vue: 使用下拉树组件@riophae/vue-treeselect

前言: 在vue中, 因为element-ui 2.X是没有tree-select组件的，到了element-plus就有了 @riophae/vue-treeselect是一个基于 Vue.js 的树形选择器组件，可以用于选择树形结构的数据。它支持多选、搜索、异步加载等功能，可以自定义选项的样式和模板。该组件易于使用和扩展，适用于各种类型的项目。

1. 安装第三方包

npm i @riophae/vue-treeselect

2. 导入并注册

import Treeselect from '@riophae/vue-treeselect'
import '@riophae/vue-treeselect/dist/vue-treeselect.css'
 
export default {
  components: { Treeselect } 
}

3. 基本使用

<template>
  <div class="main">
    <div class="tree">
      <Treeselect 
        v-model="value"
        :options="options"
        :placeholder="'请选择人员'"
        :normalizer="tenantIdnormalizer"
        :multiple="true"
        @input="treeSelectInput"
        @select="treeSelectChange"
        @deselect="treeSelectDeselect"
        @search-change="treeSelectSearch"
        @open="treeSelectOpen"
        @close="treeSelectClose"
      />
    </div>
  </div>
</template>
<script>
import Treeselect from '@riophae/vue-treeselect'
import '@riophae/vue-treeselect/dist/vue-treeselect.css'
import treeData from './data/tree'
export default {
  data() {
    return {
      value: null,
      options: []
    }
  },
  components: { Treeselect },
  mounted(){
    // 延迟模拟请求数据
    setTimeout(() => {
      this.options = treeData
      this.value = [111, 113] // 测试回显操作
    }, 300)
  },
  methods:{
    // 选中触发（第一次回显的时候会触发，清除值的时候会触发, value值为undefined） input事件用于v-model双向绑定组件更新父组件值
    treeSelectInput(value, instanceId) {
      console.log(value, 'input事件')
      console.log(this.value, 'this.value -- input') // 这个不需要 延迟
    },
    // 选中触发（清除值的时候不会触发）
    treeSelectChange(raw, instanceId) {
      console.log(raw, '当前的对象')
      setTimeout(() => { // 如果用到this.value 需要setTimeout延迟一下拿到最新的值
        console.log(this.value, 'this.value -- select')
      })
    },
    // 移除选项时触发 当设置multiple为true时生效  raw为当前移除的对象
    treeSelectDeselect(raw, instanceId) {
      console.log(raw, 'deselect-->>')
    },
    // 搜索
    treeSelectSearch(searchQuery, instanceId) {
      console.log(searchQuery, '当前搜索的值')
    },
    // 展开触发
    treeSelectOpen(instanceId) {
      console.log('展开了')
    },
    // 关闭触发
    treeSelectClose(value, instanceId) {
      console.log(value, '当前的value值')
    },
    // 字段默认 id label 用于规范化数据源
    tenantIdnormalizer(node, instanceId) {
      if (node.children && !node.children.length) {
        delete node.children
      }
      return {
        id: node.id,
        label: node.title,
        children: node.children
      }
    }
  }
}
</script>
<style scoped>
.main {
  width: 100%;
  height: 100%;
  padding: 60px 0 0 200px;
}
 
.main .tree {
  width: 240px;
  height: 40px;
}
 
::v-deep .vue-treeselect__label {
  color: #606266;
}
</style>

4. 比较全面的属性配置参考

props: {
  /**
   * 即使有禁用的选定节点，是否允许重置值
   */
  allowClearingDisabled: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 选择/取消选择祖先节点时，是否应选择/取消选中其禁用的后代
   * 和 allowClearingDisabled 一起使用
   */
  allowSelectingDisabledDescendants: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 菜单是否应始终打开
   */
  alwaysOpen: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 是否将菜单加到body上
   */
  appendToBody: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 是否启用异步搜索模式
   */
  async: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 是否自动将组件集中在装载上？
   */
  autoFocus: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 装载时自动加载根选项。当设置为“false”时，打开菜单时将加载根选项。
   */
  autoLoadRootOptions: {
    type: Boolean,
    default: true,
  },
 
