/**
 * 仿element-ui，级联选择器
 * 已实现单选、多选、无关联选择
 * 其他功能：组件禁用、节点禁用、自定义属性、自定义空面板提示，自定义无选择时的提示、多选标签折叠、回显、搜索、动态加载、最大选中数量限制、禁用项固定等操作。
 * element-ui没有的功能：最大选中数量限制、禁用项固定
 * author: yixiaco
 * gitee: https://gitee.com/yixiacoco/lay_cascader
 * github: https://github.com/yixiaco/lay_cascader
 */
layui.define(["jquery"], function (exports) {
  var $ = layui.jquery;

  /**
   * 级联各项节点对象
   * @param data        原始对象信息
   * @param cascader    级联对象
   * @param level       层级，从0开始
   * @param parentNode 父节点对象
   * @constructor
   */
  function Node(data, cascader, level, parentNode) {
    this.data = data;
    this.cascader = cascader;
    this.config = cascader.config;
    this.props = cascader.props;
    this.level = level;
    this.parentNode = parentNode;
    // 引入的icon图标
    this.icons = cascader.icons;
    //该节点是否被选中 0:未选中，1：选中，2：不定
    this._checked = 0;
    // 是否正在加载中
    this._loading = false;
    // 每个Node的唯一标识
    this.nodeId = cascader.data.nodeId++;
  }

  Node.prototype = {
    constructor: Node,
    /** 最顶级父节点 */
    get topParentNode() {
      return !this.parentNode && this || this.topParentNode;
    },
    /** 子节点 */
    childrenNode: undefined,
    get loading() {
      return this._loading;
    },
    set loading(loading) {
      var $li = this.$li;
      if ($li) {
        var rightIcon = this.icons.right;
        var loadingIcon = this.icons.loading;
        var $i = $li.find('i');
        if (loading) {
          $i.addClass(loadingIcon);
          $i.removeClass(rightIcon);
        } else {
          $i.addClass(rightIcon);
          $i.removeClass(loadingIcon);
        }
      }
      return this._loading = loading;
    },
    /** 当前节点的显示文本 */
    get label() {
      return this.data[this.props.label];
    },
    /** 当前节点的值 */
    get value() {
      return this.data[this.props.value];
    },
    /** 是否禁用 */
    get disabled() {
      var multiple = this.props.multiple;
      var maxSize = this.config.maxSize;
      var checkedNodeIds = this.cascader.data.checkedNodeIds;
      var disabledName = this.props.disabled;
      var checkStrictly = this.props.checkStrictly;
      // 检查是否超过最大值限制
      if (multiple && maxSize !== 0) {
        if (checkedNodeIds.length >= maxSize && checkedNodeIds.indexOf(this.nodeId) === -1) {
          // 如果是关联的多选，需要查询叶子节点是否有被选中的项
          if (!checkStrictly) {
            var leafChildren = this.getAllLeafChildren();
            var nodeIds = leafChildren.map(function (value) {
              return value.nodeId
            });
            // 如果叶子节点不包含，则直接返回true
            if (!nodeIds.some(function (nodeId) {
              return checkedNodeIds.indexOf(nodeId) !== -1;
            })) {
              return true;
            }
          } else {
            return true;
          }
        }
      }
      if (!checkStrictly) {
        var path = this.path;
        return path.some(function (node) {
          return node.data[disabledName];
        });
      } else {
        return this.data[disabledName];
      }
    },
    /** 子节点数据 */
    get children() {
      return this.data[this.props.children];
    },
    set children(children) {
      this.data[this.props.children] = children;
    },
    /** 叶子节点 */
    get leaf() {
      var leaf = this.data[this.props.leaf];
      if (typeof leaf === 'boolean') {
        return leaf;
      }
      // 如果children不为空,则判断是否是子节点
      if (this.children) {
        return this.children.length <= 0;
      }
      return true;
    },
    /** 当前单选值 */
    get activeNodeId() {
      return this.cascader.data.activeNodeId;
    },
    /** 当前复选框值 */
    get checkedNodeIds() {
      return this.cascader.data.checkedNodeIds;
    },
    /** 路径 */
    get path() {
      var parentNode = this.parentNode;
      if (parentNode) {
        return parentNode.path.concat([this]);
      } else {
        return [this];
      }
    },
    /** 是否正在搜索中 */
    get isFiltering() {
      return this.cascader.isFiltering;
    },
    /** 输入框的tag标签 */
    get $tag() {
      var cascader = this.cascader;
      var showAllLevels = this.config.showAllLevels;
      var disabled = this.config.disabled;
      var nodeDisabled = this.disabled;
      var disabledFixed = this.config.disabledFixed;

      var label = this.getPathLabel(showAllLevels);
      var $tag = cascader.get$tag(label, !disabled && (!nodeDisabled || !disabledFixed));
      var self = this;
      $tag.find('i').click(function (event) {
        event.stopPropagation();
        self.selectedValue();
        cascader.removeTag(self.value, self);
      });
      return $tag;
    },
    /**
     * 完整路径的标签
     * @param showAllLevels
     * @returns {string}
     */
    getPathLabel: function (showAllLevels) {
      var path = this.path;
      var separator = this.config.separator;

      var label;
      if (showAllLevels) {
        label = path.map(function (node) {
          return node.label;
        }).join(separator);
      } else {
        label = path[path.length - 1].label;
      }
      return label;
    },
    /**
     * 初始化
     */
    init: function () {
      var multiple = this.props.multiple;
      var checkStrictly = this.props.checkStrictly;
      var fromIcon = this.icons.from;
      var rightIcon = this.icons.right;
      var icon = '';
      var label = this.label;
      if (!this.leaf) {
        icon = rightIcon;
      }
      this.$li = $('<li role="menuitem" id="cascader-menu" tabindex="-1" class="el-cascader-node" aria-haspopup="true" aria-owns="cascader-menu"><span class="el-cascader-node__label">' + label + '</span><i class="' + fromIcon + ' ' + icon + '"></i></li>');

      // 节点渲染
      if (!multiple && !checkStrictly) {
        this._renderRadio();
      } else if (!multiple && checkStrictly) {
        this._renderRadioCheckStrictly();
      } else if (multiple && !checkStrictly) {
        this._renderMultiple();
      } else if (multiple && checkStrictly) {
        this._renderMultipleCheckStrictly();
      }
    },
    /**
     * 初始化可搜索li
     */
    initSuggestionLi: function () {
      var label = this.getPathLabel(true);
      this.$suggestionLi = $('<li tabindex="-1" class="el-cascader__suggestion-item"><span>' + label + '</span></li>');
      // 节点渲染
      this._renderFiltering();
    },
    /**
     * 绑定到菜单中
     * @param $list li节点
     */
    bind: function ($list) {
      this.init();
      $list.append(this.$li);
    },
    /**
     * 绑定可搜索到列表中
     * @param $list
     */
    bindSuggestion: function ($list) {
      this.initSuggestionLi();
      $list.append(this.$suggestionLi);
    },
    /**
     * 可搜索渲染
     * @private
     */
    _renderFiltering: function () {
      var $li = this.$suggestionLi;
      var nodeId = this.nodeId;
      var fromIcon = this.icons.from;
      var okIcon = this.icons.ok;
      var self = this;
      var cascader = this.cascader;
      var multiple = this.props.multiple;

      var icon = '<i class="' + fromIcon + ' ' + okIcon + ' el-icon-check"></i>';
      $li.click(function (event) {
        event.stopPropagation();
        self.selectedValue();
        if (multiple) {
          if (self.checkedNodeIds.indexOf(nodeId) === -1) {
            $li.removeClass('is-checked');
            $li.find('.el-icon-check').remove();
          } else {
            $li.addClass('is-checked');
            $li.append(icon);
          }
        } else {
          // 关闭面板
          cascader.close();
        }
      });

      if (multiple && self.checkedNodeIds.indexOf(nodeId) !== -1
        || !multiple && self.activeNodeId === nodeId) {
        $li.addClass('is-checked');
        $li.append(icon)
      }
    },
    /**
     * 单选&&关联
     * @private
     */
    _renderRadio: function () {
      var $li = this.$li;
      var nodeId = this.nodeId;
      var fromIcon = this.icons.from;
      var okIcon = this.icons.ok;
      var level = this.level;
      var leaf = this.leaf;
      var self = this;
      var cascader = this.cascader;
      var activeNode = this.cascader.data.activeNode;
      var parentNode = this.parentNode;

      if (self.activeNodeId && activeNode.path.some(function (node) {
        return node.nodeId === nodeId;
      })) {
        if (self.activeNodeId === nodeId) {
          $li.prepend('<i class="' + fromIcon + ' ' + okIcon + ' el-cascader-node__prefix"></i>');
        }
        $li.addClass('is-active');
        $li.addClass('in-checked-path');
      }

