微信小程式開發之城市選擇器 城市切換
阿新 • • 發佈:2018-12-31
移動開發中城市選擇器必不可少.
空白造了個.
gif:
這裡只上部分js程式碼:
var city = require('../../utils/city.js');
//歡迎關注:http://www.wxapp-union.com/portal.php
//CSDN微信小程式開發專欄:http://blog.csdn.net/column/details/13721.html
Page({
data: {
searchLetter: [],
showLetter: "",
winHeight: 0,
tHeight: 0,
bHeight: 0,
startPageY: 0 ,
cityList: [],
isShowLetter: false,
scrollTop: 0,
city: ""
},
onLoad: function (options) {
// 生命週期函式--監聽頁面載入
var searchLetter = city.searchLetter;
var cityList = city.cityList();
// console.log(cityInfo);
var sysInfo = wx.getSystemInfoSync();
console.log(sysInfo);
var winHeight = sysInfo.windowHeight;
//新增要匹配的字母範圍值
//1、更加螢幕高度設定子元素的高度
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 () {
// 生命週期函式--監聽頁面初次渲染完成
},
onShow: function () {
// 生命週期函式--監聽頁面顯示
},
onHide: function () {
// 生命週期函式--監聽頁面隱藏
},
onUnload: function () {
// 生命週期函式--監聽頁面解除安裝
},
onPullDownRefresh: function () {
// 頁面相關事件處理函式--監聽使用者下拉動作
},
onReachBottom: function () {
// 頁面上拉觸底事件的處理函式
},
onShareAppMessage: function () {
// 使用者點選右上角分享
return {
title: 'title', // 分享標題
desc: 'desc', // 分享描述
path: 'path' // 分享路徑
}
},
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) { //向上移動
if (pageY < tHeight) {
// showLetter=this.mateLetter(pageY,this);
this.nowLetter(pageY, this);
}
} else {//向下移動
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) {//當前選中的資訊
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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