  /**
   * 当用户取消选择一个节点时，会自动取消选择其祖先。仅适用于平面模式。
   */
  autoDeselectAncestors: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 当用户取消选择节点时，会自动取消选择其子节点。仅适用于平面模式。
   */
  autoDeselectDescendants: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 当用户选择一个节点时，会自动选择其祖先。仅适用于平面模式。
   */
  autoSelectAncestors: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 当用户选择一个节点时，会自动选择其子节点。仅适用于平面模式。
   */
  autoSelectDescendants: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 如果没有文本输入，按退格键是否删除最后一项。
   */
  backspaceRemoves: {
    type: Boolean,
    default: true,
  },
 
  /**
   * 在清除所有输入字段之前进行处理的函数。
   * 返回“false”以防止清除值
   * @type {function(): (boolean|Promise<boolean>)}
   */
  beforeClearAll: {
    type: Function,
    default: constant(true),
  },
 
  /**
   * 在叶节点之前显示分支节点？
   */
  branchNodesFirst: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 是否应该缓存每个搜索请求的结果？
   */
  cacheOptions: {
    type: Boolean,
    default: true,
  },
 
  /**
   * 是否显示重置值的“×”按钮？
   */
  clearable: {
    type: Boolean,
    default: true,
  },
 
  /**
   * 清楚文本，multiple为true时
   */
  clearAllText: {
    type: String,
    default: 'Clear all',
  },
 
  /**
   * 选择后是否清除搜索输入。
   * 仅当“multiple”为“true”时使用。
   * 对于单选模式，无论道具值如何，它总是**在选择一个选项后清除输入。
   */
  clearOnSelect: {
    type: Boolean,
    default: false,
  },
 
  /**
   * “×”按钮的标题。
   */
  clearValueText: {
    type: String,
    default: 'Clear value',
  },
 
  /**
   * 选择选项后是否关闭菜单？
   * 仅当“multiple”为“true”时使用。
   */
  closeOnSelect: {
    type: Boolean,
    default: true,
  },
 
  /**
   * 加载时应自动展开多少级别的分支节点。
   * 设置Infinity以使所有分支节点在默认情况下展开。
   */
  defaultExpandLevel: {
    type: Number,
    default: 0,
  },
 
  /**
   * 在用户开始搜索之前要显示的默认选项集。用于异步搜索模式。
   * 当设置为“true”时，将自动加载作为空字符串的搜索查询结果。
   * @type {boolean|node[]}
   */
  defaultOptions: {
    default: false,
  },
 
  /**
   * 如果没有文本输入，按delete键是否删除最后一项。
   */
  deleteRemoves: {
    type: Boolean,
    default: true,
  },
 
  /**
   * 用于连接隐藏字段值的多个值的分隔符。
   */
  delimiter: {
    type: String,
    default: ',',
  },
 
  /**
   * 仅显示与搜索值直接匹配的节点，不包括其祖先。
   *
   * @type {Object}
   */
  flattenSearchResults: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 是否阻止选择分支节点？
   */
  disableBranchNodes: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 禁用控制？
   */
  disabled: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 是否禁用模糊匹配功能？
   */
  disableFuzzyMatching: {
    type: Boolean,
    default: false,
  },
 
  /**
   *是否启用平面模式。非平面模式（默认）是指： 
   *   - 每当检查分支节点时，它的所有子节点也将被检查
   *   - 每当一个分支节点检查了所有子节点时，该分支节点本身也会被检查
   * 设置“true”以禁用此机制
   */
  flat: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 将以所有事件作为最后一个参数进行传递。
   * 有助于识别事件的起源。
  */
  instanceId: {
    // Add two trailing "$" to distinguish from explictly specified ids.
    default: () => `${instanceId++}$$`,
    type: [String, Number],
  },
 