      // 是否禁用
      if (this.disabled) {
        $li.addClass('is-disabled');
        return;
      }

      $li.addClass('is-selectable');

      if (parentNode) {
        parentNode.$li.siblings().removeClass('in-active-path');
        parentNode.$li.addClass('in-active-path');
      }

      // 触发下一个节点
      this._liClick(function (event) {
        event.stopPropagation();
        var childrenNode = self.childrenNode;
        if (leaf && event.type === 'click') {
          self.selectedValue();
          // 关闭面板
          cascader.close();
        }
        // 添加下级菜单
        cascader._appendMenu(childrenNode, level + 1, self);
      });
    },
    /**
     * 单选&&非关联
     * @private
     */
    _renderRadioCheckStrictly: function () {
      var $li = this.$li;
      var nodeId = this.nodeId;
      var level = this.level;
      var leaf = this.leaf;
      var self = this;
      var cascader = this.cascader;
      var activeNode = cascader.data.activeNode;
      var parentNode = this.parentNode;

      $li.addClass('is-selectable');
      // 任意一级单选
      var $radio = $('<label role="radio" tabindex="0" class="el-radio"><span class="el-radio__input"><span class="el-radio__inner"></span><input type="radio" aria-hidden="true" tabindex="-1" class="el-radio__original" value="' + nodeId + '"></span><span class="el-radio__label"><span></span></span></label>');
      this.$radio = $radio;
      $li.prepend($radio);
      if (parentNode) {
        parentNode.$li.siblings().removeClass('in-active-path');
        parentNode.$li.addClass('in-active-path');
      }

      // 触发下一个节点
      this._liClick(function (event) {
        event.stopPropagation();
        var childrenNode = self.childrenNode;
        if (!self.disabled && leaf && event.type === 'click') {
          self.selectedValue();
        }
        // 添加下级菜单
        cascader._appendMenu(childrenNode, level + 1, self);
      });

      if (self.activeNodeId && activeNode.path.some(function (node) {
        return node.nodeId === nodeId;
      })) {
        if (self.activeNodeId === nodeId) {
          $radio.find('.el-radio__input').addClass('is-checked');
        }
        $li.addClass('is-active');
        $li.addClass('in-checked-path');
      }

      if (this.disabled) {
        $radio.addClass('is-disabled');
        $radio.find('.el-radio__input').addClass('is-disabled');
        return;
      }
      // 选中事件
      $radio.click(function (event) {
        event.preventDefault();
        !leaf && self.selectedValue();
      });
    },
    /**
     * 多选&&关联
     * @private
     */
    _renderMultiple: function () {
      var $li = this.$li;
      var level = this.level;
      var leaf = this.leaf;
      var self = this;
      var cascader = this.cascader;
      var checked = this._checked;
      var parentNode = this.parentNode;

      $li.addClass('el-cascader-node');

      // 多选框
      var $checked = $('<label class="el-checkbox"><span class="el-checkbox__input"><span class="el-checkbox__inner"></span><input type="checkbox" aria-hidden="false" class="el-checkbox__original" value=""></span></label>');
      this.$checked = $checked;
      $li.prepend($checked);

      // 渲染
      if (checked === 1) {
        this.$checked.find('.el-checkbox__input').addClass('is-checked');
      } else if (checked === 2) {
        this.$checked.find('.el-checkbox__input').addClass('is-indeterminate');
      }

      if (parentNode) {
        parentNode.$li.siblings().removeClass('in-active-path');
        parentNode.$li.addClass('in-active-path');
      }

      // 触发下一个节点
      this._liClick(function (event) {
        event.stopPropagation();
        var childrenNode = self.childrenNode;
        if (!self.disabled && leaf && event.type === 'click') {
          // 最后一级就默认选择
          self.selectedValue();
        }
        // 添加下级菜单
        cascader._appendMenu(childrenNode, level + 1, self);
      });

      if (this.disabled) {
        $li.addClass('is-disabled');
        $checked.addClass('is-disabled');
        $checked.find('.el-checkbox__input').addClass('is-disabled');
        return;
      }

      // 选中事件
      $checked.click(function (event) {
        event.preventDefault();
        if (!leaf) {
          var childrenNode = self.childrenNode;
          self.selectedValue();
          cascader._appendMenu(childrenNode, level + 1, self);
        }
      });
    },
    /**
     * 多选&&非关联
     * @private
     */
    _renderMultipleCheckStrictly: function () {
      var $li = this.$li;
      var level = this.level;
      var leaf = this.leaf;
      var self = this;
      var cascader = this.cascader;
      var checkedNodeIds = cascader.data.checkedNodeIds;
      var checkedNodes = cascader.data.checkedNodes;
      var nodeId = this.nodeId;
      var parentNode = this.parentNode;

      $li.addClass('el-cascader-node is-selectable');

      // 多选框
      var $checked = $('<label class="el-checkbox"><span class="el-checkbox__input"><span class="el-checkbox__inner"></span><input type="checkbox" aria-hidden="false" class="el-checkbox__original" value=""></span></label>');
      this.$checked = $checked;
      $li.prepend($checked);

      // 渲染
      var exist = checkedNodes.some(function (node) {
        return node.path.some(function (node) {
          return node.nodeId === nodeId;
        })
      });
      if (exist) {
        $li.addClass('in-checked-path');
        if (checkedNodeIds.indexOf(nodeId) !== -1) {
          this.$checked.find('.el-checkbox__input').addClass('is-checked');
        }
      }

      if (parentNode) {
        parentNode.$li.siblings().removeClass('in-active-path');
        parentNode.$li.addClass('in-active-path');
      }

      // 触发下一个节点
      this._liClick(function (event) {
        event.stopPropagation();
        var childrenNode = self.childrenNode;
        if (!self.disabled && leaf && event.type === 'click') {
          // 最后一级就默认选择
          self.selectedValue();
        }
        // 添加下级菜单
        cascader._appendMenu(childrenNode, level + 1, self);
      });

