微信小程序 自定义二维picker组件（省市）

html:

   
              
                 {{ provinceName }}——{{ cityName }}
              
     

 

js

初始化：

// 二位数组

multiArray: [[], []],

multiIndex: [0, 0],

// 后台数据

"areaList": [ 
{ "code": "001", "level": 1, "name": "广东省", "list": [ { "code": "001001", "level": 2, "name": "广州市",} ] }, 
{ "code": "110", "level": 1, "name": "北京市", "list": [ { "code": "110100", "level": 2, "name": "北京市"} ] }
 ]

 

// 转换格式

const formatAreaList = (areaList) => {

let provinceArr = [];

let cityArrObj = {};

areaList.forEach((item, index) => {

if (item.level === 1) {

provinceArr.push(item.name);

let cityArr = item.list.map(i => {

return i.name

})

cityArrObj[item.name] = cityArr

}

})

console.log(provinceArr,cityArrObj)

return {

provinceArr,

cityArrObj

}

}

事件实现：

/**

* 生命周期函数--监听页面加载

*/

onLoad: function (options) {

      let {
          provinceArr,
          cityArrObj
        } = formatAreaList(areaList)

      that.setData({
          areaList,
          provinceArr,
          cityArrObj
        })


      // 调整二级联动数据结构
      that.adjustAreaList()

},

// 调整二级联动数据结构
  adjustAreaList() {
    let that = this
    let {
      areaList,
      multiArray,
      provinceName,
      multiIndex,
      cityName,
      provinceArr,
      cityArrObj
    } = that.data


    if (provinceName && cityName) {

      // 存在则自动定位到相应的省市

      this.setData({
        multiArray: [provinceArr, cityArrObj[provinceName]],
        multiIndex: [provinceArr.indexOf(provinceName), cityArrObj[provinceName].indexOf(cityName)]
      })


    } else {

      // 默认第一个

      that.setData({
        multiArray: [provinceArr, cityArrObj[provinceArr[0]]],
        multiIndex: [0, 0]
      })
      console.log('默认第一个', multiArray, multiIndex)

    }
  },

// 确定选择器的选择

bindMultiPickerChange: function (e) {

       let that = this

       console.log('picker发送选择改变，携带值为', e.detail.value)

       that.setData({

            multiIndex: e.detail.value

         })

    },

// 选择器滚动中

  bindMultiPickerColumnChange(e) {
    let that = this
    let {
      areaList,
      multiArray,
      multiIndex
    } = that.data

    let col = e.detail.column
    let val = e.detail.value
    multiIndex[col] = val

    switch (col) {
      case 0:

        for (let i = 0; i < areaList.length; i++) {

          switch (multiIndex[0]) {

            case i:
              let addressArray = []
              for (let j = 0; j < areaList[i].list.length; j++) {
                addressArray.push(areaList[i].list[j].name)
              }

              multiArray[1] = addressArray
              break
          }
        }

        multiIndex[0] = val
        multiIndex[1] = 0
        that.setData({
          multiIndex,
          multiArray
        })
    }
  },

 

// 取消选择

  cancelPicker() {
    console.log('取消选择器');
    let {
      provinceArr,
      cityArrObj,
      provinceName,
      cityName
    } = this.data
    this.setData({
      multiArray: [provinceArr, cityArrObj[provinceName]],
      multiIndex: [provinceArr.indexOf(provinceName), cityArrObj[provinceName].indexOf(cityName)]
    })

  },