小程序 picker 多列选择器 数据动态获取

<picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange" value="{{multiIndex}}" range="{{multiArray}}">
　　<view class="picker">
      当前选择：{{multiArray[0][multiIndex[0]]}} > {{multiArray[1][multiIndex[1]]}}
    </view>
</picker>

    "result": [
        {
            "teach_area_id": "xxx1",　　//值为模拟 加密数据
            "teach_area_name": "上海校区"
        },
        {
            "teach_area_id": "xxx2",
            "teach_area_name": "无锡校区"
        },
        {
            "teach_area_id": "xxx3",
            "teach_area_name": "苏州校区"
        },
        {
            "teach_area_id": "xxx4",
            "teach_area_name": "杭州校区"
        },
        {
            "teach_area_id": "xxx5",
            "teach_area_name": "南京校区"
        },
        {
            "teach_area_id": "xxx6",
            "teach_area_name": "北京校区"
        },
        {
            "teach_area_id": "xxx7",
            "teach_area_name": "广州校区"
        },
        {
            "teach_area_id": "xxx",
            "teach_area_name": "深圳校区"
        }
    ],

wx.request({
    url:‘https://api.xxxxxxx‘,
    data: {},
    header: {
      ‘content-type‘: ‘application/json‘ // 默认值
    },
    success(){
      var xiaoquList = res.data.result;
      var xiaoquArr = xiaoquList.map(item => {　　　　// 此方法将校区名称区分到一个新数组中
        return item.teach_area_name;
      });
      that.setData({
        multiArray: [xiaoquArr, []],　　　　
        xiaoquList,
        xiaoquArr
      })
      var default_xiaoqu_id = xiaoquList[0][‘teach_area_id‘];　　　　//获取默认的校区对应的 teach_area_id
      if (default_xiaoqu_id) {
        that.searchClassInfo(default_xiaoqu_id)　　　　　　// 如果存在调用获取对应的班级数据
      }
    }
  })   

"result": [
        {　　
            "teach_instance_id": "xxx",　　　　//加密数值
            "teach_instance_name": "2级-33期-1班"
        },
        {
            "teach_instance_id": "xxx1",
            "teach_instance_name": "3级-25期-10班"
        },
        {
            "teach_instance_id": "xxx2",
            "teach_instance_name": "3级-25期-9班"
        },
  ]

searchClassInfo(xiaoqu_id){
    var that = this;
    if (xiaoqu_id) {
      this.setData({
        teach_area_id: xiaoqu_id
      })
      var url = ‘https://classapi‘;
      util.http(url, { teach_area_id: xiaoqu_id},res => {　　　　　　// 此处将请求封装在util.js中
        var classList = res.data.result;
        var classArr = classList.map(item => {
          return item.teach_instance_name;
        })
        classArr.unshift(‘全部班级‘);　　　　　　// 接口中没有提供全部班级字段，添加之
        var xiaoquArr = this.data.xiaoquArr;
        that.setData({
          multiArray: [xiaoquArr, classArr],
          classArr,
          classList
        })
      })
      
    }
  },

bindMultiPickerColumnChange: function (e) {
    //e.detail.column 改变的数组下标列, e.detail.value 改变对应列的值
    console.log(‘修改的列为‘, e.detail.column, ‘，值为‘, e.detail.value);
    var data = {
      multiArray: this.data.multiArray,
      multiIndex: this.data.multiIndex
    };
    data.multiIndex[e.detail.column] = e.detail.value;
    var teach_area_id_session = this.data.teach_area_id;　　　　// 保持之前的校区id 与新选择的id 做对比，如果改变则重新请求数据
    switch (e.detail.column) {
      case 0:
        var xiaoquList = this.data.xiaoquList;
        var teach_area_id = xiaoquList[e.detail.value][‘teach_area_id‘];
        if (teach_area_id_session != teach_area_id) {　　　　// 与之前保持的校区id做对比，如果不一致则重新请求并赋新值
          this.searchClassInfo(teach_area_id);　　　　　　
        }
        data.multiIndex[1] = 0;
        break;
    }
    this.setData(data);
  },

bindMultiPickerChange: function (e) {
    console.log(‘picker发送选择改变，携带值为‘, e.detail.value)
    var class_key = 0;
    var classList =this.data.classList;
    var select_key = e.detail.value[1];
    var real_key = select_key - 1;
    if (real_key < class_key) {
      this.setData({
        class_id: 0
      })
    } else {
      this.setData({
        class_id: classList[real_key][‘teach_instance_id‘]　　　　　　// class_id 代表着选择的班级对应的 班级id
      })
    }
    this.setData({
      multiIndex: e.detail.value
    })
  },