    } else {
+      evt = document.createEvent('Event');
+      evt.initEvent('move', true, true);
+    }
+
+    evt.to = toEl;
+    evt.from = fromEl;
+    evt.dragged = dragEl;
+    evt.draggedRect = dragRect;
+    evt.related = targetEl || toEl;
+    evt.relatedRect = targetRect || getRect(toEl);
+    evt.willInsertAfter = willInsertAfter;
+    evt.originalEvent = originalEvent;
+    fromEl.dispatchEvent(evt);
+
+    if (onMoveFn) {
+      retVal = onMoveFn.call(sortable, evt, originalEvent);
+    }
+
+    return retVal;
+  }
+
+  function _disableDraggable(el) {
+    el.draggable = false;
+  }
+
+  function _unsilent() {
+    _silent = false;
+  }
+
+  function _ghostIsLast(evt, vertical, sortable) {
+    var rect = getRect(lastChild(sortable.el, sortable.options.draggable));
+    var spacer = 10;
+    return vertical ? evt.clientX > rect.right + spacer || evt.clientX <= rect.right && evt.clientY > rect.bottom && evt.clientX >= rect.left : evt.clientX > rect.right && evt.clientY > rect.top || evt.clientX <= rect.right && evt.clientY > rect.bottom + spacer;
+  }
+
+  function _getSwapDirection(evt, target, targetRect, vertical, swapThreshold, invertedSwapThreshold, invertSwap, isLastTarget) {
+    var mouseOnAxis = vertical ? evt.clientY : evt.clientX,
+        targetLength = vertical ? targetRect.height : targetRect.width,
+        targetS1 = vertical ? targetRect.top : targetRect.left,
+        targetS2 = vertical ? targetRect.bottom : targetRect.right,
+        invert = false;
+
+    if (!invertSwap) {
+      // Never invert or create dragEl shadow when target movemenet causes mouse to move past the end of regular swapThreshold
+      if (isLastTarget && targetMoveDistance < targetLength * swapThreshold) {
+        // multiplied only by swapThreshold because mouse will already be inside target by (1 - threshold) * targetLength / 2
+        // check if past first invert threshold on side opposite of lastDirection
+        if (!pastFirstInvertThresh && (lastDirection === 1 ? mouseOnAxis > targetS1 + targetLength * invertedSwapThreshold / 2 : mouseOnAxis < targetS2 - targetLength * invertedSwapThreshold / 2)) {
+          // past first invert threshold, do not restrict inverted threshold to dragEl shadow
+          pastFirstInvertThresh = true;
+        }
+
+        if (!pastFirstInvertThresh) {
+          // dragEl shadow (target move distance shadow)
+          if (lastDirection === 1 ? mouseOnAxis < targetS1 + targetMoveDistance // over dragEl shadow
+          : mouseOnAxis > targetS2 - targetMoveDistance) {
+            return -lastDirection;
+          }
+        } else {
+          invert = true;
+        }
+      } else {
+        // Regular
+        if (mouseOnAxis > targetS1 + targetLength * (1 - swapThreshold) / 2 && mouseOnAxis < targetS2 - targetLength * (1 - swapThreshold) / 2) {
+          return _getInsertDirection(target);
+        }
+      }
+    }
+
+    invert = invert || invertSwap;
+
+    if (invert) {
+      // Invert of regular
+      if (mouseOnAxis < targetS1 + targetLength * invertedSwapThreshold / 2 || mouseOnAxis > targetS2 - targetLength * invertedSwapThreshold / 2) {
+        return mouseOnAxis > targetS1 + targetLength / 2 ? 1 : -1;
+      }
+    }
+
+    return 0;
+  }
+  /**
+   * Gets the direction dragEl must be swapped relative to target in order to make it
+   * seem that dragEl has been "inserted" into that element's position
+   * @param  {HTMLElement} target       The target whose position dragEl is being inserted at
+   * @return {Number}                   Direction dragEl must be swapped
+   */
+
+
+  function _getInsertDirection(target) {
+    if (index(dragEl) < index(target)) {
+      return 1;
+    } else {
+      return -1;
+    }
+  }
+  /**
+   * Generate id
+   * @param   {HTMLElement} el
+   * @returns {String}
+   * @private
+   */
+
+
+  function _generateId(el) {
+    var str = el.tagName + el.className + el.src + el.href + el.textContent,
+        i = str.length,
+        sum = 0;
+
+    while (i--) {
+      sum += str.charCodeAt(i);
+    }
+
+    return sum.toString(36);
+  }
+
+  function _saveInputCheckedState(root) {
+    savedInputChecked.length = 0;
+    var inputs = root.getElementsByTagName('input');
+    var idx = inputs.length;
+
+    while (idx--) {
+      var el = inputs[idx];
+      el.checked && savedInputChecked.push(el);
+    }
+  }
+
+  function _nextTick(fn) {
+    return setTimeout(fn, 0);
+  }
+
+  function _cancelNextTick(id) {
+    return clearTimeout(id);
+  } // Fixed #973:
+
+
+  if (documentExists) {
+    on(document, 'touchmove', function (evt) {
+      if ((Sortable.active || awaitingDragStarted) && evt.cancelable) {
+        evt.preventDefault();
+      }
+    });
+  } // Export utils
+
+
+  Sortable.utils = {
+    on: on,
+    off: off,
+    css: css,
+    find: find,
+    is: function is(el, selector) {
+      return !!closest(el, selector, el, false);
+    },
+    extend: extend,
+    throttle: throttle,
+    closest: closest,
+    toggleClass: toggleClass,
+    clone: clone,
+    index: index,
+    nextTick: _nextTick,
+    cancelNextTick: _cancelNextTick,
+    detectDirection: _detectDirection,
+    getChild: getChild
+  };
+  /**
+   * Get the Sortable instance of an element
+   * @param  {HTMLElement} element The element
+   * @return {Sortable|undefined}         The instance of Sortable
+   */
+
+  Sortable.get = function (element) {
+    return element[expando];
+  };
+  /**
+   * Mount a plugin to Sortable
+   * @param  {...SortablePlugin|SortablePlugin[]} plugins       Plugins being mounted
+   */
+
+
+  Sortable.mount = function () {
+    for (var _len = arguments.length, plugins = new Array(_len), _key = 0; _key < _len; _key++) {
+      plugins[_key] = arguments[_key];
+    }
+
+    if (plugins[0].constructor === Array) plugins = plugins[0];
+    plugins.forEach(function (plugin) {
+      if (!plugin.prototype || !plugin.prototype.constructor) {
+        throw "Sortable: Mounted plugin must be a constructor function, not ".concat({}.toString.call(plugin));
