本文小编为大家详细介绍“微信小程序开发中怎么实现城市选择器”，内容详细，步骤清晰，细节处理妥当，希望这篇“微信小程序开发中怎么实现城市选择器”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。
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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 })
}
})读到这里，这篇“微信小程序开发中怎么实现城市选择器”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注创新互联行业资讯频道。
