微信小程序三级联动地址选择器的实例代码

module.exports = {
 citys,
 provinces,
 areas
}

<view class="picker-view" animation="{{animationAddressMenu}}" style="visibility:{{addressMenuIsShow ? 'visible':'hidden'}}">
 <view style="height:10% ;width:95%;margin-top:10rpx">
  <text catchtap="cityCancel">取消</text>
  <text style="float: right" catchtap="citySure">确定</text>
 </view>
 <picker-view style="width: 100%; height: 300px;" bindchange="cityChange" value="{{value}}" wx:key="">
  <picker-view-column>
   <view wx:for="{{provinces}}" class="picker-item">
    {{item.name}}</view>
  </picker-view-column>
  <picker-view-column>
   <view wx:for="{{citys}}" class="picker-item" wx:key="">
    {{item.name}}</view>
  </picker-view-column>
  <picker-view-column>
   <view wx:for="{{areas}}" class="picker-item" wx:key="">
    {{item.name}}</view>
  </picker-view-column>
 </picker-view>
</view>

.picker-view {
 width: 100%;
 display: flex;
 z-index:12;
 background-color: #fff;
 flex-direction: column;
 justify-content: center;
 align-items: center;
 position: fixed;
 bottom: 0rpx;
 left: 0rpx;
 height: 40vh;
}

.picker-item {
 line-height: 70rpx;
 margin-left: 5rpx;
 margin-right: 5rpx;
 text-align: center;
}

/**
  * 控件当前显示的数据
  * provinces:所有省份
  * citys 选择省对应的所有市,
  * areas选择市对应的所有区
  * areaInfo：点击确定时选择的省市县字符拼接
  * animationAddressMenu：动画
  * addressMenuIsShow：是否可见
  */
 data: {
  animationAddressMenu: {},
  addressMenuIsShow: false,
  value: [0, 0, 0],
  provinces: [],
  citys: [],
  areas: [],
  areaInfo:''
 },

var address = require('../../utils/city.js')

// 默认联动显示北京
  var id = address.provinces[0].id
  this.setData({
   provinces: address.provinces,
   citys: address.citys[id],
   areas: address.areas[address.citys[id][0].id],
  })

// 点击所在地区弹出选择框
 selectDistrict: function (e) {
  var that = this
  // 如果已经显示，不在执行显示动画
  if (that.data.addressMenuIsShow) {
   return
  }
  // 执行显示动画
  that.startAddressAnimation(true)
 },
 // 执行动画
 startAddressAnimation: function (isShow) {
  console.log(isShow)
  var that = this
  if (isShow) {
   // vh是用来表示尺寸的单位，高度全屏是100vh
   that.animation.translateY(0 + 'vh').step()
  } else {
   that.animation.translateY(40 + 'vh').step()
  }
  that.setData({
   animationAddressMenu: that.animation.export(),
   addressMenuIsShow: isShow,
  })
 },
 // 点击地区选择取消按钮
 cityCancel: function (e) {
  this.startAddressAnimation(false)
 },
 // 点击地区选择确定按钮
 citySure: function (e) {
  var that = this
  var city = that.data.city
  var value = that.data.value
  that.startAddressAnimation(false)
  // 将选择的城市信息显示到输入框
  var areaInfo = that.data.provinces[value[0]].name + ',' + that.data.citys[value[1]].name + ',' + that.data.areas[value[2]].name
  that.setData({
   areaInfo: areaInfo,
  })
 },
 // 点击蒙版时取消组件的显示
 hideCitySelected: function (e) {
  console.log(e)
  this.startAddressAnimation(false)
 },
 // 处理省市县联动逻辑
 cityChange: function (e) {
  console.log(e)
  var value = e.detail.value
  var provinces = this.data.provinces
  var citys = this.data.citys
  var areas = this.data.areas
  var provinceNum = value[0]
  var cityNum = value[1]
  var countyNum = value[2]
  // 如果省份选择项和之前不一样，表示滑动了省份，此时市默认是省的第一组数据，
  if (this.data.value[0] != provinceNum) {
   var id = provinces[provinceNum].id
   this.setData({
    value: [provinceNum, 0, 0],
    citys: address.citys[id],
    areas: address.areas[address.citys[id][0].id],
   })
  } else if (this.data.value[1] != cityNum) {
   // 滑动选择了第二项数据，即市，此时区显示省市对应的第一组数据
   var id = citys[cityNum].id
   this.setData({
    value: [provinceNum, cityNum, 0],
    areas: address.areas[citys[cityNum].id],
   })
  } else {
   // 滑动选择了区
   this.setData({
    value: [provinceNum, cityNum, countyNum]
   })
  }
  console.log(this.data)
 },