微信小程序开发中怎么实现城市选择器

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移动开发中城市选择器必不可少.

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这里只上部分js代码:

var city = require('../../utils/city.js');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 < searchLetter.length; i++) {   var temp = {};   temp.name = searchLetter[i];   temp.tHeight = i * itemH;   temp.bHeight = (i + 1) * itemH;   tempObj.push(temp)  }  this.setData({   winHeight: winHeight,   itemH: itemH,   searchLetter: tempObj,   cityList: cityList  })  console.log(this.data.cityInfo); }, onReady: function () {  // 生命周期函数--监听页面初次渲染完成 }, onShow: function () {  // 生命周期函数--监听页面显示 }, onHide: function () {  // 生命周期函数--监听页面隐藏 }, onUnload: function () {  // 生命周期函数--监听页面卸载 }, onPullDownRefresh: function () {  // 页面相关事件处理函数--监听用户下拉动作 }, onReachBottom: function () {  // 页面上拉触底事件的处理函数 }, onShareAppMessage: function () {  // 用户点击右上角分享  return {   title: 'title', // 分享标题   desc: 'desc', // 分享描述   path: 'path' // 分享路径  } }, searchStart: function (e) {  var showLetter = e.currentTarget.dataset.letter;  var pageY = e.touches[0].pageY;  this.setScrollTop(this, showLetter);  this.nowLetter(pageY, this);  this.setData({   showLetter: showLetter,   startPageY: pageY,   isShowLetter: true,  }) }, searchMove: function (e) {  var pageY = e.touches[0].pageY;  var startPageY = this.data.startPageY;  var tHeight = this.data.tHeight;  var bHeight = this.data.bHeight;  var showLetter = 0;  console.log(pageY);  if (startPageY - pageY > 0) { //向上移动   if (pageY < tHeight) {    // showLetter=this.mateLetter(pageY,this);    this.nowLetter(pageY, this);   }  } else {//向下移动   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 < letterData.length; i++) {   if (letterData[i].tHeight <= pageY && pageY <= letterData[i].bHeight) {    bHeight = letterData[i].bHeight;    tHeight = letterData[i].tHeight;    showLetter = letterData[i].name;    break;   }  }  this.setScrollTop(that, showLetter);  that.setData({   bHeight: bHeight,   tHeight: tHeight,   showLetter: showLetter,   startPageY: pageY  }) }, bindScroll: function (e) {  console.log(e.detail) }, setScrollTop: function (that, showLetter) {  var scrollTop = 0;  var cityList = that.data.cityList;  var cityCount = 0;  var initialCount = 0;  for (var i = 0; i < cityList.length; i++) {   if (showLetter == cityList[i].initial) {    scrollTop = initialCount * 30 + cityCount * 41;    break;   } else {    initialCount++;    cityCount += cityList[i].cityInfo.length;   }  }  that.setData({   scrollTop: scrollTop  }) }, bindCity: function (e) {  var city = e.currentTarget.dataset.city;  this.setData({ city: city }) }})

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