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;

如有疑问请留言或者到本站社区交流讨论，本站关于微信小程序的文章还有很多，希望大家搜索查阅，感谢阅读，希望能帮助到大家谢谢大家对本站的支持！