elementui下拉框联动（Element树形控件整合带图标的下拉菜单tree+dropdown+input）

<el-col :span="4" :xs="24">
   <!--目录搜索功能-->
  <li class="head-container">
    <el-input
      v-model="dirNameCn"
      placeholder="请输入目录名称"
      clearable
      size="small"
      prefix-icon="el-icon-search"
      style="margin-bottom: 20px"
    />
  </li>
  <!--树的展示-->
  <li class="head-container">
    <el-tree
      :data="dirTreeOptions"
      :props="defaultProps"
      :expand-on-click-node="false"
      :filter-node-method="filterNode"
      ref="tree"
      default-expand-all
      @node-click="handleNodeClick"
      icon-class="el-icon-folder-opened"
      node-key="id"
      :check-on-click-node="true"
    >
      <!--隐藏的新增等图标-->
      <span class="custom-tree-node" slot-scope="{ node, data }" @mouseenter="mouseenter(data)" @mouseleave="mouseleave(data)">
        <span>{{ node.label }}</span>
        <li>
          <i v-show="data.show" class="el-icon-circle-plus" style="color: #00afff" @click="addDial(node, data)"/>
          <!--隐藏的下拉选-->
          <el-dropdown trigger="click" placement="right" @command="(command) => {handleCommand(command)}">
            <i v-show="data.show" class="el-icon-more" style="color: #D3D3D3"/>
            <el-dropdown-menu slot="dropdown">
              <el-dropdown-item command="a">重命名</el-dropdown-item>
              <el-dropdown-item command="b">删除</el-dropdown-item>
            </el-dropdown-menu>
          </el-dropdown>
        </li>
      </span>
    </el-tree>
  </li>
</el-col>

<script>
  export default {
    name: 'reqmdoctree',
    data() {
      return {
        // 左侧搜索框内容
        dirNameCn: '',
       	// 目录树选项
        dirTreeOptions: undefined,
        defaultProps: {
          children: "children",
          label: "label"
        },
        // 树形菜单中有无子节点
        yesChild: undefined,
        // 控制左侧新增提示信息框
        show: 0,
        // 查询需求文档信息参数
        queryParams: {
          docNo: undefined, // 文档编号
          docNameEn: undefined, // 文档英文名称
          dirNo: undefined,// 目录编号
          current: 1, // 当前页数
          size: 20 // 每页显示多少条
        },
        treeId: undefined,
      }
    },
    methods: {
      /** 查询需求目录下拉树结构 */
      getTreeselect() {
        treeselect().then(response => {
          this.dirTreeOptions = response.data
        })
      },
      // 搜索值为过滤函数
      filterNode(value, data) {
        if (!value) return true
        return data.label.indexOf(value) !== -1
      },
      // 节点被点击时的回调函数
      handleNodeClick(data) {
        // console.log(data)
        this.treeId = data.id
        this.yesChild = data.children
        this.queryParams.dirNo = data.id
        this.getList()
      },
      // 树中三个点的事件
      handleCommand(command) {
        if (command == 'a') {
          selectReqNo(this.treeId).then(response => {
            this.uuid = response.msg
            getObjTree(response.msg).then(response => {
              this.form = response.data
              this.open = true
              this.title = '修改需求文档目录配置表'
            })
          })
        }
        if (command == 'b') {
          if (this.yesChild != undefined) {
            this.$notify.error({
              title: '警告',
              message: '此目录下还有别的文件夹'
            })
          } else {
            selectReqNo(this.treeId).then(response => {
              this.uuid = response.msg
              this.$confirm('是否确认删除ID为' + this.uuid + '的数据项？', '警告', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
              }).then(()=>{
                return delObjTree(this.uuid)
              }).then(data => {
                this.getTreeselect()
                this.msgSuccess('删除成功')
              }).catch(function() {
              })
            })
          }
        }
      },
      // 左侧新建目录/文件
      addDial(node, data) {
        // console.log(node, '---', data)
        this.reset()
        this.form.dirParentId = data.id
        this.open = true
        this.title = '添加需求文档目录配置表'
      },
      // 左侧鼠标悬浮展示图标
      mouseenter(data){
        this.$set(data, 'show', true)
      },
      // 左侧鼠标离开不展示图标
      mouseleave(data){
        this.$set(data, 'show', false)
      },
      //打开新增资源弹窗 这里略......
    }
  }
</script>