+      }
+
+      if (plugin.utils) Sortable.utils = _objectSpread({}, Sortable.utils, plugin.utils);
+      PluginManager.mount(plugin);
+    });
+  };
+  /**
+   * Create sortable instance
+   * @param {HTMLElement}  el
+   * @param {Object}      [options]
+   */
+
+
+  Sortable.create = function (el, options) {
+    return new Sortable(el, options);
+  }; // Export
+
+
+  Sortable.version = version;
+
+  var autoScrolls = [],
+      scrollEl,
+      scrollRootEl,
+      scrolling = false,
+      lastAutoScrollX,
+      lastAutoScrollY,
+      touchEvt$1,
+      pointerElemChangedInterval;
+
+  function AutoScrollPlugin() {
+    function AutoScroll() {
+      this.defaults = {
+        scroll: true,
+        scrollSensitivity: 30,
+        scrollSpeed: 10,
+        bubbleScroll: true
+      }; // Bind all private methods
+
+      for (var fn in this) {
+        if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
+          this[fn] = this[fn].bind(this);
+        }
+      }
+    }
+
+    AutoScroll.prototype = {
+      dragStarted: function dragStarted(_ref) {
+        var originalEvent = _ref.originalEvent;
+
+        if (this.sortable.nativeDraggable) {
+          on(document, 'dragover', this._handleAutoScroll);
+        } else {
+          if (this.options.supportPointer) {
+            on(document, 'pointermove', this._handleFallbackAutoScroll);
+          } else if (originalEvent.touches) {
+            on(document, 'touchmove', this._handleFallbackAutoScroll);
+          } else {
+            on(document, 'mousemove', this._handleFallbackAutoScroll);
+          }
+        }
+      },
+      dragOverCompleted: function dragOverCompleted(_ref2) {
+        var originalEvent = _ref2.originalEvent;
+
+        // For when bubbling is canceled and using fallback (fallback 'touchmove' always reached)
+        if (!this.options.dragOverBubble && !originalEvent.rootEl) {
+          this._handleAutoScroll(originalEvent);
+        }
+      },
+      drop: function drop() {
+        if (this.sortable.nativeDraggable) {
+          off(document, 'dragover', this._handleAutoScroll);
+        } else {
+          off(document, 'pointermove', this._handleFallbackAutoScroll);
+          off(document, 'touchmove', this._handleFallbackAutoScroll);
+          off(document, 'mousemove', this._handleFallbackAutoScroll);
+        }
+
+        clearPointerElemChangedInterval();
+        clearAutoScrolls();
+        cancelThrottle();
+      },
+      nulling: function nulling() {
+        touchEvt$1 = scrollRootEl = scrollEl = scrolling = pointerElemChangedInterval = lastAutoScrollX = lastAutoScrollY = null;
+        autoScrolls.length = 0;
+      },
+      _handleFallbackAutoScroll: function _handleFallbackAutoScroll(evt) {
+        this._handleAutoScroll(evt, true);
+      },
+      _handleAutoScroll: function _handleAutoScroll(evt, fallback) {
+        var _this = this;
+
+        var x = (evt.touches ? evt.touches[0] : evt).clientX,
+            y = (evt.touches ? evt.touches[0] : evt).clientY,
+            elem = document.elementFromPoint(x, y);
+        touchEvt$1 = evt; // IE does not seem to have native autoscroll,
+        // Edge's autoscroll seems too conditional,
+        // MACOS Safari does not have autoscroll,
+        // Firefox and Chrome are good
+
+        if (fallback || Edge || IE11OrLess || Safari) {
+          autoScroll(evt, this.options, elem, fallback); // Listener for pointer element change
+
+          var ogElemScroller = getParentAutoScrollElement(elem, true);
+
+          if (scrolling && (!pointerElemChangedInterval || x !== lastAutoScrollX || y !== lastAutoScrollY)) {
+            pointerElemChangedInterval && clearPointerElemChangedInterval(); // Detect for pointer elem change, emulating native DnD behaviour
+
+            pointerElemChangedInterval = setInterval(function () {
+              var newElem = getParentAutoScrollElement(document.elementFromPoint(x, y), true);
+
+              if (newElem !== ogElemScroller) {
+                ogElemScroller = newElem;
+                clearAutoScrolls();
+              }
+
+              autoScroll(evt, _this.options, newElem, fallback);
+            }, 10);
+            lastAutoScrollX = x;
+            lastAutoScrollY = y;
+          }
+        } else {
+          // if DnD is enabled (and browser has good autoscrolling), first autoscroll will already scroll, so get parent autoscroll of first autoscroll
+          if (!this.options.bubbleScroll || getParentAutoScrollElement(elem, true) === getWindowScrollingElement()) {
+            clearAutoScrolls();
+            return;
+          }
+
+          autoScroll(evt, this.options, getParentAutoScrollElement(elem, false), false);
+        }
+      }
+    };
+    return _extends(AutoScroll, {
+      pluginName: 'scroll',
+      initializeByDefault: true
+    });
+  }
+
+  function clearAutoScrolls() {
+    autoScrolls.forEach(function (autoScroll) {
+      clearInterval(autoScroll.pid);
+    });
+    autoScrolls = [];
+  }
+
+  function clearPointerElemChangedInterval() {
+    clearInterval(pointerElemChangedInterval);
+  }
+
+  var autoScroll = throttle(function (evt, options, rootEl, isFallback) {
+    // Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
+    if (!options.scroll) return;
+    var x = (evt.touches ? evt.touches[0] : evt).clientX,
+        y = (evt.touches ? evt.touches[0] : evt).clientY,
+        sens = options.scrollSensitivity,
+        speed = options.scrollSpeed,
+        winScroller = getWindowScrollingElement();
+    var scrollThisInstance = false,
+        scrollCustomFn; // New scroll root, set scrollEl
+
+    if (scrollRootEl !== rootEl) {
+      scrollRootEl = rootEl;
+      clearAutoScrolls();
+      scrollEl = options.scroll;
+      scrollCustomFn = options.scrollFn;
+
+      if (scrollEl === true) {
+        scrollEl = getParentAutoScrollElement(rootEl, true);
+      }
+    }
+
+    var layersOut = 0;
+    var currentParent = scrollEl;
+
+    do {
