微信小程序开发之好友列表字母列表跳转对应位置

微信小程序开发之好友列表字母列表跳转对应位置

前言：

在小程序里实现微信好友列表点击右侧字母列表跳转对应位置效果。写了个demo，核心部分很简单，所以没多少注释，如果遇到问题就加群问我吧。

核心技术点：

1、小程序scroll-view组件的scroll-into-view， scroll-with-animation. scroll-y属性。 2、小程序的touch事件的应用。 3、Js定时器的应用。

view页面代码：

index.wxml

 class="container" scroll-y>
 class="info" id="info" scroll-with-animation scroll-y scroll-top="200" scroll-into-view="{{toView}}" style="height:{{height}}px;">
 class="iitem" id="{{item.id}}" wx:for="{{info_list}}" wx:key="1">
 {{item.id}} . {{item.desc}}
 
 
 class="letter {{active == true ? 'active': ''}}" bindtouchstart='start' bindtouchmove='move' bindtouchend='end'>
 class="litem" bindtap='down' data-index="999">☆
 class="litem" wx:for="{{letter_list}}" bindtap='down' wx:for-index="index" wx:key="2" data-index="{{index}}" style="height: {{letter_height}}px;">{{item}}
 
 class="tips" hidden="{{hide}}">{{curView}}

js代码：

index.js

//index.js
//获取应用实例
const app = getApp()
Page({
 data: {
 letter_list: [],
 info_list: [],
 hide: true,
 active: false,
 toView: 'A',
 curView: 'A',
 letter_height: 18
 },
 onLoad: function () {
 this.active = false;
 this.timer = null;
 var letter_list = ['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'];
 var info_list = [];
 for (var i = 0; i < 26; i++) {
 var obj = {};
 obj.id = letter_list;
 obj.desc = '这是一个用于测试的DEMO。1.目标是用于实现微信好友列表的点击首字母跳转到对应好友位置。2.目标是用于实现微信好友列表的点击首字母跳转到对应好友位置';
 info_list.push(obj);
 }
 this.setData({
 height: app.globalData.height,
 info_list: info_list,
 letter_list: letter_list,
 sHeight: 100 * 26 + 25
 });
 },
 start: function (e) {
 this.setData({
 active: true,
 hide: false
 })
 },
 end: function (e) {
 if (this.timer) {
 clearTimeout(this.timer);
 this.timer = null;
 }
 var moveY = e.changedTouches["0"].clientY - 18, that = this;
 var curIndex = parseInt(moveY / 18);
 var view = this.data.letter_list[curIndex];
 this.setData({
 toView: view,
 active: false
 });
 if (!this.timer) {
 this.timer = setTimeout(function () {
 that.setData({
 hide: true
 })
 that.timer = null;
 }, 1000);
 }
 },
 move: function (e) {
 var moveY = e.changedTouches["0"].clientY - 18;
 var curIndex = parseInt(moveY / 18);
 var view = this.data.letter_list[curIndex];
 this.setData({
 curView: view
 })
 },
 down: function (e) {
 if (this.timer) {
 clearTimeout(this.timer);
 this.timer = null;
 }
 var index = e.currentTarget.dataset.index,
 that = this;
 if (index != 999) {
 var view = this.data.letter_list[index];
 this.setData({
 toView: view,
 curView: view
 })
 } else {
 this.setData({
 toView: 'A',
 curView: '☆'
 })
 }
 if (!this.timer) {
 this.timer = setTimeout(function () {
 that.setData({
 hide: true
 });
 that.timer = null;
 }, 1000);
 }
 }
})

样式部分

index.wxss

/**index.wxss**/
text {
 font-weight: bold
}
.letter {
 font-size: 12px;
 width: 24px;
 height: 100%;
 position: fixed;
 right: 0;
 top: 0;
 z-index: +999;
}
.litem {
 width: 24px;
 height: 18px;
 line-height: 18px;
 text-align: center;
}
.info {
 font-size: 12px;
 text-align: justify;
 overflow: hidden;
}
.active {
 background: rgba(0, 0, 0, 0.2);
}
.iitem {
 padding: 10rpx 10rpx;
 margin-bottom: 10rpx;
 border-radius: 8rpx;
 background: rgba(222,222,222,0.2);
 box-sizing: border-box;
}
.tips {
 width: 40px;
 height: 40px;
 background: rgba(0,0,0,0.4);
 font-size: 20px;
 text-align: center;
 line-height: 40px;
 color: #fff;
 position: fixed;
 left: 50%;
 top: 50%;
 margin: -20px;
 z-index: +999;
 border-radius: 10rpx;

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