小程序组件开发中的有关省市区三级联动的相关介绍

效果图：

源码

• index.wxml

<import src="../../templates/address-temp"/>  <template is="addressPicker"     data="{{provinceIndex:city.provinceIndex,cityIndex:city.cityIndex,districtIndex:city.districtIndex,province:city.province,     city:city.city[city.selectedProvince],district:city.district[city.selectedCity]}}"/>

• index.js

  var city = require("../../utils/city.js");  Page({      data: {},      onLoad: function() {          console.log('onLoad...');          var that = this;          city.init(that);      }  });

• address-temp.wxml

<?xml version="1.0" encoding="utf-8"?>    <template name="addressPicker">     <view style="display:flex;margin:0;height:100%;align-items: center;justify-content: center">       <view style="width:100%;">         <picker bindchange="bindProvinceChange" value="{{provinceIndex}}" range="{{province}}">           <view style="text-align:center;padding:10rpx;font-size:0.8rem">{{province[provinceIndex]}}</view>         </picker>       </view>        <view style="width:100%;">         <picker bindchange="bindCityChange" value="{{cityIndex}}" range="{{city}}">           <view style="text-align:center;padding:10rpx;font-size:0.8rem">{{city[cityIndex]}}</view>         </picker>       </view>        <view style="width:100%;">         <picker bindchange="bindDistrictChange" value="{{districtIndex}}" range="{{district}}">           <view style="text-align:center;padding:10rpx;font-size:0.8rem">{{district[districtIndex]}}</view>         </picker>       </view>     </view>  </template>

• city.js

var city = {      province: ['-请选择-', '福建省'],      city: {          '-请选择-': ['-请选择-'],          '福建省': ['福州市', '厦门市', '泉州市']      },      district: {          '-请选择-': ['-请选择-'],          '福州市': ['鼓楼区', '台江区'],          '厦门市': ['湖里区', '集美区'],          '泉州市': ['晋江市', '安溪县']      },      provinceIndex: 0,      cityIndex: 0,      districtIndex: 0,      selectedProvince: '-请选择-',      selectedCity: '-请选择-',      selectedDistrct: '-请选择-'  };  function init(that) {      that.setData({          'city': city      });      var bindProvinceChange = function(e) {          var city = that.data.city;          that.setData({              'city.provinceIndex': e.detail.value,              'city.selectedProvince': city.province[e.detail.value],              'city.selectedCity': city.city[city.province[e.detail.value]][0],              'city.selectedDistrct': city.district[city.city[city.province[e.detail.value]][0]][0],              'city.cityIndex': 0,              'city.districtIndex': 0          });      };      var bindCityChange = function(e) {          var city = that.data.city;          that.setData({              'city.cityIndex': e.detail.value,              'city.selectedCity': city.city[city.selectedProvince][e.detail.value],              'city.districtIndex': 0,              'city.selectedDistrct': city.district[city.city[city.selectedProvince][e.detail.value]][0]          });      };      var bindDistrictChange = function(e) {          var city = that.data.city;          that.setData({              'city.districtIndex': e.detail.value,              'city.selectedDistrct': city.district[city.selectedCity][e.detail.value]          });      };      that['bindProvinceChange'] = bindProvinceChange;      that['bindCityChange'] = bindCityChange;      that['bindDistrictChange'] = bindDistrictChange;  }  module.exports = {      init: init  }

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