uniapp组件实现省市区三级联动选择

1.导入插件

先将uni-data-picker组件导入我们的HBuilder项目中，在DCloud插件市场搜索uni-data-picker

点击下载插件并导入到我们的项目中

2.组件调用

curLocation ：获取到的当前位置（省市区）

<uni-data-picker v-slot:default="{data, error, options}" :localdata="localData" popup-title="请选择省市区" @change="onchange" @nodeclick="onnodeclick"><view class="selectedAddress"><view v-if="data.length == 0 && curLocation">{{ curLocation }}</view><view v-if="data.length" class="selected"><view v-for="(item,index) in data" :key="index" class="selected-item"><text>{{item.text}} </text> </view></view><view class="addrlocation"><uni-icons type="location" color="#ec4149" size="24"></uni-icons></view></view></uni-data-picker>

data(){return {localData:[], //省市区地址curLocation: uni.getStorageSync('location_address'),}
}

3.处理我们需要的省市区数据

1）在https://gitee.com/dcloud/opendb下载省市区源数据，collection/opendb-city-china

2）下载后的数据是一组一维对象数组，接下来把这个数组处理成树形结构

在页面中引入：

const cityRows = require('@/common/opendb-master/collection/opendb-city-china/data.json')

// 省市区数据树生成get_city_tree () {let res = []if (cityRows.length) {// 递归生成res = this.handleTree(cityRows)}return res},handleTree (data, parent_code = null) {let res = []let keys = {id: 'code',pid: 'parent_code',children: 'children',text: 'name',value: 'code'}let oneItemDEMO = {text: '',value: '',children: []}let oneItem = {}// 循环for (let index in data) {// 判断if (parent_code === null) {// 顶级菜单 - 省if (!data[index].hasOwnProperty( keys.pid ) || data[index][keys.pid] == parent_code) {// 不存在parent_code，或者已匹配oneItem = JSON.parse(JSON.stringify(oneItemDEMO))oneItem.text = data[index][keys.text]oneItem.value = data[index][keys.value]// 递归下去oneItem.children = this.handleTree(data, data[index][keys.id])res.push(oneItem)} } else {// 非顶级菜单 - 市、区、街道if (data[index].hasOwnProperty( keys.pid ) && data[index][keys.pid] == parent_code) {// 已匹配oneItem = JSON.parse(JSON.stringify(oneItemDEMO))oneItem.text = data[index][keys.text]oneItem.value = data[index][keys.value]// 递归下去oneItem.children = this.handleTree(data, data[index][keys.id])res.push(oneItem)}}}return res},

onLoad(options){this.localData = this.get_city_tree()
}

最后的效果：