      if (this.disabled) {
        $checked.addClass('is-disabled');
        $checked.find('.el-checkbox__input').addClass('is-disabled');
        return;
      }
      // 选中事件
      $checked.click(function (event) {
        event.preventDefault();
        if (!leaf) {
          self.selectedValue();
          var childrenNode = self.childrenNode;
          // 添加下级菜单
          cascader._appendMenu(childrenNode, level + 1, self);
        }
      });
    },
    /**
     * 向上传递
     * @param callback 执行方法，如果返回false，则中断执行
     * @param advance 是否先执行一次
     * @param self  自身
     */
    transferParent: function (callback, advance, self) {
      if (!self) {
        self = this;
      }
      if (this !== self || advance) {
        var goOn = callback && callback(this);
        if (goOn === false) {
          return;
        }
      }
      this.parentNode && this.parentNode.transferParent(callback, advance, self);
    },
    /**
     * 向下传递
     * @param callback 执行的方法，如果返回false，则中断执行
     * @param advance 是否先执行一次
     * @param self  自身
     */
    transferChildren: function (callback, advance, self) {
      if (!self) {
        self = this;
      }
      if (this !== self || advance) {
        var goOn = callback && callback(this);
        if (goOn === false) {
          return;
        }
      }
      var children = this.getChildren();
      if (children && children.length > 0) {
        for (var index in children) {
          children[index].transferChildren(callback, advance, self);
        }
      }
    },
    /**
     * 设置级联值
     */
    selectedValue: function () {
      var nodeId = this.nodeId;
      var cascader = this.cascader;
      var multiple = this.props.multiple;
      var checkStrictly = this.props.checkStrictly;
      var leaf = this.leaf;
      if (!multiple && (leaf || checkStrictly)) {
        cascader._setActiveValue(nodeId, this);
      } else if (multiple) {
        var checkedNodeIds = cascader.data.checkedNodeIds;
        var checkedNodes = cascader.data.checkedNodes;
        var disabledFixed = this.config.disabledFixed;
        var paths;
        if (checkStrictly) {
          var index = checkedNodeIds.indexOf(nodeId);
          if (index === -1) {
            paths = checkedNodes.concat([this]);
          } else {
            paths = checkedNodes.concat();
            paths.splice(index, 1);
          }
        } else {
          var allLeafChildren = this.getAllLeafChildren();
          var checked;
          if (this._checked !== 1 && disabledFixed) {
            checked = this._getMultipleChecked(allLeafChildren);
          } else {
            checked = this._checked;
          }
          if (checked === 1) {
            // 选中->未选中
            paths = checkedNodes.filter(function (node1) {
              return !allLeafChildren.some(function (node2) {
                return node1.nodeId === node2.nodeId;
              });
            });
          } else {
            // 未选中、部分选中->选中
            var add = allLeafChildren.filter(function (node) {
              return checkedNodeIds.indexOf(node.nodeId) === -1;
            });
            paths = checkedNodes.concat(add);
          }
        }
        var nodeIds = paths.map(function (node) {
          return node.nodeId;
        });
        cascader._setCheckedValue(nodeIds, paths);
      }
    },
    _liLoad: function (event, callback) {
      var leaf = this.leaf;
      var lazy = this.props.lazy;
      var lazyLoad = this.props.lazyLoad;
      var children = this.children;
      var self = this;
      var cascader = this.cascader;
      var level = this.level;
      var multiple = this.props.multiple;
      var checkStrictly = this.props.checkStrictly;
      if (!leaf && (!children || children.length === 0) && lazy) {
        if (!self.loading) {
          self.loading = true;
          lazyLoad(self, function (nodes) {
            self.loading = false;
            self.setChildren(cascader.initNodes(nodes, level + 1, self));
            self.children = nodes;
            callback && callback(event);
            // 多选&关联时，重新同步下父级节点的样式
            multiple && !checkStrictly && self.transferParent(function (node) {
              node.syncStyle();
            }, true);
          });
        }
      } else {
        callback && callback(event);
      }
    },
    /**
     * 点击li事件
     * @param callback
     * @private
     */
    _liClick: function (callback) {
      var leaf = this.leaf;
      var $li = this.$li;
      var self = this;

      function load(event) {
        self._liLoad(event, callback);
      }

      if (this.props.expandTrigger === "click" || leaf) {
        $li.click(load);
      }
      if (this.props.expandTrigger === "hover") {
        $li.mouseenter(load);
      }
    },
    setChildren: function (children) {
      this.childrenNode = children;
    },
    getChildren: function () {
      return this.childrenNode;
    },
    /**
     * 同步样式
     */
    syncStyle: function () {
      var multiple = this.props.multiple;
      var checkStrictly = this.props.checkStrictly;
      if (multiple) {
        //多选
        if (checkStrictly) {
          this._sync.syncMultipleCheckStrictly(this);
        } else {
          this._sync.syncMultiple(this);
        }
      } else {
        //单选
        if (checkStrictly) {
          this._sync.syncRadioCheckStrictly(this);
        } else {
          this._sync.syncRadio(this);
        }
      }
    },
    /**
     * 同步本节点样式
     */
    _sync: {
      /**
       * 同步单选关联样式
       */
      syncRadio: function (self) {
        var $li = self.$li;
        var fromIcon = self.icons.from;
        var okIcon = self.icons.ok;
        var multiple = self.props.multiple;
        var checkStrictly = self.props.checkStrictly;
        var nodeId = self.nodeId;
        if (!$li || multiple || checkStrictly) {
          return;
        }
        var activeNode = self.cascader.data.activeNode;
        if (self.activeNodeId === nodeId) {
          var ok = $li.find('.' + okIcon);
          if (ok.length === 0) {
            $li.prepend('<i class="' + fromIcon + ' ' + okIcon + ' el-cascader-node__prefix"></i>');
          }
        } else {
          $li.find('.' + okIcon).remove();
        }
        if (activeNode && activeNode.path.some(function (node) {
          return node.nodeId === nodeId;
        })) {
          $li.addClass('is-active');
          $li.addClass('in-checked-path');
        } else {
          $li.removeClass('is-active');
          $li.removeClass('in-checked-path');
        }
      },
      /**
       * 同步单选非关联样式
       */
      syncRadioCheckStrictly: function (self) {
        var $li = self.$li;
        var checkStrictly = self.props.checkStrictly;
        var multiple = self.props.multiple;
        if (!$li || multiple || !checkStrictly) {
          return;
        }
        var $radio = self.$radio;
        var activeNode = self.cascader.data.activeNode;
        var nodeId = self.nodeId;
        if (self.activeNodeId === nodeId) {
          $radio.find('.el-radio__input').addClass('is-checked');
        } else {
          $radio.find('.el-radio__input').removeClass('is-checked');
        }
        if (activeNode && activeNode.path.some(function (node) {
          return node.nodeId === nodeId;
        })) {
          $li.addClass('is-active');
          $li.addClass('in-checked-path');
        } else {
          $li.removeClass('is-active');
          $li.removeClass('in-checked-path');
        }
      },
      /**
       * 同步多选关联样式
       */
      syncMultiple: function (self) {
        var $li = self.$li;
        var checkStrictly = self.props.checkStrictly;
        var multiple = self.props.multiple;
        var disabledFixed = self.config.disabledFixed;
        if (!multiple || checkStrictly) {
          return;
        }
        var allLeafChildren = self.getAllLeafChildren(disabledFixed);
        // 全部未选中 0
        // 全部选中 1
        // 部分选中 2
        var checked = self._getMultipleChecked(allLeafChildren);
        self._checked = checked;
        if (!$li) {
          return;
        }
        var $checkbox = self.$checked.find('.el-checkbox__input');
        if (checked === 0) {
          $checkbox.removeClass('is-checked');
          $checkbox.removeClass('is-indeterminate');
        } else if (checked === 1) {
          $checkbox.removeClass('is-indeterminate');
          $checkbox.addClass('is-checked');
        } else if (checked === 2) {
          $checkbox.removeClass('is-checked');
          $checkbox.addClass('is-indeterminate');
        }
      },
      /**
       * 同步多选非关联样式
       */
      syncMultipleCheckStrictly: function (self) {
        var $li = self.$li;
        var checkStrictly = self.props.checkStrictly;
        var multiple = self.props.multiple;
        if (!$li || !multiple || !checkStrictly) {
          return;
        }
        var checkedNodes = self.cascader.data.checkedNodes;
        var checkedNodeIds = self.checkedNodeIds;
        var nodeId = self.nodeId;
        var exist = checkedNodes.some(function (node) {
          return node.path.some(function (node) {
            return node.nodeId === nodeId;
          });
        });
        var $checkbox = self.$checked.find('.el-checkbox__input');
        if (checkedNodeIds.some(function (checkedNodeId) {
          return checkedNodeId === nodeId;
        })) {
          // 选中
          $checkbox.addClass('is-checked');
        } else {
          // 未选中
          $checkbox.removeClass('is-checked');
        }
        if (exist) {
          $li.addClass('in-checked-path');
        } else {
          $li.removeClass('in-checked-path');
        }
      }
    },
    /**
     * 获取叶子节点value值
     * @param disabled 是否包含禁用,默认不包含
     * @returns {Node[]|*[]}
     */
    getAllLeafChildren: function (disabled) {
      var leaf = this.leaf;
      if (leaf) {
        return [this];
      } else {
        var leafs = [];
        this.transferChildren(function (node) {
          if (node.disabled && !disabled) {
            return false;
          }
          node.leaf && leafs.push(node);
        });
        return leafs;
      }
    },
    /**
     * 展开当前节点
     */
    expandPanel: function () {
      var path = this.path;
      var cascader = this.cascader;
      path.forEach(function (node, index, array) {
        if (index !== array.length - 1) {
          var childrenNode = node.childrenNode;
          cascader._appendMenu(childrenNode, node.level + 1, node.parentNode);
        }
      });
    },
    _getMultipleChecked: function (leafNodes) {
      var cascader = this.cascader;
      var checkedNodeIds = cascader.data.checkedNodeIds;
      var allLeafIds = leafNodes.map(function (node) {
        return node.nodeId;
      });
      // 全部未选中 0
      // 全部选中 1
      // 部分选中 2
      var checked = 0;
      for (var i = 0; i < allLeafIds.length; i++) {
        var child = allLeafIds[i];
        if (checked === 2) {
          break;
        }
        if (checkedNodeIds.indexOf(child) !== -1) {
          if (i > 0 && checked !== 1) {
            checked = 2;
          } else {
            checked = 1;
          }
        } else {
          // 当全部选中时，则改为部分选中，否则全部未选中
          checked = checked === 1 ? 2 : 0;
        }
      }
      return checked;
    }
  };