+      var el = currentParent,
+          rect = getRect(el),
+          top = rect.top,
+          bottom = rect.bottom,
+          left = rect.left,
+          right = rect.right,
+          width = rect.width,
+          height = rect.height,
+          canScrollX = void 0,
+          canScrollY = void 0,
+          scrollWidth = el.scrollWidth,
+          scrollHeight = el.scrollHeight,
+          elCSS = css(el),
+          scrollPosX = el.scrollLeft,
+          scrollPosY = el.scrollTop;
+
+      if (el === winScroller) {
+        canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll' || elCSS.overflowX === 'visible');
+        canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll' || elCSS.overflowY === 'visible');
+      } else {
+        canScrollX = width < scrollWidth && (elCSS.overflowX === 'auto' || elCSS.overflowX === 'scroll');
+        canScrollY = height < scrollHeight && (elCSS.overflowY === 'auto' || elCSS.overflowY === 'scroll');
+      }
+
+      var vx = canScrollX && (Math.abs(right - x) <= sens && scrollPosX + width < scrollWidth) - (Math.abs(left - x) <= sens && !!scrollPosX);
+      var vy = canScrollY && (Math.abs(bottom - y) <= sens && scrollPosY + height < scrollHeight) - (Math.abs(top - y) <= sens && !!scrollPosY);
+
+      if (!autoScrolls[layersOut]) {
+        for (var i = 0; i <= layersOut; i++) {
+          if (!autoScrolls[i]) {
+            autoScrolls[i] = {};
+          }
+        }
+      }
+
+      if (autoScrolls[layersOut].vx != vx || autoScrolls[layersOut].vy != vy || autoScrolls[layersOut].el !== el) {
+        autoScrolls[layersOut].el = el;
+        autoScrolls[layersOut].vx = vx;
+        autoScrolls[layersOut].vy = vy;
+        clearInterval(autoScrolls[layersOut].pid);
+
+        if (vx != 0 || vy != 0) {
+          scrollThisInstance = true;
+          /* jshint loopfunc:true */
+
+          autoScrolls[layersOut].pid = setInterval(function () {
+            // emulate drag over during autoscroll (fallback), emulating native DnD behaviour
+            if (isFallback && this.layer === 0) {
+              Sortable.active._onTouchMove(touchEvt$1); // To move ghost if it is positioned absolutely
+
+            }
+
+            var scrollOffsetY = autoScrolls[this.layer].vy ? autoScrolls[this.layer].vy * speed : 0;
+            var scrollOffsetX = autoScrolls[this.layer].vx ? autoScrolls[this.layer].vx * speed : 0;
+
+            if (typeof scrollCustomFn === 'function') {
+              if (scrollCustomFn.call(Sortable.dragged.parentNode[expando], scrollOffsetX, scrollOffsetY, evt, touchEvt$1, autoScrolls[this.layer].el) !== 'continue') {
+                return;
+              }
+            }
+
+            scrollBy(autoScrolls[this.layer].el, scrollOffsetX, scrollOffsetY);
+          }.bind({
+            layer: layersOut
+          }), 24);
+        }
+      }
+
+      layersOut++;
+    } while (options.bubbleScroll && currentParent !== winScroller && (currentParent = getParentAutoScrollElement(currentParent, false)));
+
+    scrolling = scrollThisInstance; // in case another function catches scrolling as false in between when it is not
+  }, 30);
+
+  var drop = function drop(_ref) {
+    var originalEvent = _ref.originalEvent,
+        putSortable = _ref.putSortable,
+        dragEl = _ref.dragEl,
+        activeSortable = _ref.activeSortable,
+        dispatchSortableEvent = _ref.dispatchSortableEvent,
+        hideGhostForTarget = _ref.hideGhostForTarget,
+        unhideGhostForTarget = _ref.unhideGhostForTarget;
+    if (!originalEvent) return;
+    var toSortable = putSortable || activeSortable;
+    hideGhostForTarget();
+    var touch = originalEvent.changedTouches && originalEvent.changedTouches.length ? originalEvent.changedTouches[0] : originalEvent;
+    var target = document.elementFromPoint(touch.clientX, touch.clientY);
+    unhideGhostForTarget();
+
+    if (toSortable && !toSortable.el.contains(target)) {
+      dispatchSortableEvent('spill');
+      this.onSpill({
+        dragEl: dragEl,
+        putSortable: putSortable
+      });
+    }
+  };
+
+  function Revert() {}
+
+  Revert.prototype = {
+    startIndex: null,
+    dragStart: function dragStart(_ref2) {
+      var oldDraggableIndex = _ref2.oldDraggableIndex;
+      this.startIndex = oldDraggableIndex;
+    },
+    onSpill: function onSpill(_ref3) {
+      var dragEl = _ref3.dragEl,
+          putSortable = _ref3.putSortable;
+      this.sortable.captureAnimationState();
+
+      if (putSortable) {
+        putSortable.captureAnimationState();
+      }
+
+      var nextSibling = getChild(this.sortable.el, this.startIndex, this.options);
+
+      if (nextSibling) {
+        this.sortable.el.insertBefore(dragEl, nextSibling);
+      } else {
+        this.sortable.el.appendChild(dragEl);
+      }
+
+      this.sortable.animateAll();
+
+      if (putSortable) {
+        putSortable.animateAll();
+      }
+    },
+    drop: drop
+  };
+
+  _extends(Revert, {
+    pluginName: 'revertOnSpill'
+  });
+
+  function Remove() {}
+
+  Remove.prototype = {
+    onSpill: function onSpill(_ref4) {
+      var dragEl = _ref4.dragEl,
+          putSortable = _ref4.putSortable;
+      var parentSortable = putSortable || this.sortable;
+      parentSortable.captureAnimationState();
+      dragEl.parentNode && dragEl.parentNode.removeChild(dragEl);
+      parentSortable.animateAll();
+    },
+    drop: drop
+  };
+
+  _extends(Remove, {
+    pluginName: 'removeOnSpill'
+  });
+
+  var lastSwapEl;
+
+  function SwapPlugin() {
+    function Swap() {
+      this.defaults = {
+        swapClass: 'sortable-swap-highlight'
+      };
+    }
+
+    Swap.prototype = {
+      dragStart: function dragStart(_ref) {
+        var dragEl = _ref.dragEl;
+        lastSwapEl = dragEl;
+      },
+      dragOverValid: function dragOverValid(_ref2) {
+        var completed = _ref2.completed,
+            target = _ref2.target,
+            onMove = _ref2.onMove,
+            activeSortable = _ref2.activeSortable,
+            changed = _ref2.changed,
