How to realize that clicking on a letter in the WeChat friend list jumps to the corresponding position

Is there a function on WeChat, which is to jump to the corresponding position by clicking on the letter in the list? This article mainly introduces the relevant information on the WeChat applet development of the friend list letter list to jump to the corresponding position. I hope this article can help everyone. Everyone has implemented such a function. Friends who need it can refer to it. I hope it can help everyone.

WeChat applet development friend list letter list jump corresponding position

Foreword:

In the small The program implements the effect of clicking on the letter list on the right side of the WeChat friend list to jump to the corresponding position. I wrote a demo. The core part is very simple, so there are not many comments. If you encounter any problems, please join the group and ask me.

Core technical points:

1. The scroll-into-view and scroll-with-animation. scroll-y attributes of the scroll-view component of the mini program.
2. Application of touch event of mini program.
3. Application of Js timer.

view page code:

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 code:

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 = &#39;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&#39;;
   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: &#39;A&#39;,
    curView: &#39;☆&#39;
   })
  }
  if (!this.timer) {
   this.timer = setTimeout(function () {
    that.setData({
     hide: true
    });
    that.timer = null;
   }, 1000);
  }
 }
})

Style part

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;

Related recommendations:

How to implement the WeChat applet scroll view container

How to set the URL and token of the WeChat applet

How to obtain user information interface for the Thinkphp5 WeChat applet

The above is the detailed content of How to realize that clicking on a letter in the WeChat friend list jumps to the corresponding position. For more information, please follow other related articles on the PHP Chinese website!