  function Cascader(config) {
    this.config = $.extend(true, {
      elem: '',             //绑定元素
      value: null,          //预设值
      options: [],          //可选项数据源，键名可通过 Props 属性配置
      empty: '暂无数据',	  //无匹配选项时的内容
      placeholder: '请选择',//输入框占位文本
      disabled: false,      //是否禁用
      clearable: false,     //是否支持清空选项
      showAllLevels: true,  //输入框中是否显示选中值的完整路径
      collapseTags: false,  //多选模式下是否折叠Tag
      minCollapseTagsNumber: 1, //最小折叠标签数
      separator: ' / ',     //选项分隔符
      filterable: false,    //是否可搜索选项
      filterMethod: function (node, keyword) {
        return node.path.some(function (node) {
          return node.label.indexOf(keyword) !== -1;
        });
      }, //自定义搜索逻辑，第一个参数是节点node，第二个参数是搜索关键词keyword，通过返回布尔值表示是否命中
      debounce: 300,        //搜索关键词输入的去抖延迟，毫秒
      beforeFilter: function (value) {
        return true;
      },//筛选之前的钩子，参数为输入的值，若返回 false,则停止筛选
      popperClass: '',        //	自定义浮层类名	string
      extendClass: false,     //继承class样式
      extendStyle: false,     //继承style样式
      disabledFixed: false,   //固定禁用项，使禁用项不被清理删除，禁用项只能通过函数添加或初始值添加,默认禁用项不可被函数或初始值添加
      maxSize: 0,           // 多选选中的最大数量，0表示不限制
      props: {
        strictMode: false,      //严格模式，设置value严格按照层级结构.例如：[[1,2,3],[1,2,4]]
        expandTrigger: 'click', //次级菜单的展开方式	string	click / hover	'click'
        multiple: false,	      //是否多选	boolean	-	false
        checkStrictly: false, 	//是否严格的遵守父子节点不互相关联	boolean	-	false
        lazy: false,	        //是否动态加载子节点，需与 lazyLoad 方法结合使用	boolean	-	false
        lazyLoad: function (node, resolve) {
        },	//加载动态数据的方法，仅在 lazy 为 true 时有效	function(node, resolve)，node为当前点击的节点，resolve为数据加载完成的回调(必须调用)
        value: 'value',	        //指定选项的值为选项对象的某个属性值	string	—	'value'
        label: 'label',	        //指定选项标签为选项对象的某个属性值	string	—	'label'
        children: 'children',	  //指定选项的子选项为选项对象的某个属性值	string	—	'children'
        disabled: 'disabled',   //指定选项的禁用为选项对象的某个属性值	string	—	'disabled'
        leaf: 'leaf'	          //指定选项的叶子节点的标志位为选项对象的某个属性值	string	—	'leaf'
      }
    }, config);
    this.data = {
      nodeId: 1,            //nodeId的自增值
      nodes: [],            //存储Node对象
      menuData: [],         //压入菜单的数据
      activeNodeId: null,   //存放NodeId
      activeNode: null,     //存放Node
      checkedNodeIds: [],   //存放多个NodeId
      checkedNodes: []  //存放多个Node
    };
    // 面板是否展开
    this.showPanel = false;
    this.event = {
      // 值变更事件
      change: [],
      // 打开事件
      open: [],
      // 关闭事件
      close: []
    }
    // 是否正在搜索中
    this.filtering = false;
    // 初始化
    this._init();
    // 面板关闭事件id
    this.closeEventId = 0;
    // 是否进入maxSize模式
    this._maxSizeMode = false;
  }

  Cascader.prototype = {
    constructor: Cascader,
    get props() {
      return this.config.props;
    },
    get isFiltering() {
      return this.filtering;
    },
    set isFiltering(filtering) {
      if (this.filtering === filtering) {
        return;
      }
      this.filtering = !!filtering;
      var $panel = this.$panel;
      if (this.filtering) {
        $panel.find('.el-cascader-panel').hide();
        $panel.find('.el-cascader__suggestion-panel').show();
      } else {
        $panel.find('.el-cascader-panel').show();
        $panel.find('.el-cascader__suggestion-panel').hide();
        this.$tagsInput && this.$tagsInput.val('')
      }
    },
    set maxSizeMode(maxSizeMode) {
      if (this._maxSizeMode !== maxSizeMode) {
        this._maxSizeMode = maxSizeMode;
        this.refreshMenu();
      }
    },
    icons: {
      from: 'layui-icon',
      down: 'layui-icon-down',
      close: 'layui-icon-close',
      right: 'layui-icon-right',
      ok: 'layui-icon-ok',
      loading: 'layui-icon-loading-1 layui-anim layui-anim-rotate layui-anim-loop'
    },
    // 初始化
    _init: function () {
      this._checkConfig();
      // 初始化输入框
      this._initInput();
      // 初始化面板
      this._initPanel();
      // 初始化选项值
      this.setOptions(this.config.options);
      var self = this;
      // 监听滚动条
      $(window).scroll(function () {
        self._resetXY();
      });
      // 监听窗口
      $(window).resize(function () {
        self._resetXY();
      });
      // 点击事件，展开面板
      this.$div.click(function (event) {
        if (self.config.disabled) {
          return;
        }
        var show = self.showPanel;
        if (!show) {
          self.open();
        } else {
          self.close();
        }
      });
    },
    /**
     * 检查配置
     * @private
     */
    _checkConfig: function () {
      var elem = this.config.elem;
      if (!elem || $(elem).length === 0) {
        throw new Error("缺少elem节点选择器");
      }
      var maxSize = this.config.maxSize;
      if (typeof maxSize !== 'number' || maxSize < 0) {
        throw new Error("maxSize应是一个大于等于0的有效的number值");
      }
      if (!Array.isArray(this.config.options)) {
        throw new Error("options不是一个有效的数组");
      }
    },
    /**
     * 初始化根目录
     * @private
     */
    _initRoot: function () {
      var lazy = this.props.lazy;
      var lazyLoad = this.props.lazyLoad;
      var self = this;
      var nodes = this.data.nodes;
      if (nodes.length > 0 || !lazy) {
        this._appendMenu(nodes, 0);
      } else if (lazy) {
        this._appendMenu(nodes, 0);
        lazyLoad({
          root: true,
          level: 0
        }, function (nodes) {
          self.data.nodes = self.initNodes(nodes, 0, null);
          self._appendMenu(self.data.nodes, 0);
        });
      }
    },
    /**
     * 设置选项值
     * @param options
     */
    setOptions: function (options) {
      this.config.options = options;
      // 初始化节点
      this.data.nodes = this.initNodes(options, 0, null);
      // 初始化根目录
      this._initRoot();
      // 初始化值
      this.setValue(this.config.value);
    },
    // 面板定位
    _resetXY: function () {
      var $div = this.$div;
      var offset = $div.offset();
      var $panel = this.$panel;
      if ($panel) {
        var windowHeight = window.innerHeight;
        var windowWidth = window.innerWidth;
        var panelHeight = $panel.height();
        var panelWidth = $panel.width();
        var divHeight = $div.height();
        var boundingClientRect = $div[0].getBoundingClientRect();
        var $arrow = $panel.find('.popper__arrow');