+            cancel = _ref2.cancel;
+        if (!activeSortable.options.swap) return;
+        var el = this.sortable.el,
+            options = this.options;
+
+        if (target && target !== el) {
+          var prevSwapEl = lastSwapEl;
+
+          if (onMove(target) !== false) {
+            toggleClass(target, options.swapClass, true);
+            lastSwapEl = target;
+          } else {
+            lastSwapEl = null;
+          }
+
+          if (prevSwapEl && prevSwapEl !== lastSwapEl) {
+            toggleClass(prevSwapEl, options.swapClass, false);
+          }
+        }
+
+        changed();
+        completed(true);
+        cancel();
+      },
+      drop: function drop(_ref3) {
+        var activeSortable = _ref3.activeSortable,
+            putSortable = _ref3.putSortable,
+            dragEl = _ref3.dragEl;
+        var toSortable = putSortable || this.sortable;
+        var options = this.options;
+        lastSwapEl && toggleClass(lastSwapEl, options.swapClass, false);
+
+        if (lastSwapEl && (options.swap || putSortable && putSortable.options.swap)) {
+          if (dragEl !== lastSwapEl) {
+            toSortable.captureAnimationState();
+            if (toSortable !== activeSortable) activeSortable.captureAnimationState();
+            swapNodes(dragEl, lastSwapEl);
+            toSortable.animateAll();
+            if (toSortable !== activeSortable) activeSortable.animateAll();
+          }
+        }
+      },
+      nulling: function nulling() {
+        lastSwapEl = null;
+      }
+    };
+    return _extends(Swap, {
+      pluginName: 'swap',
+      eventProperties: function eventProperties() {
+        return {
+          swapItem: lastSwapEl
+        };
+      }
+    });
+  }
+
+  function swapNodes(n1, n2) {
+    var p1 = n1.parentNode,
+        p2 = n2.parentNode,
+        i1,
+        i2;
+    if (!p1 || !p2 || p1.isEqualNode(n2) || p2.isEqualNode(n1)) return;
+    i1 = index(n1);
+    i2 = index(n2);
+
+    if (p1.isEqualNode(p2) && i1 < i2) {
+      i2++;
+    }
+
+    p1.insertBefore(n2, p1.children[i1]);
+    p2.insertBefore(n1, p2.children[i2]);
+  }
+
+  var multiDragElements = [],
+      multiDragClones = [],
+      lastMultiDragSelect,
+      // for selection with modifier key down (SHIFT)
+  multiDragSortable,
+      initialFolding = false,
+      // Initial multi-drag fold when drag started
+  folding = false,
+      // Folding any other time
+  dragStarted = false,
+      dragEl$1,
+      clonesFromRect,
+      clonesHidden;
+
+  function MultiDragPlugin() {
+    function MultiDrag(sortable) {
+      // Bind all private methods
+      for (var fn in this) {
+        if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
+          this[fn] = this[fn].bind(this);
+        }
+      }
+
+      if (sortable.options.supportPointer) {
+        on(document, 'pointerup', this._deselectMultiDrag);
+      } else {
+        on(document, 'mouseup', this._deselectMultiDrag);
+        on(document, 'touchend', this._deselectMultiDrag);
+      }
+
+      on(document, 'keydown', this._checkKeyDown);
+      on(document, 'keyup', this._checkKeyUp);
+      this.defaults = {
+        selectedClass: 'sortable-selected',
+        multiDragKey: null,
+        setData: function setData(dataTransfer, dragEl) {
+          var data = '';
+
+          if (multiDragElements.length && multiDragSortable === sortable) {
+            multiDragElements.forEach(function (multiDragElement, i) {
+              data += (!i ? '' : ', ') + multiDragElement.textContent;
+            });
+          } else {
+            data = dragEl.textContent;
+          }
+
+          dataTransfer.setData('Text', data);
+        }
+      };
+    }
+
+    MultiDrag.prototype = {
+      multiDragKeyDown: false,
+      isMultiDrag: false,
+      delayStartGlobal: function delayStartGlobal(_ref) {
+        var dragged = _ref.dragEl;
+        dragEl$1 = dragged;
+      },
+      delayEnded: function delayEnded() {
+        this.isMultiDrag = ~multiDragElements.indexOf(dragEl$1);
+      },
+      setupClone: function setupClone(_ref2) {
+        var sortable = _ref2.sortable,
+            cancel = _ref2.cancel;
+        if (!this.isMultiDrag) return;
+
+        for (var i = 0; i < multiDragElements.length; i++) {
+          multiDragClones.push(clone(multiDragElements[i]));
+          multiDragClones[i].sortableIndex = multiDragElements[i].sortableIndex;
+          multiDragClones[i].draggable = false;
+          multiDragClones[i].style['will-change'] = '';
+          toggleClass(multiDragClones[i], this.options.selectedClass, false);
+          multiDragElements[i] === dragEl$1 && toggleClass(multiDragClones[i], this.options.chosenClass, false);
+        }
+
+        sortable._hideClone();
+
+        cancel();
+      },
+      clone: function clone(_ref3) {
+        var sortable = _ref3.sortable,
+            rootEl = _ref3.rootEl,
+            dispatchSortableEvent = _ref3.dispatchSortableEvent,
+            cancel = _ref3.cancel;
+        if (!this.isMultiDrag) return;
+
+        if (!this.options.removeCloneOnHide) {
+          if (multiDragElements.length && multiDragSortable === sortable) {
+            insertMultiDragClones(true, rootEl);
+            dispatchSortableEvent('clone');
+            cancel();
+          }
+        }
+      },
+      showClone: function showClone(_ref4) {
+        var cloneNowShown = _ref4.cloneNowShown,
+            rootEl = _ref4.rootEl,
+            cancel = _ref4.cancel;
+        if (!this.isMultiDrag) return;
+        insertMultiDragClones(false, rootEl);
+        multiDragClones.forEach(function (clone) {
+          css(clone, 'display', '');
+        });
+        cloneNowShown();
+        clonesHidden = false;
+        cancel();
+      },
+      hideClone: function hideClone(_ref5) {
+        var _this = this;
+
+        var sortable = _ref5.sortable,
+            cloneNowHidden = _ref5.cloneNowHidden,
+            cancel = _ref5.cancel;
+        if (!this.isMultiDrag) return;
