本文介绍了vue + elementUI实现省市县三级联动的方法示例，分享给大家，具体如下：
1、首先需要准备省市县json文件，网上有很多可以下载。项目中使用的city.json数据是这样的格式：
[
{
"value": "110000",
"label": "北京市",
"children": [
{
"value": "110000",
"label": "北京市",
"children": [
{
"value": "110101",
"label": "东城区"
},
{
"value": "110102",
"label": "西城区"
},
{
"value": "110105",
"label": "朝阳区"
},
{
"value": "110106",
"label": "丰台区"
},
{
"value": "110107",
"label": "石景山区"
},
{
"value": "110108",
"label": "海淀区"
},
{
"value": "110109",
"label": "门头沟区"
},
{
"value": "110111",
"label": "房山区"
},
{
"value": "110112",
"label": "通州区"
},
{
"value": "110113",
"label": "顺义区"
},
{
"value": "110114",
"label": "昌平区"
},
{
"value": "110115",
"label": "大兴区"
},
{
"value": "110116",
"label": "怀柔区"
},
{
"value": "110117",
"label": "平谷区"
},
{
"value": "110118",
"label": "密云区"
},
{
"value": "110119",
"label": "延庆区"
}
]
}
]
},
{
"value": "120000",
"label": "天津市",
"children": [
{
"value": "120000",
"label": "天津市",
"children": [
{
"value": "120101",
"label": "和平区"
},
......
2、创建一个组件开始写代码
<template>
<div class="linkage">
<div>
<el-select v-model="selectProvince" filterable size="small" @change="selectProvinceFun($event)" placeholder="请选择省份">
<el-option value="" label="请选择省份"></el-option>
<el-option :value="item" :label="item.label" v-for="(item, index) in city" :key="index"></el-option>
</el-select>
</div>
<div>
<el-select v-model="selectCity" filterable size="small" @change="selectCityFun($event)" placeholder="请选择城市">
<el-option value="" label="请选择城市"></el-option>
<el-option :value="item" :label="item.label" v-for="(item, index) in cityList" :key="index"></el-option>
</el-select>
</div>
<div>
<el-select v-model="selectArea" filterable size="small" @change="selectAreaFun($event)" placeholder="请选择区县">
<el-option value="" label="请选择区县"></el-option>
<el-option :value="item" :label="item.label" v-for="(item, index) in areaList" :key="index"></el-option>
</el-select>
</div>
</div>
</template>
<script>
import city from '@/assets/json/city.json'
export default {
name: 'linkage',
data () {
return {
// 整个省市县数据
city: city,
// 被选中的市数据
cityList: [],
// 被选中的县数据
areaList: [],
selectProvince: {},
selectCity: {},
selectArea: {}
}
},
mounted () {
},
methods: {
// 省份 市 县联动
selectProvinceFun (event) {
console.log(event)
if (event) {
this.cityList = event.children
} else {
this.cityList = []
}
this.areaList = []
this.$emit('getLawyerListInfo', [event.label, 'province'])
},
selectCityFun (event) {
console.log(event)
if (event) {
this.areaList = event.children
} else {
this.areaList = []
}
this.$emit('getLawyerListInfo', [event.label, 'city'])
},
selectAreaFun (event) {
console.log(event)
this.$emit('getLawyerListInfo', [event.label, 'area'])
}
}
}
</script>
<style lang="scss" scoped>
.linkage {
display: flex;
div {
margin-right: 5px;
}
}
</style>
总结：整个过程很简单，就是在选中省的时候获取他的所有children节点数据（市）在选择市的时候获取她的所有children节点数据（区县）