ztb-mini/components/city-change/index.js

import qqmap from '../../utils/map';  
import region2 from '../../utils/region2'
const app = getApp()
Component({
  properties: {
    styles: { //这个是可以自定义最外层的view的样式
      type: String,
      value: '',
      observer: function (newval, oldval) {
        // 监听改变
        console.log(newval, oldval);
      }
    },

  },
  data: {
    //下面是字母排序
    letter: ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"],
    cityListId: '',
    //下面是城市列表信息，这里只是模拟数据
    citylist:region2,
    //下面是热门城市数据，模拟数据
    newcity: [{"id":110100,"cityName":"北京"}, {"id":310100,"cityName":"上海"}, {"id":440100,"cityName":"广州"},{"id":440300,"cityName":"深圳"}],//若还需要添加则在region2中查找
    // citySel: '全国',
    locateCity: '',
    touchEndy:0,
    rightheight:0,
    topHeight:0,
    dialogIsShow:false,
    chooseCity:null,//缓存的城市
  },
  attached() {
    var that=this
    this.data.topHeight=app.globalData.CustomBar
    wx.getStorage({
      key: 'city',
      success: function(res){
        if(res.data.cityName){
          that.setData({
            chooseCity:res.data.cityName
          })
        }else{
          that.setData({
            chooseCity:''
          })
        }      
        },
        fail: function(res) {
          that.setData({
            chooseCity:''
          })
        }
      });
    var query = this.createSelectorQuery()
    query.select('#rightSortHeight').boundingClientRect(function (res) {
       console.log(res);
       that.setData({
        rightheight:res.height
       })
    }).exec();
  },
  methods: {
    //点击城市
    cityTap(e) {
      const val = e.currentTarget.dataset.val || '',
        types = e.currentTarget.dataset.types || '',
        Index = e.currentTarget.dataset.index || '',
        that = this;
      let city = this.data.citySel;
      let cityId=''
      switch (types) {
        case 'locate':
          //定位内容
          city = this.data.locateCity;
          break;
        case 'national':
          //全国
          city = '全国';
          break;
        case 'new':
          //热门城市
          city = val.cityName;
          cityId=val.id
          break;
        case 'list':
          //城市列表
          city = val.cityName;
          cityId=val.id
          break;
      }
      if (city) {
        var cityData={
          cityName: city,
          cityId:cityId
        }
        wx.setStorage({
          key: 'city',
          data: cityData
        }) //点击后给父组件可以通过bindcitytap事件，获取到cityname的值，这是子组件给父组件传值和触发事件的方法
        this.triggerEvent('citytap', {
          cityname: city,
          cityId:cityId
        });
      } else {
        console.log('还没有');
        this.getLocate();
      }

    },
    //点击城市字母
    letterTap(e) {
      const Item = e.currentTarget.dataset.item;
      this.setData({
        cityListId: Item
      });
      this.titleDialog(Item)
    
    },
    //调用定位
    getLocate(){
      let that=this;
      new qqmap().getLocateInfo().then(function (val) {//这个方法在另一个文件里，下面有贴出代码
        console.log(val);
        if (val.indexOf('市') !== -1) {//这里是去掉“市”这个字
          console.log(val.indexOf('市') - 1);
          val = val.slice(0, val.indexOf('市'));
          console.log(val);
        }
        that.setData({ 
          locateCity: val,
        });
        //把获取的定位和获取的时间放到本地存储
        wx.setStorageSync('locatecity', { city: val, time: new Date().getTime() });
      });
    },
    //开始触摸事件
    touchStart: function (e) {
      this.data.touchEndy = e.touches[0].pageY-this.data.topHeight;
    },
    touchMove: function (e) {
      this.data.touchEndy = e.touches[0].pageY-this.data.topHeight;
      var lindex = parseInt(this.data.touchEndy / this.data.rightheight * 26);//根据前面分析获取手指触摸位置在letters中的index值
      var value = this.data.letter[lindex];
      this.titleDialog(value)

    },
    touchEnd: function (e) {
      var lindex = parseInt(this.data.touchEndy / this.data.rightheight * 26);//根据前面分析获取手指触摸位置在letters中的index值
      var value = this.data.letter[lindex];
      if(value){
        this.setData({
          cityListId: value
        });
      }
     
      this.titleDialog(value)

    },
    titleDialog: function (value) {
      if(value){
        this.setData({
          dialongValue:value,
          dialogIsShow:true
        })
        setTimeout(() => {
          this.setData({
            dialongValue:null,
            dialogIsShow:false
          })
        }, 1500);
      }


    },
  },
  ready() {
    console.log(getApp());
    let that = this,
        cityOrTime = wx.getStorageSync('locatecity')||{},
        time = new Date().getTime(),
        city='';
    if (!cityOrTime.time||(time - cityOrTime.time > 1800000)){//每隔30分钟请求一次定位
      this.getLocate();
    }else{//如果未满30分钟，那么直接从本地缓存里取值
      that.setData({
        locateCity: cityOrTime.city
      })
    }
  },
})