elementui之el-select和el-tree的合并使用

elementui之el-select和el-tree的合并使用

效果图如下：

<template>
  <div class="content-box">
    <div class="container">
      <el-select
        v-model="selectTree"
        placeholder="请选择"
        :popper-append-to-body="false"
        multiple
        @change="selectChange"
        class="select-tree"
        style="width:500px"
      >
        <el-option :value="selectTreeValue" style="height: auto;">
          <!-- option展开高度太小，把height设置为auto就好啦 -->
          <el-tree
            :data="data"
            show-checkbox
            node-key="id"
            ref="tree"
            accordion
            highlight-current
            :props="defaultProps"
            icon-class="el-icon-arrow-down"
            @check-change="handleCheckChange"
          ></el-tree>
        </el-option>
      </el-select>
      <el-button @click="setCheckedKeys">设置</el-button>
      {{ selectTree }}
      {{ selectTreeValue }}
    </div>
  </div>
</template>

<script>
export default {
  name: 'record',
  components: {
    SelectTree
  },
  data() {
    return {
      selectTree: '',
      selectTreeValue: [],
      data: [
        {
          id: 1,
          label: '一级 1',
          children: [
            {
              id: 4,
              label: '一级 1-1'
            }
          ]
        },
        {
          id: 2,
          label: '二级 2',
          children: [
            {
              id: 5,
              label: '二级 2-1'
            },
            {
              id: 6,
              label: '二级 2-2'
            }
          ]
        },
        {
          id: 3,
          label: '三级 3',
          children: [
            {
              id: 7,
              label: '三级 3-1'
            },
            {
              id: 8,
              label: '三级 3-2',
              children: [
                {
                  id: 81,
                  label: '三级 3-2-1'
                },
                {
                  id: 82,
                  label: '三级 3-2-2'
                }
              ]
            }
          ]
        },
        {
          id: 4,
          label: '四级 1',
          children: []
        },
      ],
      defaultProps: {
        children: 'children',
        label: 'label'
      }
    }
  },
  computed: {
   
  },
  created() {},
  activated() {
  },
  methods: {
    //select框值改变时候触发的事件
    selectChange(e) {
      var arrNew = []
      var dataLength = this.selectTreeValue.length
      var eleng = e.length
      for (let i = 0; i < dataLength; i++) {
        for (let j = 0; j < eleng; j++) {
          if (e[j] === this.selectTreeValue[i].label) {
            arrNew.push(this.selectTreeValue[i])
          }
        }
      }
      this.$refs.tree.setCheckedNodes(arrNew) //设置勾选的值
    },
    handleCheckChange() {
      let res = this.$refs.tree.getCheckedNodes(true, true) //这里两个true，1. 是否只是叶子节点 2. 是否包含半选节点（就是使得选择的时候不包含父节点）
      let arrLabel = []
      let arr = []
      res.forEach(item => {
        arrLabel.push(item.label)
        arr.push(item)
      })
      this.selectTreeValue = arr
      this.selectTree = arrLabel
      console.log('arr:' + JSON.stringify(arr))
      console.log('arrLabel:' + arrLabel)
    },
    // 设置默认选中的tree回显
    setCheckedKeys() {
      this.$refs.tree.setCheckedKeys([7, 81, 82])
    }
  },
  mounted() {}
}
</script>

<style lang="scss">
.select-drop-down {
  position: relative;
}
.select-tree {
  .el-select-dropdown__item {
    padding: 0 10px;
  }
  .el-select-dropdown__item.hover,
  .el-select-dropdown__item:hover {
    background: transparent;
  }
  .el-tree-node__content {
    position: relative;
    // padding: 0 10px !important;
    // background-color: #f0f0fd;
  }
  // .el-tree-node__children {
  //   padding-left: 16px;
  //   background: #ccc !important;
  // }
  .expanded.el-tree-node__expand-icon.el-icon-arrow-down {
    position: absolute;
    top: 0;
    right: 0;
  }
  .el-tree-node__expand-icon {
    position: absolute;
    top: 0;
    right: 0;
  }
  .el-tree-node__expand-icon.expanded{
    transform: rotate(-180deg);
  }
  // .el-tree-node {
  //   padding: 0 10px;
  // }
}

</style>