如何实现微信好友列表点击字母跳转对应位置

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。

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}}

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);    }   }  })

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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