專案中使用 Treeselect 時，需要獲取選項的變化從而觸發別的事件，所以需要監聽Treeselect 所選擇的值。

我使用了watch 來監聽 treeselect 繫結的 model ，如果 model 的值發生變化就觸發 currDeptChange 事件。

<el-form-item prop="deptId"
          :label="$t('deviceManage.device.table.deptId')+':'">
    <treeselect :options="deptTree"
          :normalizer="normalizer"
          v-model="formData.deptId"
          :placeholder="$t('deviceManage.device.dlg.deptId')">
    </treeselect>
</el-form-item>

監聽 Treeselect 選擇項的改變

watch: {
  // 監聽deptId
  'formData.deptId': 'currDeptChange'
},methods: {
  currDeptChange(val) {
   console.log('currDeptChange',val)
   if (val) {
    this.queryStaff()
   }
  },queryStaff() {}
}

補充知識：vue Treeselect 樹形下拉框 : 獲取選中節點的ids和lables

API: https://vue-treeselect.js.org/#events

1.ids: 即value

1.lable: 需要用到方法：@select(node,instanceId) 和 @deselect(node,instanceId)

<template>
<treeselect ref="DRHA_EFaultModeTree"
       v-model="DRHA_EFaultModeTree_value"
       :multiple="true" 
       :options="DRHA_EFaultModeTree_options"
       :flat="true"
       :show-count="true"
       :disable-branch-nodes="true"
       :searchable="false"
       @select="DRHA_EFaultModeTree_handleSelect"
       @deselect="DRHA_EFaultModeTree_handleDeSelect"
       placeholder=" 請選擇..."/>
 
 <p>lables：{{DRHA_EFaultModeTree_lables}}</p>
 <p>ids:{{DRHA_EFaultModeTree_value}}</p>
 
</template>
 
<script>
 // import the component
 import Treeselect from '@riophae/vue-treeselect'
 // import the styles
 import '@riophae/vue-treeselect/dist/vue-treeselect.css' 
 
 export default {
  components: { Treeselect },data() {
   return {
    
    DRHA_EFaultModeTree_value: null,DRHA_EFaultModeTree_lables: [],DRHA_EFaultModeTree_options: [ {
     id: '1',label: 'Fruits',children: [ {
      id: '1-1',label: 'Apple ?',isNew: true,},{
      id: '1-2',label: 'Grapes ?',{
      id: '1-3',label: 'Pear ?',{
      id: '1-4',label: 'Strawberry ?',{
      id: 'watermelon',label: 'Watermelon ?',} ],{
     id: 'vegetables',label: 'Vegetables',children: [ {
      id: 'corn',label: 'Corn ?',{
      id: 'carrot',label: 'Carrot ?',{
      id: 'eggplant',label: 'Eggplant ?',{
      id: 'tomato',label: 'Tomato ?',};
  },mounted: function(){
    
  },methods: {
    DRHA_EFaultModeTree_handleSelect(node,instanceId){
    console.log("Select");
    this.DRHA_EFaultModeTree_lables.push(node.label);
   },DRHA_EFaultModeTree_handleDeSelect(node,instanceId){
    console.log("DeSelect");
    for (let i = 0;i<this.DRHA_EFaultModeTree_lables.length;i++){
     if(node.label == this.DRHA_EFaultModeTree_lables[i]){
      this.DRHA_EFaultModeTree_lables.splice(i,1);
     }
    }
   },}
 };
</script>

以上這篇vue 監聽 Treeselect 選擇項的改變操作就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支援我們。