微信小程序picker实现的省市区三级联动

微信小程序的省市区三级联动需要使用到的是Picker多列选择器，参考文档：https://www.w3cschool.cn/weixinapp/d9mw1q95.html

案例中用到的省市区的json文件在文后发出出来。

废话不多说，来看看具体地实现吧。

视图view
请选择

JS代码
var arrays = common.getAreaInfo();//在头部引入 省市区地址js,这里封装成了方法了。

data：
data: {

citysIndex: [0, 0, 0], //给一个初始值索引，因为有三列，所以3个0

},

onLoad：
onLoad: function(options) {
var that = this;
if (wx.getStorageSync(‘global_cityData’)) {
var cityArray = wx.getStorageSync(‘global_cityData’);
} else {
//定义三列空数组
var cityArray = [
[],
[],
[],
];
for (let i = 0, len = arrays.length; i < len; i++) {
switch (arrays[i][‘level’]) {
case 1:
//第一列
cityArray[0].push(arrays[i][“name”]);
break;
case 2:
//第二列(默认由第一列第一个关联)
if (arrays[i][‘sheng’] == arrays[0][‘sheng’]) {
cityArray[1].push(arrays[i][“name”]);
}
break;
case 3:
//第三列(默认第一列第一个、第二列第一个关联)
if (arrays[i][‘sheng’] == arrays[0][‘sheng’] && arrays[i][‘di’] == arrays[1][‘di’]) {
cityArray[2].push(arrays[i][“name”]);
}
break;
}
}
wx.setStorageSync(‘global_cityData’, cityArray);
}

that.setData({
  cityArray: cityArray
});

},

下面就是两个事件了

func_changeCitysChange: function(e) {
var that = this;
var cityArray = that.data.cityArray;

var address='';
if (that.data.ssq == undefined){
  //下面方法中没有设置ssq，应该给它默认值 ，此时citysIndex相当于[0,0,0]
  var citysIndex = that.data.citysIndex;
  for (let i in citysIndex) {
    address += cityArray[i][citysIndex[i]]
  }
}else{
  address = that.data.ssq;
}

wx.showModal({
  title: '',
  content: address+'',
})

},
func_changeCitysChangeColumn: function(e) {
var that = this;
var cityArray = that.data.cityArray;

var list1 = []; //存放第二列数据，即市的列
var list2 = []; //存放第三列数据，即区的列

var citysIndex = [];
//主要是注意地址文件中的字段关系，省、市、区关联的字段有 sheng、di、level
switch (e.detail.column) {
  case 0:
    //滑动左列
    for (let i = 0, len = arrays.length; i < len; i++) {          
      if (arrays[i]['name'] == cityArray[0][e.detail.value]) {
        var sheng = arrays[i]['sheng'];
      }
      if (arrays[i]['sheng'] == sheng && arrays[i]['level'] == 2) {
        list1.push(arrays[i]['name']);
      }
      if (arrays[i]['sheng'] == sheng && arrays[i]['level'] == 3 && arrays[i]['di'] == arrays[1]['di']) {
        list2.push(arrays[i]['name']);
      }
    }       


    citysIndex = [e.detail.value, 0, 0];
    var ssq = cityArray[0][e.detail.value] + list1[0] + list2[0]+'';          

    that.setData({
      global_sheng: sheng
    });  
    break;
  case 1:
    //滑动中列
    var  di;
    var sheng = that.data.global_sheng;
    list1 = cityArray[1];
    for (let i = 0, len = arrays.length; i < len; i++) {     
      if (arrays[i]['name'] == cityArray[1][e.detail.value]) {
        di = arrays[i]['di'];
      }         
    } 
    for (let i = 0, len = arrays.length; i < len; i++) {
      if (arrays[i]['sheng'] == sheng && arrays[i]['level'] == 3 && arrays[i]['di'] == di) {
        list2.push(arrays[i]['name']);
      }
    }
    citysIndex = [that.data.citysIndex[0], e.detail.value, 0];

    var ssq = cityArray[0][that.data.citysIndex[0]] + list1[e.detail.value] + list2[0] + '';

    break;
  case 2:
    //滑动右列
    list1 = cityArray[1];
    list2 = cityArray[2];
    citysIndex = [that.data.citysIndex[0], that.data.citysIndex[1], e.detail.value];

    var ssq = cityArray[0][that.data.citysIndex[0]] + list1[that.data.citysIndex[1]] + list2[e.detail.value] + '';
    break;
}

that.setData({
  "cityArray[1]": list1,//重新赋值中列数组，即联动了市
  "cityArray[2]": list2,//重新赋值右列数组，即联动了区
  citysIndex: citysIndex,//更新索引
  ssq: ssq,//获取选中的省市区
});

},
用到的省市区js文件，点下面链接。
省市区js文件,点击查看，提取码: xy6v