基于vue+element+select实现的自定义控件selectTree

基于vue+element+select实现的自定义控件selectTree，效果如图：

单选：

输出值："tree":3

多选：

 输出值："tree":[2,3]

代码如下：

<template>
  <el-select
    ref="selectTree"
    v-model="value"
    :placeholder="placeholder"
    v-bind="$attrs"
    clearable
    @remove-tag="removeTag"
  >
    <el-option value="" />
    <el-tree
      ref="treeOption"
      :show-checkbox="this.$attrs.multiple"
      default-expand-all
      highlight-current
      accordion
      node-key="id"
      check-on-click-node
      :data="options"
      :props="defaultProps"
      @check="checkNode"
    />
  </el-select>
</template>

<script>
export default {
  name: 'CisTreeSelect',
  props: {
    placeholder: {
      type: String,
      default: () => {
        return '请选择'
      }
    },
    // 节点数据
    options: {
      type: Array, // 必须是树形结构的对象数组
      default: () => {
        return []
      }
    },
    // 设置lable value属性
    defaultProps: {
      type: Object,
      default: () => {
        return {
          value: 'id', // ID字段名
          label: 'label', // 显示名称
          children: 'childList' // 子级字段名
        }
      }
    },
    // 默认勾选的节点
    defaultCheckNodes: {
      type: Array, // 已经分配的资源
      default: () => {
        return []
      }
    }
  },
  data() {
    return {
      value: []
    }
  },
  methods: {
    // 删除tag时，
    removeTag(val) {
      // 取消勾选
      const treeOption = this.$refs.treeOption
      treeOption.setChecked(val, false, false)

      // 重新给控件赋值
      this.$emit('input', this.value)
    },
    // 勾选节点，
    checkNode(node, treeStatus) {
      node.value = node.id
      node.currentLabel = node.label
      // 给selectTree的cachedOptions赋值 设置node.label，使用页面显示label值
      const selectTree = this.$refs.selectTree
      selectTree.cachedOptions.push(node)
      selectTree.handleOptionSelect(node, true)

      this.$emit('input', this.value)
    }
  }
}
</script>

<style scoped>
  /* 去除tree上面的一行高度 */
    .el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
        height: auto;
        padding: 0;
    }

</style>

使用方法：

<template>
  <div>
    <div>
      <el-form>
        <el-form-item label="下拉树" label-width="100px" class="item">
          <select-tree v-model="selectData.tree" :options="options" :multiple="true" />
        </el-form-item>
        <el-form-item>
          <el-button type="primary" @click="onSubmit">检索</el-button>
          <el-button>重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
import SelectTree from '../SelectTree'
export default {
  name: 'DragSelect',
  components: { SelectTree },
  props: {
    value: {
      type: Array,
      required: true
    }
  },
  data() {
    return {
      selectData: {
        tree: null
      },
      options: [{ id: 1,
        label: '北京市',
        childList: [{ id: 2, label: '朝阳区' }, { id: 3, label: '东城区' }]
      }, { id: 4,
        label: '黑龙江',
        childList: [{ id: 5, label: '哈尔滨' }, { id: 6, label: '佳木斯' }]
      }, { id: 7,
        label: '辽宁省',
        childList: [{ id: 8, label: '沈阳市' }, { id: 9, label: '大连市' }]
      }
      ]
    }
  },

  mounted() {

  },
  methods: {
    handleRemoveTag(val) {
      console.dir(val)
    },
    onSubmit() {
      console.dir(JSON.stringify(this.selectData))
    }
  }
}
</script>