        // 距离右边界的偏差值
        var offsetDiff = Math.min(windowWidth - boundingClientRect.x - panelWidth - 5, 0);

        var bottomHeight = windowHeight - (boundingClientRect.top + divHeight);
        if (bottomHeight < panelHeight && boundingClientRect.top > panelHeight + 20) {
          $panel.attr('x-placement', 'top-start')
          // 向上
          $panel.css({
            top: offset.top - 20 - panelHeight + 'px',
            left: offset.left + offsetDiff + 'px'
          });
        } else {
          $panel.attr('x-placement', 'bottom-start');
          // 距离底部边界的偏差值
          var yOffset = Math.max(panelHeight - (windowHeight - boundingClientRect.y - divHeight - 15), 0);
          // 向下
          $panel.css({
            top: offset.top + divHeight - yOffset + 'px',
            left: offset.left + offsetDiff + 'px'
          });
        }
        // 箭头偏移
        $arrow.css("left", 35 - offsetDiff + "px");
      }
    },
    get $menus() {
      return this.$panel && this.$panel.find('.el-cascader-panel .el-cascader-menu');
    },
    // 初始化输入框
    _initInput: function () {
      var $e = $(this.config.elem);
      var self = this;
      // 当绑定的元素带有value属性，并且对象未设置值时，设置一个初始值
      if (this.config.value === null && $e.attr('value')) {
        this.config.value = $e.attr('value');
      }
      var placeholder = this.config.placeholder;
      var fromIcon = this.icons.from;
      var downIcon = this.icons.down;
      var multiple = this.props.multiple;
      var extendClass = this.config.extendClass;
      var extendStyle = this.config.extendStyle;

      this.$div = $('<div class="el-cascader"></div>');
      if (extendStyle) {
        var style = $e.attr('style');
        if (style) {
          this.$div.attr('style', style);
        }
      }
      if (extendClass) {
        var className = $e.attr('class');
        if (className) {
          className.split(' ').forEach(function (name) {
            self.$div.addClass(name);
          });
        }
      }
      this.$input = $('<div class="el-input el-input--suffix">' +
        '<input type="text" readonly="readonly" autocomplete="off" placeholder="' + placeholder + '" class="el-input__inner">' +
        '<span class="el-input__suffix">' +
        '<span class="el-input__suffix-inner">' +
        '<i class="el-icon-arrow-down ' + fromIcon + ' ' + downIcon + '" style="font-size: 12px"></i>' +
        '</span></span>' +
        '</div>')
      this.$div.append(this.$input);
      this.$inputRow = this.$input.find('.el-input__inner');
      // 多选标签
      if (multiple) {
        this.$tags = $('<div class="el-cascader__tags"><!----></div>');
        this.$div.append(this.$tags);
      }
      var element = this._initHideElement($e);
      // 在后面插入元素
      element.after(this.$div);
      this.$icon = this.$input.find('i');
      this._initFilterableInputEvent();
      this.disabled(this.config.disabled);
    },
    /**
     * 初始化隐藏元素input，主要用于layui的表单验证
     * @param $e
     * @private
     */
    _initHideElement: function ($e) {
      var tagName = $e.prop("tagName").toLowerCase();
      // 保存原始元素
      if (tagName === 'input') {
        $e.hide();
        $e.attr('type', 'hidden')
        this.$ec = $e;
        return $e;
      } else {
        var attributes = $e[0].attributes;
        var $input = $('<input />');
        var keys = Object.keys(attributes);
        for (var key in keys) {
          var attribute = attributes[key];
          $input.attr(attribute.name, attribute.value);
        }
        $input.hide();
        $input.attr('type', 'hidden')
        this.$ec = $input;
        $e.before($input);
        $e.remove();
        return $input;
      }
    },
    /**
     * 初始化可搜索监听事件
     * @private
     */
    _initFilterableInputEvent: function () {
      var filterable = this.config.filterable;
      if (!filterable) {
        return;
      }
      var timeoutID;
      var multiple = this.props.multiple;
      var debounce = this.config.debounce;
      var placeholder = this.config.placeholder;
      var beforeFilter = this.config.beforeFilter;
      var filterMethod = this.config.filterMethod;
      var checkStrictly = this.props.checkStrictly;
      var self = this;

      function filter(event) {
        var input = this;
        if (timeoutID) {
          clearTimeout(timeoutID);
        }
        timeoutID = setTimeout(function () {
          timeoutID = null;
          var val = $(input).val();
          if (!val) {
            self.isFiltering = false;
            return;
          }
          self.open();
          if (typeof beforeFilter === 'function' && beforeFilter(val)) {
            self.isFiltering = true;
            var nodes = self.getNodes();
            var filterNodes = nodes.filter(function (node) {
              var disabled;
              if (checkStrictly) {
                disabled = node.disabled;
              } else {
                disabled = node.path.some(function (node) {
                  return node.disabled;
                });
              }
              if ((node.leaf || checkStrictly) && !disabled) {
                if (typeof filterMethod === 'function' && filterMethod(node, val)) {
                  // 命中
                  return true;
                }
              }
              return false;
            });
            self._setSuggestionMenu(filterNodes);
          }
        }, debounce);
      }

      if (multiple) {
        // 多选可搜索
        this.$tagsInput = $('<input type="text" autocomplete="off" placeholder="' + placeholder + '" class="el-cascader__search-input">');
        var $tagsInput = this.$tagsInput;
        this.$tags.append($tagsInput);
        $tagsInput.on('keydown', filter);
        $tagsInput.click(function (event) {
          if (self.isFiltering) {
            event.stopPropagation();
          }
        });
      } else {
        var $inputRow = this.$inputRow;
        // 单选可搜索
        $inputRow.removeAttr('readonly');
        $inputRow.on('keydown', filter);
        $inputRow.click(function (event) {
          if (self.isFiltering) {
            event.stopPropagation();
          }
        });
      }
    },
    // 初始化面板(panel(1))
    _initPanel: function () {
      var $panel = this.$panel;
      var popperClass = this.config.popperClass || '';
      if (!$panel) {
        // z-index：解决和layer.open默认19891016的冲突
        this.$panel = $('<div class="el-popper el-cascader__dropdown ' + popperClass + '" style="position: absolute; z-index: 109891015;display: none;" x-placement="bottom-start"><div class="el-cascader-panel"></div><div class="popper__arrow" style="left: 35px;"></div></div>');
        $panel = this.$panel;
        $panel.appendTo('body');
        $panel.click(function (event) {
          // 阻止事件冒泡
          event.stopPropagation();
        });
        // 初始化可搜索面板
        this._initSuggestionPanel();
      }
    },
    /**
     * 添加菜单(panel(1)->menu(n))
     * @param nodes 当前层级数据
     * @param level 层级，从0开始
     * @param parentNode 父级节点
     * @param _menuItem 刷新时，传入的当前菜单的item数据
     * @private
     */
    _appendMenu: function (nodes, level, parentNode, _menuItem) {
      this._removeMenu(level);