+        multiDragClones.forEach(function (clone) {
+          css(clone, 'display', 'none');
+
+          if (_this.options.removeCloneOnHide && clone.parentNode) {
+            clone.parentNode.removeChild(clone);
+          }
+        });
+        cloneNowHidden();
+        clonesHidden = true;
+        cancel();
+      },
+      dragStartGlobal: function dragStartGlobal(_ref6) {
+        var sortable = _ref6.sortable;
+
+        if (!this.isMultiDrag && multiDragSortable) {
+          multiDragSortable.multiDrag._deselectMultiDrag();
+        }
+
+        multiDragElements.forEach(function (multiDragElement) {
+          multiDragElement.sortableIndex = index(multiDragElement);
+        }); // Sort multi-drag elements
+
+        multiDragElements = multiDragElements.sort(function (a, b) {
+          return a.sortableIndex - b.sortableIndex;
+        });
+        dragStarted = true;
+      },
+      dragStarted: function dragStarted(_ref7) {
+        var _this2 = this;
+
+        var sortable = _ref7.sortable;
+        if (!this.isMultiDrag) return;
+
+        if (this.options.sort) {
+          // Capture rects,
+          // hide multi drag elements (by positioning them absolute),
+          // set multi drag elements rects to dragRect,
+          // show multi drag elements,
+          // animate to rects,
+          // unset rects & remove from DOM
+          sortable.captureAnimationState();
+
+          if (this.options.animation) {
+            multiDragElements.forEach(function (multiDragElement) {
+              if (multiDragElement === dragEl$1) return;
+              css(multiDragElement, 'position', 'absolute');
+            });
+            var dragRect = getRect(dragEl$1, false, true, true);
+            multiDragElements.forEach(function (multiDragElement) {
+              if (multiDragElement === dragEl$1) return;
+              setRect(multiDragElement, dragRect);
+            });
+            folding = true;
+            initialFolding = true;
+          }
+        }
+
+        sortable.animateAll(function () {
+          folding = false;
+          initialFolding = false;
+
+          if (_this2.options.animation) {
+            multiDragElements.forEach(function (multiDragElement) {
+              unsetRect(multiDragElement);
+            });
+          } // Remove all auxiliary multidrag items from el, if sorting enabled
+
+
+          if (_this2.options.sort) {
+            removeMultiDragElements();
+          }
+        });
+      },
+      dragOver: function dragOver(_ref8) {
+        var target = _ref8.target,
+            completed = _ref8.completed,
+            cancel = _ref8.cancel;
+
+        if (folding && ~multiDragElements.indexOf(target)) {
+          completed(false);
+          cancel();
+        }
+      },
+      revert: function revert(_ref9) {
+        var fromSortable = _ref9.fromSortable,
+            rootEl = _ref9.rootEl,
+            sortable = _ref9.sortable,
+            dragRect = _ref9.dragRect;
+
+        if (multiDragElements.length > 1) {
+          // Setup unfold animation
+          multiDragElements.forEach(function (multiDragElement) {
+            sortable.addAnimationState({
+              target: multiDragElement,
+              rect: folding ? getRect(multiDragElement) : dragRect
+            });
+            unsetRect(multiDragElement);
+            multiDragElement.fromRect = dragRect;
+            fromSortable.removeAnimationState(multiDragElement);
+          });
+          folding = false;
+          insertMultiDragElements(!this.options.removeCloneOnHide, rootEl);
+        }
+      },
+      dragOverCompleted: function dragOverCompleted(_ref10) {
+        var sortable = _ref10.sortable,
+            isOwner = _ref10.isOwner,
+            insertion = _ref10.insertion,
+            activeSortable = _ref10.activeSortable,
+            parentEl = _ref10.parentEl,
+            putSortable = _ref10.putSortable;
+        var options = this.options;
+
+        if (insertion) {
+          // Clones must be hidden before folding animation to capture dragRectAbsolute properly
+          if (isOwner) {
+            activeSortable._hideClone();
+          }
+
+          initialFolding = false; // If leaving sort:false root, or already folding - Fold to new location
+
+          if (options.animation && multiDragElements.length > 1 && (folding || !isOwner && !activeSortable.options.sort && !putSortable)) {
+            // Fold: Set all multi drag elements's rects to dragEl's rect when multi-drag elements are invisible
+            var dragRectAbsolute = getRect(dragEl$1, false, true, true);
+            multiDragElements.forEach(function (multiDragElement) {
+              if (multiDragElement === dragEl$1) return;
+              setRect(multiDragElement, dragRectAbsolute); // Move element(s) to end of parentEl so that it does not interfere with multi-drag clones insertion if they are inserted
+              // while folding, and so that we can capture them again because old sortable will no longer be fromSortable
+
+              parentEl.appendChild(multiDragElement);
+            });
+            folding = true;
+          } // Clones must be shown (and check to remove multi drags) after folding when interfering multiDragElements are moved out
+
+
+          if (!isOwner) {
+            // Only remove if not folding (folding will remove them anyways)
+            if (!folding) {
+              removeMultiDragElements();
+            }
+
+            if (multiDragElements.length > 1) {
+              var clonesHiddenBefore = clonesHidden;
+
+              activeSortable._showClone(sortable); // Unfold animation for clones if showing from hidden
+
+
+              if (activeSortable.options.animation && !clonesHidden && clonesHiddenBefore) {
+                multiDragClones.forEach(function (clone) {
+                  activeSortable.addAnimationState({
+                    target: clone,
+                    rect: clonesFromRect
+                  });
+                  clone.fromRect = clonesFromRect;
