vue+Select+Tree实现单选 默认选中全部

实现的功能如图，Select实现tree的单选，默认选择全部。

选择tree的数据后则关闭选择器。

代码如下
这里用的View Design+vue实现的

<template>
  <div class="my-tree">
    <FormItem :label="companyName">
      <Select v-model="companyTree" :id="setTreeId" @on-change="changeOpt">
        <Option
          :key="treeId"
          :value="treeId"
          :label="treeName"
          style="height: auto"
          hidden
        />
        <Option value="ALL">全部</Option>
        <Tree :data="treeData" @on-select-change="selectTreeData" />
      </Select>
    </FormItem>
  </div>
</template>

<script>
export default {
  name: "MyTree",
  data() {
    return {
      treeData: [], //树的数据
      treeId: "", //树回显Id
      treeName: "", //树回显名称
      companyTree: "ALL"
    };
  },
  props: {
    //名字
    companyName: {
      type: String,
      default: () => {
        return "树形下拉选择框";
      }
    },
    //一个页面多个下拉框，唯一id
    setTreeId: {
      type: String,
      default: "selectTree"
    }
  },
  created() {
    this.treeData = [
      {
        title: "四川省",
        id: "sichuan",
        expand: true,
        children: [
          {
            title: "成都市",
            id: "chengdu",
            expand: true,
            children: [
              {
                title: "高新区",
                id: "gaoxin"
              },
              {
                title: "金堂",
                id: "jitang"
              }
            ]
          },
          {
            title: "资阳市",
            id: "ziyang",
            expand: true,
            children: [
              {
                title: "安岳县",
                id: "anyue"
              }
            ]
          }
        ]
      }
    ];
  },
  methods: {
    //选择树
    selectTreeData(val) {
        if (!val[0].id) {
          return;
        }
        this.treeName = val[0].title;
        this.treeId = val[0].id;
        this.companyTree = val[0].id;
  
      console.log(val);
      this.$emit("treeVal", val);

      //下拉选择后关闭选择的树
      let selectTree = document.getElementById(`${this.setTreeId}`);
      selectTree.lastElementChild.style.display = "none";
    },
    changeOpt(val) {
      this.$emit("treeVal", val);
    }
  }
};
</script>

<style lang='less' scoped>
.my-tree {
}
</style>
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看打印结果

最后父组件用@treeVal方法接接收传过来的值就可以啦