      if (parentNode && parentNode.leaf) {
        return;
      }

      var menuData = this.data.menuData;
      var $div = $('<div class="el-scrollbar el-cascader-menu" role="menu" id="cascader-menu"><div class="el-cascader-menu__wrap el-scrollbar__wrap" style="margin-bottom: -17px; margin-right: -17px;"><ul class="el-scrollbar__view el-cascader-menu__list"></ul></div></div>');
      // 重新添加菜单
      this.$panel.find('.el-cascader-panel').append($div);
      // 渲染细项
      this._appendLi($div, nodes);
      var menuItem = {nodes: nodes, level: level, parentNode: parentNode, scrollbar: {top: 0, left: 0}};
      if (_menuItem) {
        menuItem.scrollbar = _menuItem.scrollbar
      }
      // 渲染滚动条
      this._initScrollbar($div, menuItem);
      // 重新定位面板
      this._resetXY();
      menuData.push(menuItem);
    },
    /**
     * 移除菜单
     * @param level
     * @private
     */
    _removeMenu: function(level) {
      // 除了上一层的所有菜单全部移除
      var number = level - 1;
      if (number !== -1) {
        this.$panel.find('.el-cascader-panel .el-cascader-menu:gt(' + number + ')').remove();
      } else {
        this.$panel.find('.el-cascader-panel .el-cascader-menu').remove();
      }
      // 保存菜单数据
      var menuData = this.data.menuData;
      if (menuData.length > level) {
        menuData.splice(level, menuData.length - level);
      }
    },
    /**
     * 添加细项(panel(1)->menu(n)->li(n))
     * @param $menu 当前菜单对象
     * @param nodes  当前层级数据
     * @private
     */
    _appendLi: function ($menu, nodes) {
      var $list = $menu.find('.el-cascader-menu__list');
      if (!nodes || nodes.length === 0) {
        var isEmpty = this.config.empty;
        $list.append('<div class="el-cascader-menu__empty-text">' + isEmpty + '</div>');
        return;
      }
      $.each(nodes, function (index, node) {
        node.bind($list);
      });
    },
    /**
     * 刷新菜单面板
     */
    refreshMenu: function () {
      // 先复制一个数组，避免刷新菜单时，数组的数据被改变
      var data = this.data.menuData.concat([]);
      var self = this;
      data.forEach(function (data) {
        self._appendMenu(data.nodes, data.level, data.parentNode, data);
      })
    },
    /**
     * 初始化可搜索面板
     * @private
     */
    _initSuggestionPanel: function () {
      var filterable = this.config.filterable;
      if (!filterable) {
        return;
      }
      var $suggestionPanel = this.$suggestionPanel;
      if (!$suggestionPanel) {
        this.$suggestionPanel = $('<div class="el-cascader__suggestion-panel el-scrollbar" style="display: none;"><div class="el-scrollbar__wrap" style="margin-bottom: -17px; margin-right: -17px;"><ul class="el-scrollbar__view el-cascader__suggestion-list" style="min-width: 222px;"></ul></div></div>');
        $suggestionPanel = this.$suggestionPanel;
        this.$panel.find('.popper__arrow').before($suggestionPanel);
        $suggestionPanel.click(function (event) {
          // 阻止事件冒泡
          event.stopPropagation();
        });
      }
    },
    /**
     * 设置可搜索菜单
     * @param nodes
     * @private
     */
    _setSuggestionMenu: function (nodes) {
      var $suggestionPanel = this.$suggestionPanel;
      var $list = $suggestionPanel.find('.el-cascader__suggestion-list');
      $list.empty();
      $suggestionPanel.find('.el-scrollbar__bar').remove();
      if (!nodes || nodes.length === 0) {
        $list.append('<li class="el-cascader__empty-text">无匹配数据</li>');
        return;
      }
      $.each(nodes, function (index, node) {
        node.bindSuggestion($list);
      });
      this._initScrollbar($suggestionPanel,{scrollbar: {top: 0, left: 0}});
      this._resetXY();
    },
    /**
     * 初始化节点数据
     * @param data 原始数据
     * @param level 层级
     * @param parentNode  父级节点
     * @returns {*[]}
     */
    initNodes: function (data, level, parentNode) {
      var nodes = [];
      for (var key in data) {
        var datum = data[key];
        var node = new Node(datum, this, level, parentNode);
        nodes.push(node);
        if (node.children && node.children.length > 0) {
          node.setChildren(this.initNodes(node.children, level + 1, node));
        }
      }
      return nodes;
    },
    /**
     * 设置单选值
     * @param nodeId 节点id
     * @param node   节点对象
     * @private
     */
    _setActiveValue: function (nodeId, node) {
      if (this.data.activeNodeId !== nodeId) {
        var activeNode = this.data.activeNode;
        this.data.activeNodeId = nodeId;
        this.data.activeNode = node;
        activeNode && activeNode.transferParent(function (node) {
          node.syncStyle();
        }, true);
        node && node.transferParent(function (node) {
          node.syncStyle();
        }, true);
        // 填充路径
        this.change(node && node.value, node);
        if (nodeId !== null) {
          this._setClear();
        }
      }
    },
    /**
     * 设置多选值
     * @param nodeIds 值数组
     * @param nodes 节点数组
     * @private
     */
    _setCheckedValue: function (nodeIds, nodes) {
      var checkedNodes = this.data.checkedNodes;
      var maxSize = this.config.maxSize;
      var maxSizeMode;
      if (nodeIds.length > 0 && maxSize !== 0 && nodeIds.length >= maxSize) {
        nodeIds = nodeIds.slice(0, maxSize);
        nodes = nodes.slice(0, maxSize);
        maxSizeMode = true
      } else {
        maxSizeMode = false
      }
      this.data.checkedNodeIds = nodeIds || [];
      this.data.checkedNodes = nodes || [];
      var syncPath = [];
      var syncNodeIds = [];
      checkedNodes.forEach(function (node) {
        node.path.forEach(function (node) {
          if (syncNodeIds.indexOf(node.nodeId) === -1) {
            syncPath.push(node);
            syncNodeIds.push(node.nodeId);
          }
        });
      });
      nodes.forEach(function (node) {
        node.path.forEach(function (node) {
          if (syncNodeIds.indexOf(node.nodeId) === -1) {
            syncPath.push(node);
            syncNodeIds.push(node.nodeId);
          }
        });
      });
      syncPath.forEach(function (node) {
        node.syncStyle();
      });
      // 填充路径
      this.change(nodes.map(function (node) {
        return node.value;
      }), nodes);
      this._setClear();
      this.maxSizeMode = maxSizeMode;
    },
    /**
     * 设置值
     * @param value
     */
    setValue: function (value) {
      if (this.data.activeNodeId || this.data.checkedNodeIds.length > 0) {
        // 清空值
        this.clearCheckedNodes();
      }
      if (!value) {
        return;
      }
      var strictMode = this.props.strictMode;
      if (strictMode) {
        if (!Array.isArray(value)) {
          throw new Error("严格模式下,value必须是一个包含父子节点数组结构.");
        }
      }
      var nodes = this.getNodes(this.data.nodes);
      var checkStrictly = this.props.checkStrictly;
      var multiple = this.props.multiple;
      var disabledFixed = this.config.disabledFixed;
      if (multiple) {
        var paths = nodes.filter(function (node) {
          if ((checkStrictly || node.leaf) && (!node.disabled || disabledFixed)) {
            if (strictMode) {
              // 严格模式下
              // some:命中一个就为true
              // every:全部命中为true
              return value.some(function (levelValue) {
                if (!Array.isArray(levelValue)) {
                  throw new Error("多选严格模式下,value必须是一个二维数组结构.");
                }
                var path = node.path;
                return levelValue.length === path.length && levelValue.every(function (rowValue, index) {
                  return path[index].value === rowValue;
                });
              })
            } else {
              return value.indexOf(node.value) !== -1;
            }
          }
          return false;
        });
        var nodeIds = paths.map(function (node) {
          return node.nodeId;
        });
        this._setCheckedValue(nodeIds, paths);
        // 展开第一个节点
        if (paths.length > 0) {
          var first = paths[0];
          first.expandPanel();
        }
      } else {
        for (var i = 0; i < nodes.length; i++) {
          var node = nodes[i];
          if ((checkStrictly || node.leaf)) {
            var is = false;
            if (strictMode) {
              // 严格模式下
              // every:全部命中为true
              var path = node.path;
              is = value.length === path.length && value.every(function (rowValue, index) {
                return path[index].value === rowValue;
              });
            } else if (node.value === value) {
              is = true;
            }
            if (is) {
              this._setActiveValue(node.nodeId, node);
              // 展开节点
              node.expandPanel();
              break;
            }
          }
        }
      }
    },
    /**
     * 递归获取扁平的节点
     * @param nodes
     * @param container
     * @returns {*[]}
     */
    getNodes: function (nodes, container) {
      if (!container) {
        container = [];
      }
      if (!nodes) {
        nodes = this.data.nodes;
      }
      var self = this;
      nodes.forEach(function (node) {
        container.push(node);
        var children = node.getChildren();
        if (children) {
          self.getNodes(children, container);
        }
      });
      return container;
    },
    /**
     * 初始化滚动条
     * @param $menu   菜单的dom节点对象
     * @param menuItem 当前菜单数据
     * @private
     */
    _initScrollbar: function ($menu, menuItem) {
      var $div = $('<div class="el-scrollbar__bar is-onhoriztal"><div class="el-scrollbar__thumb" style="transform: translateX(0%);"></div></div><div class="el-scrollbar__bar is-vertical"><div class="el-scrollbar__thumb" style="transform: translateY(0%);"></div></div>');
      $menu.append($div);
      var vertical = $($div[1]).find('.el-scrollbar__thumb');
      var onhoriztal = $($div[0]).find('.el-scrollbar__thumb');
      var scrollbar = $menu.find('.el-scrollbar__wrap');
      var $panel = this.$panel;
      var $lis = $menu.find('li');
      var height = Math.max($panel.height(), $menu.height());
      var hScale = (height - 6) / ($lis.height() * $lis.length);
      var wScale = $panel.width() / $lis.width();

