vue3 多级数据下拉选择组件

若依的下拉组件太复杂，我改了一下，希望对大家有帮助，基于 element-plus el-tree-select 组件：

举个栗子，TreeSelect.vue：

<template>
  <div>
    <el-tree-select
      style="width:100%"
      v-model="valueId"
      id="tree-option"
      ref="selectTree"
      :placeholder="placeholder"
      clearable
      filterable
      :accordion="accordion"
      :data="options"
      :props="objMap"
      :node-key="objMap.value"
      :expand-on-click-node="false"
      :default-expand-all="defaultExpandAll"
      ></el-tree-select>
  </div>
</template>

<script setup>

const { proxy } = getCurrentInstance();

const props = defineProps({
  defaultExpandAll:{
    type : Boolean,
    default : ()=>{ return false}
  },
  /* 配置项 */
  objMap: {
    type: Object,
    default: () => {
      return {
        value: 'id', // ID字段名
        label: 'label', // 显示名称
        children: 'children' // 子级字段名
      }
    }
  },
  /* 自动收起 */
  accordion: {
    type: Boolean,
    default: () => {
      return false
    }
  },
  /**当前双向数据绑定的值 */
  value: {
    type: [String, Number],
    default: ''
  },
  /**当前的数据 */
  options: {
    type: Array,
    default: () => []
  },
  /**输入框内部的文字 */
  placeholder: {
    type: String,
    default: ''
  }
})

const emit = defineEmits(['update:value']);
const valueId = computed({
  get: () => props.value,
  set: (val) => {
    emit('update:value', val)
  }
})
</script>

<style lang='scss' scoped>
@import "@/assets/styles/variables.module.scss";
.el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
  padding: 0;
  background-color: #fff;
  height: auto;
}

.el-select-dropdown__item.selected {
  font-weight: normal;
}

ul li .el-tree .el-tree-node__content {
  height: auto;
  padding: 0 20px;
  box-sizing: border-box;
}

:deep(.el-tree-node__content:hover),
:deep(.el-tree-node__content:active),
:deep(.is-current > div:first-child),
:deep(.el-tree-node__content:focus) {
  background-color: mix(#fff, $--color-primary, 90%);
  color: $--color-primary;
}
</style>