  /**
   * Joins multiple values into a single form field with the `delimiter` (legacy mode).
   * 使用“分隔符”将多个值合并到一个表单字段中（传统模式）。
  */
  joinValues: {
    type: Boolean,
    default: false,
  },
 
  /**
   * 限制所选选项的显示。
   * 其余部分将隐藏在limitText字符串中。
   */
  limit: {
    type: Number,
    default: Infinity,
  },
 
  /**
   * Function that processes the message shown when selected elements pass the defined limit.
   * @type {function(number): string}
   */
  limitText: {
    type: Function,
    default: function limitTextDefault(count) { // eslint-disable-line func-name-matching
      return `and ${count} more`
    },
  },
 
  /**
   * Text displayed when loading options.
   */
  loadingText: {
    type: String,
    default: 'Loading...',
  },
 
  /**
   * Used for dynamically loading options.
   * @type {function({action: string, callback: (function((Error|string)=): void), parentNode: node=, instanceId}): void}
   */
  loadOptions: {
    type: Function,
  },
 
  /**
   * Which node properties to filter on.
   */
  matchKeys: {
    type: Array,
    default: constant(['label']),
  },
 
  /**
   * Sets `maxHeight` style value of the menu.
   */
  maxHeight: {
    type: Number,
    default: 300,
  },
 
  /**
   * Set `true` to allow selecting multiple options (a.k.a., multi-select mode).
   */
  multiple: {
    type: Boolean,
    default: false,
  },
 
  /**
   * Generates a hidden <input /> tag with this field name for html forms.
   */
  name: {
    type: String,
  },
 
  /**
   * Text displayed when a branch node has no children.
   */
  noChildrenText: {
    type: String,
    default: 'No sub-options.',
  },
 
  /**
   * Text displayed when there are no available options.
   */
  noOptionsText: {
    type: String,
    default: 'No options available.',
  },
 
  /**
   * Text displayed when there are no matching search results.
   */
  noResultsText: {
    type: String,
    default: 'No results found...',
  },
 
  /**
   * Used for normalizing source data.
   * @type {function(node, instanceId): node}
   */
  normalizer: {
    type: Function,
    default: identity,
  },
 
  /**
   * By default (`auto`), the menu will open below the control. If there is not
   * enough space, vue-treeselect will automatically flip the menu.
   * You can use one of other four options to force the menu to be always opened
   * to specified direction.
   * Acceptable values:
   *   - `"auto"`
   *   - `"below"`
   *   - `"bottom"`
   *   - `"above"`
   *   - `"top"`
   */
  openDirection: {
    type: String,
    default: 'auto',
    validator(value) {
      const acceptableValues = ['auto', 'top', 'bottom', 'above', 'below']
      return includes(acceptableValues, value)
    },
  },
 
  /**
   * Whether to automatically open the menu when the control is clicked.
   */
  openOnClick: {
    type: Boolean,
    default: true,
  },
 
  /**
   * Whether to automatically open the menu when the control is focused.
   */
  openOnFocus: {
    type: Boolean,
    default: false,
  },
 
  /**
   * Array of available options.
   * @type {node[]}
   */
  options: {
    type: Array,
  },
 
  /**
   * Field placeholder, displayed when there's no value.
   */
  placeholder: {
    type: String,
    default: 'Select...',
  },
 
  /**
   * Applies HTML5 required attribute when needed.
   */
  required: {
    type: Boolean,
    default: false,
  },
 
  /**
   * Text displayed asking user whether to retry loading children options.
   */
  retryText: {
    type: String,
    default: 'Retry?',
  },
 
  /**
   * Title for the retry button.
   */
  retryTitle: {
    type: String,
    default: 'Click to retry',
  },
 
  /**
   * Enable searching feature?
   */
  searchable: {
    type: Boolean,
    default: true,
  },
 
