详解微信小程序开发之城市选择器城市切换

空白造了个.

gif:

这里只上部分js代码:

var city = require(&＃39;../../utils/city.js&＃39;);

Page({
 data: {
  searchLetter: [],
  showLetter: "",
  winHeight: 0,
  tHeight: 0,
  bHeight: 0,
  startPageY: 0,
  cityList: [],
  isShowLetter: false,
  scrollTop: 0,
  city: ""
 },
 onLoad: function (options) {
  // 生命周期函数--监听页面加载
  var searchLetter = city.searchLetter;
  var cityList = city.cityList();
  // console.log(cityInfo);

  var sysInfo = wx.getSystemInfoSync();
  console.log(sysInfo);
  var winHeight = sysInfo.windowHeight;

  //添加要匹配的字母范围值
  //1、更加屏幕高度设置子元素的高度
  var itemH = winHeight / searchLetter.length;
  var tempObj = [];
  for (var i = 0; i  0) { //向上移动
   if (pageY  bHeight) {
    // showLetter=this.mateLetter(pageY,this);
    this.nowLetter(pageY, this);
   }
  }
 },
 searchEnd: function (e) {
  // console.log(e);
  // var showLetter=e.currentTarget.dataset.letter;
  var that = this;
  setTimeout(function () {
   that.setData({
    isShowLetter: false
   })
  }, 1000)

 },
 nowLetter: function (pageY, that) {//当前选中的信息
  var letterData = this.data.searchLetter;
  var bHeight = 0;
  var tHeight = 0;
  var showLetter = "";
  for (var i = 0; i 
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