1.后台接口为点击加载下一级 ，传省市区id
<template><el-cascaderv-model="selectedOptions"placeholder="请选择省市区":options="cascaderData"@active-item-change="handleItemChange":props="{value: 'id',label: 'name',children: 'cities'}"></el-cascader></template><script>export default {name: 'my-provinces',data () {return {departmentOptions: [],cascaderData: [],selectedOptions: []}},methods: {getNodes (val) {let idArealet sizeAreaif (!val) {idArea = nullsizeArea = 0} else if (val.length === 1) {idArea = val[0]sizeArea = val.length // 3:一级 4:二级 6:三级} else if (val.length === 2) {idArea = val[1]sizeArea = val.length // 3:一级 4:二级 6:三级}this.$post('ibest/service/system/area/areaList', {'id': idArea}).then(response => {if (response.data && response.data.code === '00000000') {let Items = response.data.dataif (sizeArea === 0) { // 初始化 加载一级 省this.cascaderData = Items.map((value, i) => {return {id: value.id,name: value.name,cities: []}})} else if (sizeArea === 1) { // 点击一级 加载二级 市this.cascaderData.map((value, i) => {if (value.id === val[0]) {if (!value.cities.length) {value.cities = Items.map((value, i) => {return {id: value.id,name: value.name,cities: []}})}}})} else if (sizeArea === 2) { // 点击二级 加载三级 区this.cascaderData.map((value, i) => {if (value.id === val[0]) {value.cities.map((value, i) => {if (value.id === val[1]) {if (!value.cities.length) {value.cities = Items.map((value, i) => {return {id: value.id,name: value.name}})}}})}})}} else {console.log(response.data.msg)}}, error => {console.log(error)})},handleItemChange (val) {this.getNodes(val)}},mounted () {this.getNodes()}}</script>
2.效果