  /**
   * Search in ancestor nodes too.
   */
  searchNested: {
    type: Boolean,
    default: false,
  },
 
  /**
   * Text tip to prompt for async search.
   */
  searchPromptText: {
    type: String,
    default: 'Type to search...',
  },
 
  /**
   * Whether to show a children count next to the label of each branch node.
   */
  showCount: {
    type: Boolean,
    default: false,
  },
 
  /**
   * Used in conjunction with `showCount` to specify which type of count number should be displayed.
   * Acceptable values:
   *   - "ALL_CHILDREN"
   *   - "ALL_DESCENDANTS"
   *   - "LEAF_CHILDREN"
   *   - "LEAF_DESCENDANTS"
   */
  showCountOf: {
    type: String,
    default: ALL_CHILDREN,
    validator(value) {
      const acceptableValues = [ALL_CHILDREN, ALL_DESCENDANTS, LEAF_CHILDREN, LEAF_DESCENDANTS]
      return includes(acceptableValues, value)
    },
  },
 
  /**
   * Whether to show children count when searching.
   * Fallbacks to the value of `showCount` when not specified.
   * @type {boolean}
   */
  showCountOnSearch: null,
 
  /**
   * In which order the selected options should be displayed in trigger & sorted in `value` array.
   * Used for multi-select mode only.
   * Acceptable values:
   *   - "ORDER_SELECTED"
   *   - "LEVEL"
   *   - "INDEX"
   */
  sortValueBy: {
    type: String,
    default: ORDER_SELECTED,
    validator(value) {
      const acceptableValues = [ORDER_SELECTED, LEVEL, INDEX]
      return includes(acceptableValues, value)
    },
  },
 
  /**
   * Tab index of the control.
   */
  tabIndex: {
    type: Number,
    default: 0,
  },
 
  /**
   * The value of the control.
   * Should be `id` or `node` object for single-select mode, or an array of `id` or `node` object for multi-select mode.
   * Its format depends on the `valueFormat` prop.
   * For most cases, just use `v-model` instead.
   * @type {?Array}
   */
  value: null,
 
  /**
   * Which kind of nodes should be included in the `value` array in multi-select mode.
   * Acceptable values:
   *   - "ALL" - Any node that is checked will be included in the `value` array
   *   - "BRANCH_PRIORITY" (default) - If a branch node is checked, all its descendants will be excluded in the `value` array
   *   - "LEAF_PRIORITY" - If a branch node is checked, this node itself and its branch descendants will be excluded from the `value` array but its leaf descendants will be included
   *   - "ALL_WITH_INDETERMINATE" - Any node that is checked will be included in the `value` array, plus indeterminate nodes
   */
  valueConsistsOf: {
    type: String,
    default: BRANCH_PRIORITY,
    validator(value) {
      const acceptableValues = [ALL, BRANCH_PRIORITY, LEAF_PRIORITY, ALL_WITH_INDETERMINATE]
      return includes(acceptableValues, value)
    },
  },
 
  /**
   * Format of `value` prop.
   * Note that, when set to `"object"`, only `id` & `label` properties are required in each `node` object in `value` prop.
   * Acceptable values:
   *   - "id"
   *   - "object"
   */
  valueFormat: {
    type: String,
    default: 'id',
  },
 
  /**
   * z-index of the menu.
   */
  zIndex: {
    type: [Number, String],
    default: 999,
  }
}

5. 插件的的方法配置

@input // // 选中触发（第一次回显的时候会触发，清除值的时候会触发, value值为undefined） input事件用于v-model双向绑定组件更新父组件值
 
@select // 选中触发（清除值的时候不会触发）
 
@deselect // 移除选项时触发 当设置multiple为true时生效  raw为当前移除的对象
 
@search-change // 搜索触发（输入框输入 值改变时）
 
@open // 展开时触发
 
@close // 关闭时触发

6. 最终的效果