<el-select
  ref="chooseProjectName"
  v-model="filterText"
  multiple
  collapse-tags
  placeholder="请选择"
  @focus="handleTestTasks"
  @visible-change="visibleType"
  @remove-tag="removeTag"
>
  <el-option
     v-for="item in options"
     :key="item.value"
     :label="item.label"
     :value="item.value"
   ></el-option>
</el-select>


<el-tree
  ref="tree"
  class="newTreeStyle"
  style="padding: 10px"
  :data="treeData"
  show-checkbox
  default-expand-all
  node-key="id"
  highlight-current
  :props="defaultProps"
  check-strictly
  :default-checked-keys="ruleForm.treeList"
  @check-change="getCurrentData"
></el-tree>


// 阻止下拉框弹出

handleTestTasks() {
  let _this = this;
  _this .$refs.chooseProjectName.blur();
},
visibleType(e) {
  // 弹框
  let _this = this;
  _this.$nextTick(() => {
  // 不显示下拉框
    _this.$refs.chooseProjectName.blur();
  });
},

// 下拉组件删除节点触发
removeTag(data) {
      let _this = this;
      // 清除对应树节点
      let getCheckItem = _this.$refs.tree.getCheckedNodes();
      let hasExict = getCheckItem.find((gitem, index) => {
        return gitem.id == data;
      });
      if (hasExict) {
        _this.$refs.tree.setChecked(hasExict, false);
      }
    },

// 获取当前选中树组件的节点，双向绑定到下拉组件，
getCurrentData() {
  let _this = this;
  _this.filterText = _this.$refs.tree.getCheckedKeys();
},


//相关数据
filterText: [],
treeData: [
  {
    id: 1,
    label: '一级 1',
    children: [
      {
        id: 4,
        label: '二级 1-1',
        children: [
           {
             id: 9,
             label: '三级 1-1-1',
           },
           {
             id: 10,
             label: '三级 1-1-2',
           },
        ],
       },
     ],
        },
        {
          id: 2,
          label: '一级 2',
          children: [
            {
              id: 5,
              label: '二级 2-1',
            },
            {
              id: 6,
              label: '二级 2-2',
            },
          ],
        },
        {
          id: 3,
          label: '一级 3',
          children: [
            {
              id: 7,
              label: '二级 3-1',
            },
            {
              id: 8,
              label: '二级 3-2',
            },
          ],
        },
      ],
      defaultProps: {
        children: 'children',
        label: 'label',
      },
      options: [
        {
          value: 1,
          label: '一级 1',
        },
        {
          value: 2,
          label: '一级 2',
        },
        {
          value: '选项3',
          label: '蚵仔煎',
        },
        {
          value: '选项4',
          label: '龙须面',
        },
        {
          value: '选项5',
          label: '北京烤鸭',
        },
      ],