+                  clone.thisAnimationDuration = null;
+                });
+              }
+            } else {
+              activeSortable._showClone(sortable);
+            }
+          }
+        }
+      },
+      dragOverAnimationCapture: function dragOverAnimationCapture(_ref11) {
+        var dragRect = _ref11.dragRect,
+            isOwner = _ref11.isOwner,
+            activeSortable = _ref11.activeSortable;
+        multiDragElements.forEach(function (multiDragElement) {
+          multiDragElement.thisAnimationDuration = null;
+        });
+
+        if (activeSortable.options.animation && !isOwner && activeSortable.multiDrag.isMultiDrag) {
+          clonesFromRect = _extends({}, dragRect);
+          var dragMatrix = matrix(dragEl$1, true);
+          clonesFromRect.top -= dragMatrix.f;
+          clonesFromRect.left -= dragMatrix.e;
+        }
+      },
+      dragOverAnimationComplete: function dragOverAnimationComplete() {
+        if (folding) {
+          folding = false;
+          removeMultiDragElements();
+        }
+      },
+      drop: function drop(_ref12) {
+        var evt = _ref12.originalEvent,
+            rootEl = _ref12.rootEl,
+            parentEl = _ref12.parentEl,
+            sortable = _ref12.sortable,
+            dispatchSortableEvent = _ref12.dispatchSortableEvent,
+            oldIndex = _ref12.oldIndex,
+            putSortable = _ref12.putSortable;
+        var toSortable = putSortable || this.sortable;
+        if (!evt) return;
+        var options = this.options,
+            children = parentEl.children; // Multi-drag selection
+
+        if (!dragStarted) {
+          if (options.multiDragKey && !this.multiDragKeyDown) {
+            this._deselectMultiDrag();
+          }
+
+          toggleClass(dragEl$1, options.selectedClass, !~multiDragElements.indexOf(dragEl$1));
+
+          if (!~multiDragElements.indexOf(dragEl$1)) {
+            multiDragElements.push(dragEl$1);
+            dispatchEvent({
+              sortable: sortable,
+              rootEl: rootEl,
+              name: 'select',
+              targetEl: dragEl$1,
+              originalEvt: evt
+            }); // Modifier activated, select from last to dragEl
+
+            if (evt.shiftKey && lastMultiDragSelect && sortable.el.contains(lastMultiDragSelect)) {
+              var lastIndex = index(lastMultiDragSelect),
+                  currentIndex = index(dragEl$1);
+
+              if (~lastIndex && ~currentIndex && lastIndex !== currentIndex) {
+                // Must include lastMultiDragSelect (select it), in case modified selection from no selection
+                // (but previous selection existed)
+                var n, i;
+
+                if (currentIndex > lastIndex) {
+                  i = lastIndex;
+                  n = currentIndex;
+                } else {
+                  i = currentIndex;
+                  n = lastIndex + 1;
+                }
+
+                for (; i < n; i++) {
+                  if (~multiDragElements.indexOf(children[i])) continue;
+                  toggleClass(children[i], options.selectedClass, true);
+                  multiDragElements.push(children[i]);
+                  dispatchEvent({
+                    sortable: sortable,
+                    rootEl: rootEl,
+                    name: 'select',
+                    targetEl: children[i],
+                    originalEvt: evt
+                  });
+                }
+              }
+            } else {
+              lastMultiDragSelect = dragEl$1;
+            }
+
+            multiDragSortable = toSortable;
+          } else {
+            multiDragElements.splice(multiDragElements.indexOf(dragEl$1), 1);
+            lastMultiDragSelect = null;
+            dispatchEvent({
+              sortable: sortable,
+              rootEl: rootEl,
+              name: 'deselect',
+              targetEl: dragEl$1,
+              originalEvt: evt
+            });
+          }
+        } // Multi-drag drop
+
+
+        if (dragStarted && this.isMultiDrag) {
+          // Do not "unfold" after around dragEl if reverted
+          if ((parentEl[expando].options.sort || parentEl !== rootEl) && multiDragElements.length > 1) {
+            var dragRect = getRect(dragEl$1),
+                multiDragIndex = index(dragEl$1, ':not(.' + this.options.selectedClass + ')');
+            if (!initialFolding && options.animation) dragEl$1.thisAnimationDuration = null;
+            toSortable.captureAnimationState();
+
+            if (!initialFolding) {
+              if (options.animation) {
+                dragEl$1.fromRect = dragRect;
+                multiDragElements.forEach(function (multiDragElement) {
+                  multiDragElement.thisAnimationDuration = null;
+
+                  if (multiDragElement !== dragEl$1) {
+                    var rect = folding ? getRect(multiDragElement) : dragRect;
+                    multiDragElement.fromRect = rect; // Prepare unfold animation
+
+                    toSortable.addAnimationState({
+                      target: multiDragElement,
+                      rect: rect
+                    });
+                  }
+                });
+              } // Multi drag elements are not necessarily removed from the DOM on drop, so to reinsert
+              // properly they must all be removed
+
+
+              removeMultiDragElements();
+              multiDragElements.forEach(function (multiDragElement) {
+                if (children[multiDragIndex]) {
+                  parentEl.insertBefore(multiDragElement, children[multiDragIndex]);
+                } else {
+                  parentEl.appendChild(multiDragElement);
+                }
+
+                multiDragIndex++;
+              }); // If initial folding is done, the elements may have changed position because they are now
+              // unfolding around dragEl, even though dragEl may not have his index changed, so update event
+              // must be fired here as Sortable will not.
