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Element树形下拉选择器封装

最后更新时间：2023-12-02 12:45:57

Tree vue Select

###一、先看效果图
![效果图](https://wxinxianyun.com/uploads/article/2020-03-27/RacFJuiDZHXFq39SvnRjGkl4UJUwGO2P6eSSXHp7.gif "效果图")
###二、组件封装
```js
<template>
  <div>
    <div class="mask" v-show="isShowSelect" @click="isShowSelect = !isShowSelect"></div>
    <el-popover placement="bottom-start" :width="width" trigger="manual"
                v-model="isShowSelect" @hide="popoverHide">
      <el-tree class="common-tree" :style="style" ref="tree" :data="data" :props="defaultProps"
               :show-checkbox="multiple"
               :node-key="nodeKey"
               :check-strictly="checkStrictly"
               default-expand-all
               :expand-on-click-node="false"
               :default-checked-keys="defaultCheckedKeys"
               :highlight-current="true"
               @node-click="handleNodeClick"
               @check-change="handleCheckChange"></el-tree>
      <el-select :style="selectStyle" slot="reference" ref="select"
                 v-model="selectedData"
                 :multiple="multiple"
                 :nodeindex = 'nodeindex'
                 clearable
                @click.native="isShowSelect =!isShowSelect" class="tree-select">
        <el-option v-for="item in options" :key="item.value" :label="item.label" :value="item.value"></el-option>
      </el-select>
    </el-popover>
  </div>
</template>
 
<script>
import {getorgantree} from '@/api/organzation';
export default {
  name: 'tree-select',
  props: {
    // 树结构数据
    data: {
      type: Array,
      default () {
        return [];
      }
    },
    defaultProps: {
      type: Object,
      default () {
        return {};
      }
    },
    // 配置是否可多选
    multiple: {
      type: Boolean,
      default () {
        return false;
      }
    },
    nodeindex:{
      type: Number,
      default () {
        return ;
      }
    },
    nodeKey: {
      type: String,
      default () {
        return 'id';
      }
    },
    // 显示复选框情况下，是否严格遵循父子不互相关联
    checkStrictly: {
      type: Boolean,
      default () {
        return false;
      }
    },
    // 默认选中的节点key数组
    checkedKeys: {
      type: Array,
      default () {
        return [];
      }
    },
    width: {
      type: Number,
      default () {
        return 420;
      }
    },
    height: {
      type: Number,
      default () {
        return 150;
      }
    }
  },
  data () {
    return {
      defaultCheckedKeys: [],
      isShowSelect: false, // 是否显示树状选择器
      options: [],
      selectedData: [], // 选中的节点
      style: {
        width: this.width + 'px', 
        height:this.height + 'px'
      },
      selectStyle: {
        width: this.width + 'px'
      },
      checkedIds: [],
      checkedData: []
    };
  },
  mounted () {
  },
  methods: {
    getTree() {
      const _this = this;
      getorgantree().then((res) => {
        if (res.data.code == 0) {
          this.data = res.data.result;
        }
      })
    },
    popoverHide () {
      if (this.multiple) {
        this.checkedIds = this.$refs.tree.getCheckedKeys(); // 所有被选中的节点的 key 所组成的数组数据
        this.checkedData = this.$refs.tree.getCheckedNodes(); // 所有被选中的节点所组成的数组数据
      } else {
        this.checkedIds = this.$refs.tree.getCurrentKey();
        this.checkedData = this.$refs.tree.getCurrentNode();
      }
      this.$emit('activezoom', this.checkedIds, this.checkedData);
    },
    // 节点被点击时的回调,返回被点击的节点数据
    handleNodeClick (data, node) {
      console.log('data',data,node)
      if (!this.multiple) {
        let tmpMap = {};
        tmpMap.value = node.key;
        tmpMap.label = node.label;
        this.options = [];
        this.options.push(tmpMap);
        this.selectedData = node.label;
        this.isShowSelect = !this.isShowSelect;
      }
    },
    // 节点选中状态发生变化时的回调
    handleCheckChange () {
      var checkedKeys = this.$refs.tree.getCheckedKeys(); // 所有被选中的节点的 key 所组成的数组数据
      this.options = checkedKeys.map((item) => {
        var node = this.$refs.tree.getNode(item); // 所有被选中的节点对应的node
        let tmpMap = {};
        tmpMap.value = node.key;
        tmpMap.label = node.label;
        return tmpMap;
      });
      this.selectedData = this.options.map((item) => {
        return item.label;
      });
    },
    setDefaultKey(keys,title){
      if (keys.length > 0) {
        this.defaultCheckedKeys = keys;
        this.selectedData = title;
      }
    },
  },
  watch: {
    isShowSelect (val) {
      // 隐藏select自带的下拉框
      this.$refs.select.blur();
    },
  }
}
</script>
 
<style scoped>
  .mask{
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    opacity: 0;
  }
  .common-tree{
    overflow: auto;
  }
</style>
<style>
  /* .tree-select .el-select__tags .el-tag .el-tag__close{
    display: none;
  }
  .tree-select .el-select__tags .el-tag .el-icon-close{
    display: none;
  } */
  .el-select{
    width: 100% !important;
  }
  .common-tree{
     width: 400px !important;
  }
</style>
```
###三、页面引入

######html
```html
<template>
  <div class='container'>
  	<SelectTree :data="leveldata" ref="levealtrees" :defaultProps="activeprops" :multiple='multiple' :nodeKey="activeprops.nodeactive" :checkedKeys="social_leval" @activezoom="activezoom" />
  </div>
</template>
```
######js
```js
<script>
import SelectTrees from '@/components/SelectTree/selecttree'
export default {
  name: 'Socialtype',
  data() {
    return {
        leveldata:[], --渲染的数据
		social_leval:[], --默认的数据值
        activeprops:{  --数据的结构参数
           children: "levelTwo",
           label: "name",
           nodeactive:'id',
        },
        multiple:false, --是否多选
    }
  },
   methods: {
   //监听所选择的值
    activezoom(checkedIds, checkedData){
	--checkedIds如果是单选的话，获取的是单个字符串，如果是多选的话，就是数组
	--checkedData，当前子节点带的对象数据，也就是下一级的数据
            this.form.activityLevel = checkedIds
            this.social_leval = checkedIds
            //this.social_leval.push(checkedIds),
        },
   }
}
</script>
```
###四、关于回显数据的问题
由于数据的异步，必须是在当前组件的数值渲染进去后，再进行操作
操作方法：
```js
this.$nextTick(() => {
	this.$refs.levealtrees.defaultCheckedKeys = []    
	this.$refs.levealtrees.setDefaultKey(ids,item.names);//获取已经设置的资源后渲染
});

--ids所选取的节点相关的父节点和当前节点的id集合
--names所选取的节点相关的父节点和当前节点的名称集合
```

Element树形下拉选择器封装

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