关于vue-treeselect绑值、回显等常见问题的总结

import ElTreeSelect from ‘el-tree-select'
import Treeselect from ‘@riophae/vue-treeselect'
import ‘@riophae/vue-treeselect/dist/vue-treeselect.css'
Vue.use(ElTreeSelect)
Vue.component(‘TreeSelect', Treeselect)

<el-form-item label="上级部门:">
              <TreeSelect
                :value="form.astdeptId"
                :options="zoneCodeOptions"
                clearable            
                no-options-text="暂无可用选项"
                :append-to-body="true"
                :normalizer="tenantIdnormalizer"
                open-direction="bottom"
                placeholder="请选择父级节点"
                @select="node => tenantIdHandleSelect(node)"
              >
                <div slot="option-label" slot-scope="{ node }" style="white-space: nowrap; font-size: 14px">
                  {{ node.raw.name ? node.raw.name : '' }}
                </div>
                <div slot="value-label" slot-scope="{ node }">{{ node.raw.name ? node.raw.name : '' }}</div>
              </TreeSelect>
            </el-form-item>

 tenantIdnormalizer(node) {
  
      if (node.children && !node.children.length) {
        delete node.children
      }
      return {
        id: node.astdeptId,
        label: node.name,
        children: node.children,
      }
    },

    tenantIdHandleSelect(node) {
      this.form.astdeptId = node.astdeptId
      this.form.name = node.name
    },

{
id: ‘id',
label: ‘label',
children: ‘children',
}

<template>
  <div class="tree-container">
    <el-select
      ref="singleTree"
      v-model="singleSelectTreeVal"
      class="vab-tree-select"
      clearable
      :placeholder="placeholder"
      popper-class="select-tree-popper"
      value-key="id"
      @clear="selectTreeClearHandle('single')"
    >
      <el-option :value="singleSelectTreeKey">
        <el-tree
          id="singleSelectTree"
          ref="singleSelectTree"
          :current-node-key="singleSelectTreeKey"
          :data="selectTreeData"
          :default-expanded-keys="selectTreeDefaultSelectedKeys"
          :highlight-current="true"
          :node-key="selectTreeDefaultProps.id"
          :props="selectTreeDefaultProps"
          @node-click="selectTreeNodeClick"
        >
          <template #defalut="{ node }" class="vab-custom-tree-node">
            <span class="vab-tree-item">{{ node.label }}</span>
          </template>
        </el-tree>
      </el-option>
    </el-select>
  </div>
</template>

<script>
  import { onBeforeMount, onMounted, reactive, toRefs, watch } from 'vue'
  export default {
    name: 'VabSingleSelectTree',
    props: {
      //这里是绑定参数
      modelValue: {
        type: Number,
        default: undefined,
      },
      //这里是数组
      options: {
        type: Array,
        default: undefined,
      },
      //placeholder
      placeholder: {
        type: String,
        default: '',
      },
      //这里是转换方法
      normalizer: {
        type: Object,
        default: undefined,
      },
    },
    emits: ['update:modelValue'],
    // { emit }
    setup(props, { emit }) {
      //$emit('update:modelValue', $event.target.value)
      const state = reactive({
        singleSelectTree: null,
        singleTree: null,
        singleSelectTreeKey: props.modelValue,
        singleSelectTreeVal: null,
        selectTreeData: props.options,
        selectTreeDefaultSelectedKeys: [],
        selectTreeDefaultProps: props.normalizer,
      })
      onBeforeMount(() => {
        defaultNormalizer()
      })
      //首次加载
      onMounted(() => {
        initialize()
      })
      watch(props, (newValue) => {
        //这里props里的值不会自动赋值给state中常量，只有第一次过来的时候才会赋值之后需要手动赋值
        state.singleSelectTreeKey = newValue.modelValue
        state.selectTreeData = newValue.options
        initialize()
      })
      //防止不写Normalizer报错
      const defaultNormalizer = () => {
        if (!state.selectTreeDefaultProps) {
          state.selectTreeDefaultProps = {
            id: 'id',
            label: 'label',
            children: 'children',
          }
        }
      }
      //初始化
      const initialize = () => {
        if (state.singleSelectTreeKey != null) {
          state['singleSelectTree'].setCurrentKey(state.singleSelectTreeKey) // 设置默认选中
          let node = state['singleSelectTree'].getNode(
            state.singleSelectTreeKey
          )
          state.singleSelectTreeVal =
            node.data[state.selectTreeDefaultProps['label']]
          state.singleSelectTreeKey =
            node.data[state.selectTreeDefaultProps['id']]
        } else {
          selectTreeClearHandle()
        }
      }
      // 清除单选树选中
      const selectTreeClearHandle = () => {
        state.selectTreeDefaultSelectedKeys = []
        clearSelected()
        emit('update:modelValue', null)
        state.singleSelectTreeVal = ''
        state.singleSelectTreeKey = null
        state['singleSelectTree'].setCurrentKey(null) // 设置默认选中
      }
      const clearSelected = () => {
        const allNode = document.querySelectorAll(
          '#singleSelectTree .el-tree-node'
        )
        allNode.forEach((element) => element.classList.remove('is-current'))
      }
      const selectTreeNodeClick = (data) => {
        state.singleSelectTreeVal = data[state.selectTreeDefaultProps['label']]
        state.singleSelectTreeKey = data[state.selectTreeDefaultProps['id']]
        emit('update:modelValue', state.singleSelectTreeKey)
        state['singleTree'].blur()
        //data
        // if (data.rank >= this.selectLevel) {
        //
        // }
      }
      return {
        ...toRefs(state),
        selectTreeClearHandle,
        selectTreeNodeClick,
        defaultNormalizer,
        initialize,
      }
    },
  }
</script>
<style scoped></style>

/* .vab-hey-message */
    .vab-hey-message {
      @mixin vab-hey-message {
        min-width: 246px;
        padding: 15px;
        background-color: $base-color-white;
        border-color: $base-color-white;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.15);
        .el-message__content {
          padding-right: $base-padding;
          color: #34495e;
        }
        .el-icon-close {
          color: #34495e;
          &:hover {
            opacity: 0.8;
          }
        }
      }