      // 滚动条监听事件
      function _scrollbarEvent(scrollTop, scrollLeft) {
        if (hScale < 1) {
          vertical.css('height', hScale * 100 + '%');
          vertical.css('transform', 'translateY(' + scrollTop / $menu.height() * 100 + '%)');
        }
        if (wScale < 1) {
          onhoriztal.css('width', wScale * 100 + '%');
          onhoriztal.css('transform', 'translateY(' + scrollLeft / $menu.width() * 100 + '%)');
        }
      }

      // 拖动事件
      vertical.mousedown(function (event) {
        event.stopImmediatePropagation();
        event.stopPropagation();
        // 禁止文本选择事件
        var selectstart = function () {
          return false;
        };
        $(document).bind("selectstart", selectstart);
        var y = event.clientY;
        var scrollTop = scrollbar.scrollTop();
        // 移动事件
        var mousemove = function (event) {
          event.stopImmediatePropagation();
          var number = scrollTop + (event.clientY - y) / hScale;
          scrollbar.scrollTop(number);
        };
        $(document).bind('mousemove', mousemove);
        // 鼠标松开事件
        $(document).one('mouseup', function (event) {
          event.stopPropagation();
          event.stopImmediatePropagation();
          $(document).off('mousemove', mousemove);
          $(document).off('selectstart', selectstart);
        });
      });
      // 监听滚动条事件
      scrollbar.scroll(function () {
        var scroll = $(this);
        menuItem.scrollbar.top = scroll.scrollTop()
        menuItem.scrollbar.left = scroll.scrollLeft()
        _scrollbarEvent(menuItem.scrollbar.top, menuItem.scrollbar.left);
      });

      // 初始化滚动条
      scrollbar.scrollTop(menuItem.scrollbar.top);
      _scrollbarEvent(menuItem.scrollbar.top, menuItem.scrollbar.left);
    },
    // 填充路径
    _fillingPath: function () {
      var multiple = this.props.multiple;
      var showAllLevels = this.config.showAllLevels;
      var separator = this.config.separator;
      var collapseTags = this.config.collapseTags;
      var $inputRow = this.$inputRow;
      var placeholder = this.config.placeholder;
      var self = this;
      if (!multiple) {
        var activeNode = this.data.activeNode;
        var path = activeNode && activeNode.path || [];
        if (showAllLevels) {
          this._$inputRowSetValue(path.map(function (node) {
            return node.label;
          }).join(separator));
        } else {
          this._$inputRowSetValue(activeNode && activeNode.label || "");
        }
      } else {
        // 复选框

        // 删除标签
        this.$tags.find('.el-tag').remove();
        var $tagsInput = this.$tagsInput;
        // 清除高度
        $inputRow.css('height', '');
        var checkedNodes = this.data.checkedNodes;
        var minCollapseTagsNumber = Math.max(this.config.minCollapseTagsNumber, 1);
        if (checkedNodes.length > 0) {
          var tags = [];
          var paths = checkedNodes;
          if (collapseTags) {
            // 折叠tags
            paths = checkedNodes.slice(0, Math.min(checkedNodes.length, minCollapseTagsNumber));
          }
          paths.forEach(function (node) {
            tags.push(node.$tag);
          });
          // 判断标签是否折叠
          if (collapseTags) {
            // 判断标签最小折叠数
            if (checkedNodes.length > minCollapseTagsNumber) {
              tags.push(self.get$tag('+ ' + (checkedNodes.length - minCollapseTagsNumber), false));
            }
          }
          tags.forEach(function (tag) {
            if ($tagsInput) {
              $tagsInput.before(tag)
            } else {
              self.$tags.append(tag);
            }
          });
        }
        var tagHeight = self.$tags.height();
        var inputHeight = $inputRow.height();
        if (tagHeight > inputHeight) {
          $inputRow.css('height', tagHeight + 4 + 'px');
        }
        // 重新定位
        this._resetXY();
        if (checkedNodes.length > 0) {
          $inputRow.removeAttr('placeholder');
          $tagsInput && $tagsInput.removeAttr('placeholder', placeholder);
        } else {
          $inputRow.attr('placeholder', placeholder);
          $tagsInput && $tagsInput.attr('placeholder', placeholder);
        }
      }
    },
    /**
     * 设置单选输入框的值
     * @param label
     * @private
     */
    _$inputRowSetValue: function (label) {
      label = label || "";
      var $inputRow = this.$inputRow;
      $inputRow.attr('value', label); //防止被重置
      $inputRow.val(label);
    },
    /**
     * 获取复选框标签对象
     * @param label
     * @param showCloseIcon 是否显示关闭的icon
     * @returns {jQuery|HTMLElement|*}
     */
    get$tag: function (label, showCloseIcon) {
      var fromIcon = this.icons.from;
      var closeIcon = this.icons.close;
      var icon = showCloseIcon ? '<i class="el-tag__close el-icon-close ' + fromIcon + ' ' + closeIcon + '"></i>' : '';
      return $('<span class="el-tag el-tag--info el-tag--small el-tag--light"><span>' + label + '</span>' + icon + '</span>');
    },
    // 设置可清理
    _setClear: function () {
      var self = this;

      function enter() {
        self.$icon.removeClass(self.icons.down);
        self.$icon.addClass(self.icons.close);
      }

      function out() {
        self.$icon.removeClass(self.icons.close);
        self.$icon.addClass(self.icons.down);
      }