+
+              if (oldIndex === index(dragEl$1)) {
+                var update = false;
+                multiDragElements.forEach(function (multiDragElement) {
+                  if (multiDragElement.sortableIndex !== index(multiDragElement)) {
+                    update = true;
+                    return;
+                  }
+                });
+
+                if (update) {
+                  dispatchSortableEvent('update');
+                }
+              }
+            } // Must be done after capturing individual rects (scroll bar)
+
+
+            multiDragElements.forEach(function (multiDragElement) {
+              unsetRect(multiDragElement);
+            });
+            toSortable.animateAll();
+          }
+
+          multiDragSortable = toSortable;
+        } // Remove clones if necessary
+
+
+        if (rootEl === parentEl || putSortable && putSortable.lastPutMode !== 'clone') {
+          multiDragClones.forEach(function (clone) {
+            clone.parentNode && clone.parentNode.removeChild(clone);
+          });
+        }
+      },
+      nullingGlobal: function nullingGlobal() {
+        this.isMultiDrag = dragStarted = false;
+        multiDragClones.length = 0;
+      },
+      destroyGlobal: function destroyGlobal() {
+        this._deselectMultiDrag();
+
+        off(document, 'pointerup', this._deselectMultiDrag);
+        off(document, 'mouseup', this._deselectMultiDrag);
+        off(document, 'touchend', this._deselectMultiDrag);
+        off(document, 'keydown', this._checkKeyDown);
+        off(document, 'keyup', this._checkKeyUp);
+      },
+      _deselectMultiDrag: function _deselectMultiDrag(evt) {
+        if (typeof dragStarted !== "undefined" && dragStarted) return; // Only deselect if selection is in this sortable
+
+        if (multiDragSortable !== this.sortable) return; // Only deselect if target is not item in this sortable
+
+        if (evt && closest(evt.target, this.options.draggable, this.sortable.el, false)) return; // Only deselect if left click
+
+        if (evt && evt.button !== 0) return;
+
+        while (multiDragElements.length) {
+          var el = multiDragElements[0];
+          toggleClass(el, this.options.selectedClass, false);
+          multiDragElements.shift();
+          dispatchEvent({
+            sortable: this.sortable,
+            rootEl: this.sortable.el,
+            name: 'deselect',
+            targetEl: el,
+            originalEvt: evt
+          });
+        }
+      },
+      _checkKeyDown: function _checkKeyDown(evt) {
+        if (evt.key === this.options.multiDragKey) {
+          this.multiDragKeyDown = true;
+        }
+      },
+      _checkKeyUp: function _checkKeyUp(evt) {
+        if (evt.key === this.options.multiDragKey) {
+          this.multiDragKeyDown = false;
+        }
+      }
+    };
+    return _extends(MultiDrag, {
+      // Static methods & properties
+      pluginName: 'multiDrag',
+      utils: {
+        /**
+         * Selects the provided multi-drag item
+         * @param  {HTMLElement} el    The element to be selected
+         */
+        select: function select(el) {
+          var sortable = el.parentNode[expando];
+          if (!sortable || !sortable.options.multiDrag || ~multiDragElements.indexOf(el)) return;
+
+          if (multiDragSortable && multiDragSortable !== sortable) {
+            multiDragSortable.multiDrag._deselectMultiDrag();
+
+            multiDragSortable = sortable;
+          }
+
+          toggleClass(el, sortable.options.selectedClass, true);
+          multiDragElements.push(el);
+        },
+
+        /**
+         * Deselects the provided multi-drag item
+         * @param  {HTMLElement} el    The element to be deselected
+         */
+        deselect: function deselect(el) {
+          var sortable = el.parentNode[expando],
+              index = multiDragElements.indexOf(el);
+          if (!sortable || !sortable.options.multiDrag || !~index) return;
+          toggleClass(el, sortable.options.selectedClass, false);
+          multiDragElements.splice(index, 1);
+        }
+      },
+      eventProperties: function eventProperties() {
+        var _this3 = this;
+
+        var oldIndicies = [],
+            newIndicies = [];
+        multiDragElements.forEach(function (multiDragElement) {
+          oldIndicies.push({
+            multiDragElement: multiDragElement,
+            index: multiDragElement.sortableIndex
+          }); // multiDragElements will already be sorted if folding
+
+          var newIndex;
+
+          if (folding && multiDragElement !== dragEl$1) {
+            newIndex = -1;
+          } else if (folding) {
+            newIndex = index(multiDragElement, ':not(.' + _this3.options.selectedClass + ')');
+          } else {
+            newIndex = index(multiDragElement);
+          }
+
+          newIndicies.push({
+            multiDragElement: multiDragElement,
+            index: newIndex
+          });
+        });
+        return {
+          items: _toConsumableArray(multiDragElements),
+          clones: [].concat(multiDragClones),
+          oldIndicies: oldIndicies,
+          newIndicies: newIndicies
+        };
+      },
+      optionListeners: {
+        multiDragKey: function multiDragKey(key) {
+          key = key.toLowerCase();
+
+          if (key === 'ctrl') {
+            key = 'Control';
+          } else if (key.length > 1) {
+            key = key.charAt(0).toUpperCase() + key.substr(1);
+          }
+
+          return key;
+        }
+      }
+    });
+  }
+
+  function insertMultiDragElements(clonesInserted, rootEl) {
+    multiDragElements.forEach(function (multiDragElement, i) {
+      var target = rootEl.children[multiDragElement.sortableIndex + (clonesInserted ? Number(i) : 0)];
+
+      if (target) {
+        rootEl.insertBefore(multiDragElement, target);
+      } else {
+        rootEl.appendChild(multiDragElement);
+      }
+    });
+  }
+  /**
+   * Insert multi-drag clones
+   * @param  {[Boolean]} elementsInserted  Whether the multi-drag elements are inserted
+   * @param  {HTMLElement} rootEl
+   */
+
+
+  function insertMultiDragClones(elementsInserted, rootEl) {
+    multiDragClones.forEach(function (clone, i) {
+      var target = rootEl.children[clone.sortableIndex + (elementsInserted ? Number(i) : 0)];
+
+      if (target) {
+        rootEl.insertBefore(clone, target);
+      } else {
+        rootEl.appendChild(clone);
+      }
+    });
+  }
+
+  function removeMultiDragElements() {
+    multiDragElements.forEach(function (multiDragElement) {
+      if (multiDragElement === dragEl$1) return;
+      multiDragElement.parentNode && multiDragElement.parentNode.removeChild(multiDragElement);
+    });
+  }
+
+  Sortable.mount(new AutoScrollPlugin());
+  Sortable.mount(Remove, Revert);
+
+  Sortable.mount(new SwapPlugin());
+  Sortable.mount(new MultiDragPlugin());
+
+  return Sortable;
+
+}));
diff --git a/web/src/x.min.js b/web/src/x.min.js
index f8465bf..0b97b1a 100644
--- a/web/src/x.min.js
+++ b/web/src/x.min.js
@@ -4494,6 +4494,7 @@ var X = window.X || {
                             for(let q in d.spaces){
                                 for(let j in d.spaces[q]['children']){
                                     d.spaces[q]['children'][j]['onclick'] = 0;
+                                    d.spaces[q]['children'][j]['sort'] = j
                                     if(j == 0){
                                         d.spaces[q]['children'][j]['onclick'] = 1;
                                     }
@@ -4505,6 +4506,7 @@ var X = window.X || {
                             for(let q in d.spaces){
