微信小程序如何实现地区选择伪五级联动

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效果图

这里采用的是自定义多列选择器picker mode="multiSelector"

<view class="section">
    <view class="section__title">多列选择器</view>
    <picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange" value="{{multiIndex}}" range="{{multiArray}}">
      <view wx:if="{{multiIndex[0]==0}}" class="picker" style='font-size:24rpx'>
        当前选择：全国
      </view>
      <view wx:elif="{{multiIndex[1]==0}}" class="picker" style='font-size:24rpx'>
        当前选择：{{multiArray[0][multiIndex[0]]}}
      </view>
      <view wx:elif="{{multiIndex[2]==0}}" class="picker" style='font-size:24rpx'>
        当前选择：{{multiArray[0][multiIndex[0]]}}-{{multiArray[1][multiIndex[1]]}}
      </view>
      <view wx:elif="{{multiIndex[3]==0}}" class="picker" style='font-size:24rpx'>
        当前选择：{{multiArray[0][multiIndex[0]]}}-{{multiArray[1][multiIndex[1]]}}-{{multiArray[2][multiIndex[2]]}}
      </view>
      <view wx:else class="picker" style='font-size:24rpx'>
        当前选择：{{multiArray[0][multiIndex[0]]}}-{{multiArray[1][multiIndex[1]]}}-{{multiArray[2][multiIndex[2]]}}-{{multiArray[3][multiIndex[3]]}}
      </view>
    </picker>
</view>

multiArray包含4个数组（省市县镇），multiIndex是4个数组对应选中下标 

onLoad: async function (options) {
    let chinaData = await getCountryList()
    chinaData.unshift({city: [],code: 0,name: "全部"})
    for(let one of chinaData){
        one.city.unshift({county: [],code: 0,name: "全部"})
        for(let two of one.city){
            two.county.unshift({code: 0,name: "全部"})
        }
    }
    this.data.chinaData = chinaData;
    let sheng = []; //  设置省数组
    for(let i = 0; i < chinaData.length; i++) {
       sheng.push(chinaData[i].name);
    }
    this.setData({
       "multiArray[0]": sheng
    })
    this.getCity(); // 得到市
},
    bindMultiPickerChange: function(e) {
        console.log(e);
    },
    bindMultiPickerColumnChange: function(e) {
        let move = e.detail;
        let index = move.column;
        let value = move.value;
        if (index == 0) {
          this.setData({
            multiIndex: [value,0,0,0]
          })
          this.getCity();
        }
        if (index == 1) {
          this.setData({
            "multiIndex[1]": value,
            "multiIndex[2]": 0,
            "multiIndex[3]": 0
          })
          this.getXian();
        }
        if (index == 2) {
          this.setData({
            "multiIndex[2]": value,
            "multiIndex[3]": 0,
     
          })
          this.getZhen();
        }
        if (index == 3) {
          this.setData({
            "multiIndex[3]": value
          })
          this.getZhen();
        }
    },
    getCity: function() { //  得到市
        let shengNum = this.data.multiIndex[0];
        let chinaData = this.data.chinaData;
        let cityData = chinaData[shengNum].city;
        let city = [];
        for (let i = 0; i < cityData.length; i++) {
          city.push(cityData[i].name)
        }
        this.setData({
          "multiArray[1]": city
        })
        this.getXian();
    },
    getXian: function(e) { //  得到县
        let shengNum = this.data.multiIndex[0];
        let cityNum = this.data.multiIndex[1];
        let chinaData = this.data.chinaData;
        let xianData = chinaData[shengNum].city[cityNum].county;
        let xian = [];
        for (let i = 0; i < xianData.length; i++) {
          xian.push(xianData[i].name)
        }
        this.setData({
          "multiArray[2]": xian
        })
        this.getZhen();
    },
    async getZhen(){//  得到镇
        let shengNum = this.data.multiIndex[0];
        let cityNum = this.data.multiIndex[1];
        let xianNum = this.data.multiIndex[2];
        let chinaData = this.data.chinaData;
        let zhen = [];
        if(chinaData[shengNum].city[cityNum].county[xianNum].code == 0){
            this.setData({
                "multiArray[3]" : ["全部"]
            })
        }else{
            //这里需要传县的code值获取镇的数据
            let res =  await getTownByCounty(chinaData[shengNum].city[cityNum].county[xianNum].code)
            let zhenData = JSON.parse(res.data.data.json)
            zhenData.unshift({code: 0,name: "全部"})
            for (let i = 0; i < zhenData.length; i++) {
                zhen.push(zhenData[i].name)
            }
            this.setData({
                "multiArray[3]" : zhen
            })
        }
    }

省市县数据返回类型

镇返回数据

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