基于el-select和el-tree封装的可搜索树形选择器-SelectTree组件

搜索

1、组件封装SelectTree

<template>
  <!-- 下拉树形组件 -->
  <div class="SelectTree">
    <el-select :value="valueTitle" :clearable="clearable" @clear="clearHandle" style="width:100%">
      <el-input class="selectInput" :placeholder="placeholder" v-model="filterText" clearable>
      </el-input>

      <el-option :value="valueTitle" :label="valueTitle" class="options">
        <el-tree id="tree-option" ref="selectTree" :accordion="accordion" :data="options" :props="props"
          :node-key="props.value" :default-expanded-keys="defaultExpandedKey" :filter-node-method="filterNode"
          @node-click="handleNodeClick">
        </el-tree>
      </el-option>
    </el-select>
  </div>
</template>

<script>
export default {
  name: "",
  props: {
    /* 配置项 */
    props: {
      type: Object,
      default: () => {
        return {
          value: "id", // ID字段名
          label: "title", // 显示名称
          children: "children" // 子级字段名
        }
      }
    },
    /* 选项列表数据(树形结构的对象数组) */
    options: {
      type: Array,
      default: () => {
        return []
      }
    },
    /* 初始值 */
    value: {
      type: Number,
      default: () => {
        return null
      }
    },
    /* 可清空选项 */
    clearable: {
      type: Boolean,
      default: () => {
        return true
      }
    },
    /* 自动收起 */
    accordion: {
      type: Boolean,
      default: () => {
        return true
      }
    },
    placeholder: {
      type: String,
      default: () => {
        return "检索关键字"
      }
    }
  },
  data() {
    return {
      filterText: "",
      valueId: this.value, // 初始值
      valueTitle: "", //选中显示的label值
      defaultExpandedKey: []
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.initHandle()
    })
  },
  methods: {
    // 初始化值
    initHandle() {
      console.log("初始值11", this.valueId)
      console.log("初始数组", this.options)
      if (this.valueId && this.options.length > 0) {
        console.log(this.$refs.selectTree.getNode(this.valueId))
        this.valueTitle = this.$refs.selectTree.getNode(this.valueId).data[
          this.props.label
        ] // 初始化显示
        console.log(this.valueTitle)
        this.$refs.selectTree.setCurrentKey(this.valueId) // 设置默认选中
        this.defaultExpandedKey = [this.valueId] // 设置默认展开
      } else {
        this.$refs.selectTree.setCurrentKey()
        this.valueTitle = null
      }
      this.initScroll()
    },
    // 初始化滚动条
    initScroll() {
      this.$nextTick(() => {
        let scrollWrap = document.querySelectorAll(
          ".el-scrollbar .el-select-dropdown__wrap"
        )[0]
        let scrollBar = document.querySelectorAll(
          ".el-scrollbar .el-scrollbar__bar"
        )
        scrollWrap.style.cssText =
          "margin: 0px; max-height: none; overflow: hidden;"
        scrollBar.forEach(ele => (ele.style.width = 0))
      })
    },
    // 切换选项
    handleNodeClick(node) {
      this.valueTitle = node[this.props.label]
      this.valueId = node[this.props.value]
      this.$emit("getValue", this.valueId + this.valueTitle)
      this.$emit("getIdAndName", this.valueId + "-" + this.valueTitle)
      this.defaultExpandedKey = []
    },
    // 清除选中
    clearHandle() {
      this.valueTitle = ""
      this.valueId = null
      this.defaultExpandedKey = []
      this.clearSelected()
      this.$emit("getValue", null)
      this.$emit("getIdAndName", null)
    },
    /* 清空选中样式 */
    clearSelected() {
      let allNode = document.querySelectorAll("#tree-option .el-tree-node")
      allNode.forEach(element => element.classList.remove("is-current"))
    },
    filterNode(value, data) {
      // console.log(value, data)
      if (!value) return true
      return data[this.props.label].indexOf(value) !== -1
    }
  },
  watch: {
    value() {
      this.valueId = this.value
      this.initHandle()
    },
    filterText(val) {
      this.$refs.selectTree.filter(val)
    }
  }
}
</script>

<style scoped>
.el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
  height: auto;
  max-height: 274px;
  padding: 0;
  overflow: hidden;
  overflow-y: auto;
}
.el-select-dropdown__item.selected {
  font-weight: normal;
}
ul li >>> .el-tree .el-tree-node__content {
  height: auto;
  padding: 0 20px;
}
.el-tree-node__label {
  font-weight: normal;
}
.el-tree >>> .is-current .el-tree-node__label {
  color: #409eff;
  font-weight: 700;
}
.el-tree >>> .is-current .el-tree-node__children .el-tree-node__label {
  color: #606266;
  font-weight: normal;
}
.selectInput {
  padding: 0 5px;
  box-sizing: border-box;
}
</style>

2使用组件SelectTree

<template>
  <div class='test'>
    <el-form-item label="申请部门" prop="applyDepartmentId">
      <!-- 调用树形下拉框组件 -->
      <SelectTree :props="departmentProps" :options="departmentList" :value="form.applyDepartmentId"
        @getIdAndName="getIdAndName($event)" />
    </el-form-item>
  </div>
</template>
<script>
import SelectTree from "@/components/common/SelectTree.vue"
export default {
  name: "",
  data() {
    return {
      form: {},
      //部门树形配置
      departmentProps: {
        // 配置项（必选）
        value: "id",
        label: "departmentName",
        children: "children"
      },
      departmentList: [] //申请部门数据 树状数据
    }
  },
  components: {
    SelectTree
  },
  methods: {
    //部门树形取值 id和name同时取
    getIdAndName(value) {
      if (value) {
        this.$set(this.form, "applyDepartmentId", +value.split("-")[0])
        this.$set(this.form, "applyDepartmentName", value.split("-")[1])
      } else {
        this.form.applyDepartmentId = null
        this.form.applyDepartmentName = null
      }
    }
  }
}
</script>