                                 for(let j in d.spaces[q]['children']){
                                     d.spaces[q]['children'][j]['onclick'] = 0;
+                                    d.spaces[q]['children'][j]['sort'] = j
                                     if(d.spaces[q]['children'][j]['_id'] == X.DATA['dashboard_id']){
                                         d.spaces[q]['children'][j]['onclick'] = 1;
                                         $(".tab-tit-box .tab-tit").html(d.spaces[q]['children'][j]['name']);
@@ -4517,31 +4519,40 @@ var X = window.X || {
                         $("#model-box").html("");
                         // 获取报表数据
                         X.pageLogic['dashboard'].gettabledata();
+                        var sidebar = document.getElementById('sidebar-box');
+                        new Sortable(sidebar, {
+                            handle: '.tuodong', // handle class
+                            animation: 150,
+                            onUpdate:function(evt){
+                                var newIndex = evt.newIndex;
+                                var oldIndex = evt.oldIndex;
+                                // console.log(d.spaces);
+                                for(let j in d.spaces[i]['children']){
+                                    if(j >= newIndex){
+                                        d.spaces[i]['children'][j]['sort'] = Number(d.spaces[i]['children'][j]['sort'])  + Number(1);
+                                    }
+                                }
+                                d.spaces[i]['children'][oldIndex]['sort'] = newIndex;
+                                var sortarr = [];
+                                for(let q in d.spaces[i]['children']){
+                                    var arr = {
+                                        dashboard_id: d.spaces[i]['children'][q]['_id'],
+                                        sort: d.spaces[i]['children'][q]['sort']
+                                    }
+                                    sortarr.push(arr);
+                                }
+                                X.api('dashboard/sort','post',{sort:sortarr},function(d){
+                                    if(d == 1){
+                                        X.pageLogic.dashboard.freshMenu(X.DATA['projectid']);
+                                    }
+                                })
+                            }
+                        });
                         break;//终止循环
+                        
                     }
                 }
                 
-                // var updateOutput = function(e){
-
-                //     var list   = e.length ? e : $(e.target),
-            
-                //         output = list.data('output');
-            
-                //     if (window.JSON) {
-            
-                //         output.val(window.JSON.stringify(list.nestable('serialize')));//, null, 2));
-                //         console.log(list.nestable('serialize'));
-            
-                //     } else {
-            
-                //         output.val('JSON browser support required for this demo.');
-                //         console.log(222);
-                //     }
-            
-                // };
-            
-                // $('#sidebar-box').nestable({group: 1}).on('change', updateOutput);
-                // updateOutput($('#sidebar-box').data('output', $('#nestable-output')));
             });
         },
 
diff --git a/web/srczip/logic/dashboard.js b/web/srczip/logic/dashboard.js
index ad6e5e7..2e1c34d 100644
--- a/web/srczip/logic/dashboard.js
+++ b/web/srczip/logic/dashboard.js
@@ -552,6 +552,7 @@
                             for(let q in d.spaces){
                                 for(let j in d.spaces[q]['children']){
                                     d.spaces[q]['children'][j]['onclick'] = 0;
+                                    d.spaces[q]['children'][j]['sort'] = j
                                     if(j == 0){
                                         d.spaces[q]['children'][j]['onclick'] = 1;
                                     }
@@ -563,6 +564,7 @@
                             for(let q in d.spaces){
                                 for(let j in d.spaces[q]['children']){
                                     d.spaces[q]['children'][j]['onclick'] = 0;
+                                    d.spaces[q]['children'][j]['sort'] = j
                                     if(d.spaces[q]['children'][j]['_id'] == X.DATA['dashboard_id']){
                                         d.spaces[q]['children'][j]['onclick'] = 1;
                                         $(".tab-tit-box .tab-tit").html(d.spaces[q]['children'][j]['name']);
@@ -575,31 +577,40 @@
                         $("#model-box").html("");
                         // 获取报表数据
                         X.pageLogic['dashboard'].gettabledata();
+                        var sidebar = document.getElementById('sidebar-box');
+                        new Sortable(sidebar, {
+                            handle: '.tuodong', // handle class
+                            animation: 150,
+                            onUpdate:function(evt){
+                                var newIndex = evt.newIndex;
+                                var oldIndex = evt.oldIndex;
+                                // console.log(d.spaces);
+                                for(let j in d.spaces[i]['children']){
+                                    if(j >= newIndex){
+                                        d.spaces[i]['children'][j]['sort'] = Number(d.spaces[i]['children'][j]['sort'])  + Number(1);
+                                    }
+                                }
+                                d.spaces[i]['children'][oldIndex]['sort'] = newIndex;
+                                var sortarr = [];
+                                for(let q in d.spaces[i]['children']){
+                                    var arr = {
+                                        dashboard_id: d.spaces[i]['children'][q]['_id'],
+                                        sort: d.spaces[i]['children'][q]['sort']
+                                    }
+                                    sortarr.push(arr);
+                                }
+                                X.api('dashboard/sort','post',{sort:sortarr},function(d){
+                                    if(d == 1){
+                                        X.pageLogic.dashboard.freshMenu(X.DATA['projectid']);
+                                    }
+                                })
+                            }
+                        });
                         break;//终止循环
+                        
                     }
                 }
                 
-                // var updateOutput = function(e){
-
-                //     var list   = e.length ? e : $(e.target),
-            
-                //         output = list.data('output');
-            
-                //     if (window.JSON) {
-            
-                //         output.val(window.JSON.stringify(list.nestable('serialize')));//, null, 2));
-                //         console.log(list.nestable('serialize'));
-            
-                //     } else {
-            
-                //         output.val('JSON browser support required for this demo.');
-                //         console.log(222);
-                //     }
-            
-                // };
-            
-                // $('#sidebar-box').nestable({group: 1}).on('change', updateOutput);
-                // updateOutput($('#sidebar-box').data('output', $('#nestable-output')));
             });
         },