      self.$div.mouseenter(function () {
        enter();
      });
      self.$div.mouseleave(function () {
        out();
      });
      self.$icon.off('click');
      var multiple = this.props.multiple;
      var clear;
      if (multiple) {
        clear = this.data.checkedNodeIds.length > 0;
      } else {
        clear = !!this.data.activeNodeId;
      }
      if (clear && !this.config.disabled && this.config.clearable) {
        self.$icon.one('click', function (event) {
          event.stopPropagation();
          self.close();
          self.clearCheckedNodes();
          out();
          self.$icon.off('mouseenter');
          self.$div.off('mouseenter');
          self.$div.off('mouseleave');
        });
      } else {
        out();
        self.$icon.off('mouseenter');
        self.$div.off('mouseenter');
        self.$div.off('mouseleave');
      }
    },
    // 禁用
    disabled: function (isDisabled) {
      this.config.disabled = !!isDisabled;
      if (this.config.disabled) {
        this.$div.addClass('is-disabled');
        this.$div.find('.el-input--suffix').addClass('is-disabled');
        this.$inputRow.attr('disabled', 'disabled');
        this.$tagsInput && this.$tagsInput.attr('disabled', 'disabled').hide()
      } else {
        this.$div.removeClass('is-disabled');
        this.$div.find('.el-input--suffix').removeClass('is-disabled');
        this.$inputRow.removeAttr('disabled');
        this.$tagsInput && this.$tagsInput.removeAttr('disabled').show();
      }
      // 重新设置是否可被清理
      this._setClear();
      // 重新填充路径
      this._fillingPath();
    },
    /**
     * 当选中节点变化时触发  选中节点的值
     * @param value 值
     * @param node  节点
     */
    change: function (value, node) {
      var multiple = this.props.multiple;
      if (multiple) {
        if (value && value.length > 0) {
          this.$ec.attr('value', JSON.stringify(value));
          // this.$ec.val(JSON.stringify(value));
        } else {
          this.$ec.removeAttr('value');
          // this.$ec.val('');
        }
      } else {
        this.$ec.attr('value', value || "");
        // this.$ec.val(value);
      }
      // 填充路径
      this._fillingPath();
      this.event.change.forEach(function (e) {
        typeof e === 'function' && e(value, node)
      })
    },
    /**
     * 当失去焦点时触发  (event: Event)
     * @param eventId 不为空时，必须与closeEventId值相等，防止旧事件触发
     */
    close: function (eventId) {
      if (this.showPanel && (!eventId || this.closeEventId === eventId)) {
        this.showPanel = false;
        this.$div.find('.layui-icon-down').removeClass('is-reverse');
        this.$panel.slideUp(100);
        this.visibleChange(false);
        // 聚焦颜色
        this.$input.removeClass('is-focus');
        // 可搜索
        var filterable = this.config.filterable;
        if (filterable) {
          this.isFiltering = false;
          this._fillingPath();
        }
        this.event.close.forEach(function (e) {
          typeof e === 'function' && e()
        })
      }
    },
    /**
     * 当获得焦点时触发  (event: Event)
     */
    open: function () {
      if (!this.showPanel) {
        this.showPanel = true;
        this.closeEventId++;
        var self = this;
        // 当前传播事件结束后，添加点击背景关闭面板事件
        setTimeout(function () {
          $(document).one('click', self.close.bind(self, self.closeEventId));
        });
        // 重新定位面板
        this._resetXY();
        // 箭头icon翻转
        this.$div.find('.layui-icon-down').addClass('is-reverse');
        this.$panel.slideDown(200);
        this.visibleChange(true);
        // 聚焦颜色
        this.$input.addClass('is-focus');
        this.event.open.forEach(function (e) {
          typeof e === 'function' && e()
        })
      }
    },
    /**
     * 下拉框出现/隐藏时触发
     * @param visible 出现则为 true，隐藏则为 false
     */
    visibleChange: function (visible) {
    },
    /**
     * 在多选模式下，移除Tag时触发  移除的Tag对应的节点的值
     * @param tagValue 节点的值
     * @param node 节点对象
     */
    removeTag: function (tagValue, node) {
    },
    /**
     * 获取选中的节点值
     * @returns {null|[]}
     */
    getCheckedValues: function () {
      var strictMode = this.props.strictMode;
      if (this.props.multiple) {
        var checkedNodes = this.data.checkedNodes;
        if (strictMode) {
          return checkedNodes.map(function (node) {
            return node.path.map(function (node1) {
              return node1.value;
            });
          });
        }
        return checkedNodes.map(function (node) {
          return node.value;
        });
      } else {
        var activeNode = this.data.activeNode;
        if (strictMode) {
          return activeNode && activeNode.path.map(function (node) {
            return node.value;
          })
        }
        return activeNode && activeNode.value;
      }
    },
    /**
     * 获取选中的节点
     * @returns {null|[]}
     */
    getCheckedNodes: function () {
      var strictMode = this.props.strictMode;
      if (this.props.multiple) {
        var checkedNodes = this.data.checkedNodes;
        if (strictMode) {
          return checkedNodes && checkedNodes.map(function (node) {
            return node.path;
          });
        }
        return checkedNodes;
      } else {
        var activeNode = this.data.activeNode;
        if (strictMode) {
          return activeNode && activeNode.path;
        }
        return activeNode;
      }
    },
    /**
     * 清空选中的节点
     * @param force 强制清理禁用固定节点
     */
    clearCheckedNodes: function (force) {
      var multiple = this.props.multiple;
      if (multiple) {
        var disabledFixed = this.config.disabledFixed;
        if (!force && disabledFixed) {
          //禁用项被固定，则过滤出禁用项的选值出来
          var checkedNodes = this.data.checkedNodes;
          var disNodes = checkedNodes.filter(function (node) {
            return node.disabled;
          });
          var nodeIds = disNodes.map(function (node) {
            return node.nodeId;
          });
          this._setCheckedValue(nodeIds, disNodes);
        } else {
          this._setCheckedValue([], []);
        }
      } else {
        this._setActiveValue(null, null);
      }
    }
  };

  var thisCas = function () {
    var self = this;
    return {
      /**
       * 设置选项值
       * @param options
       */
      setOptions: function (options) {
        self.setOptions(options);
      },
      /**
       * 覆盖当前值
       * @param value 单选时传对象，多选时传数组
       */
      setValue: function (value) {
        self.setValue(value);
      },
      /**
       * 当节点变更时，执行回调
       * @param callback  function(value,node){}
       */
      changeEvent: function (callback) {
        self.event.change.push(callback);
      },
      /**
       * 当面板关闭时，执行回调
       * @param callback  function(){}
       */
      closeEvent: function (callback) {
        self.event.close.push(callback);
      },
      /**
       * 当面板打开时，执行回调
       * @param callback  function(){}
       */
      openEvent: function (callback) {
        self.event.open.push(callback);
      },
      /**
       * 禁用组件
       * @param disabled true/false
       */
      disabled: function (disabled) {
        self.disabled(disabled);
      },
      /**
       * 收起面板
       */
      close: function () {
        self.close();
      },
      /**
       * 展开面板
       */
      open: function () {
        self.open();
      },
      /**
       * 获取选中的节点，如需获取路径，使用node.path获取,将获取各级节点的node对象
       * @returns {[]|*}
       */
      getCheckedNodes: function () {
        return self.getCheckedNodes();
      },
      /**
       * 获取选中的值
       * @returns {[]|*}
       */
      getCheckedValues: function () {
        return self.getCheckedValues();
      },
      /**
       * 清空选中的节点
       * @param force 强制清理禁用固定节点
       */
      clearCheckedNodes: function (force) {
        self.clearCheckedNodes(force);
      },
      /**
       * 展开面板到节点所在的层级
       * @param value 节点值，只能传单个值，不允许传数组
       */
      expandNode: function (value) {
        var nodes = self.getNodes(self.data.nodes);
        for (var i = 0; i < nodes.length; i++) {
          var node = nodes[i];
          if (node.value === value) {
            node.expandPanel();
            break;
          }
        }
      },
      /**
       * 获取当前配置副本
       */
      getConfig: function () {
        return $.extend(true, {}, self.config);
      },
      /**
       * 获取数据对象副本
       * @returns {*}
       */
      getData: function () {
        return $.extend(true, {}, self.data);
      }
    };
  };

  // layui.cache.base取的是layui.config里面配置的base
  layui.link(layui.cache.base + 'cascader/cascader.css');

  exports('layCascader', function (option) {
    var ins = new Cascader(option);
    return thisCas.call(ins);
  });
});
