Implementation of WeChat applet slide left to delete function

This article mainly introduces the relevant information about the implementation of the sliding left delete function of the WeChat applet. Friends in need can refer to the following

Implementation of the sliding left delete function of the WeChat applet

Implementation renderings:

Implementation code:

1, wxml touch-item The element is bound to bindtouchstart and bindtouchmove events

<view class="container">
 <view class="touch-item {{item.isTouchMove ? &#39;touch-move-active&#39; : &#39;&#39;}}" data-index="{{index}}" bindtouchstart="touchstart" bindtouchmove="touchmove" wx:for="{{items}}" wx:key="">
  <view class="content">{{item.content}}</view>
  <view class="del" catchtap="del" data-index="{{index}}">删除</view>
 </view>
</view>

2, wxss flex layout, css3 animation

.touch-item {
 font-size: 14px;
 display: flex;
 justify-content: space-between;
 border-bottom:1px solid #ccc;
 width: 100%;
 overflow: hidden
}
.content {
 width: 100%;
 padding: 10px;
 line-height: 22px;
 margin-right:0;
 -webkit-transition: all 0.4s;
 transition: all 0.4s;
 -webkit-transform: translateX(90px);
 transform: translateX(90px);
 margin-left: -90px
}
.del {
 background-color: orangered;
 width: 90px;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: center;
 color: #fff;
 -webkit-transform: translateX(90px);
 transform: translateX(90px);
 -webkit-transition: all 0.4s;
 transition: all 0.4s;
}
.touch-move-active .content,
.touch-move-active .del {
 -webkit-transform: translateX(0);
 transform: translateX(0);
}

3. The js comments are very detailed

var app = getApp()
Page({
 data: {
  items: [],
  startX: 0, //开始坐标
  startY: 0
 },
 onLoad: function () {
  for (var i = 0; i < 10; i++) {
   this.data.items.push({
    content: i + " 向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦",
    isTouchMove: false //默认全隐藏删除
   })
  }
  this.setData({
   items: this.data.items
  })
 },
 //手指触摸动作开始 记录起点X坐标
 touchstart: function (e) {
  //开始触摸时 重置所有删除
  this.data.items.forEach(function (v, i) {
   if (v.isTouchMove)//只操作为true的
    v.isTouchMove = false;
  })
  this.setData({
   startX: e.changedTouches[0].clientX,
   startY: e.changedTouches[0].clientY,
   items: this.data.items
  })
 },
 //滑动事件处理
 touchmove: function (e) {
  var that = this,
   index = e.currentTarget.dataset.index,//当前索引
   startX = that.data.startX,//开始X坐标
   startY = that.data.startY,//开始Y坐标
   touchMoveX = e.changedTouches[0].clientX,//滑动变化坐标
   touchMoveY = e.changedTouches[0].clientY,//滑动变化坐标
   //获取滑动角度
   angle = that.angle({ X: startX, Y: startY }, { X: touchMoveX, Y: touchMoveY });
  that.data.items.forEach(function (v, i) {
   v.isTouchMove = false
   //滑动超过30度角 return
   if (Math.abs(angle) > 30) return;
   if (i == index) {
    if (touchMoveX > startX) //右滑
     v.isTouchMove = false
    else //左滑
     v.isTouchMove = true
   }
  })
  //更新数据
  that.setData({
   items: that.data.items
  })
 },
 /**
  * 计算滑动角度
  * @param {Object} start 起点坐标
  * @param {Object} end 终点坐标
  */
 angle: function (start, end) {
  var _X = end.X - start.X,
   _Y = end.Y - start.Y
  //返回角度 /Math.atan()返回数字的反正切值
  return 360 * Math.atan(_Y / _X) / (2 * Math.PI);
 },
 //删除事件
 del: function (e) {
  this.data.items.splice(e.currentTarget.dataset.index, 1)
  this.setData({
   items: this.data.items
  })
 }
})

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