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js implements finger sliding carousel effect on mobile terminal

小云云Original: 2018-01-03 09:24:113091browse

This article mainly shares with you an example of js native implementation of the finger sliding carousel effect on the mobile terminal. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor to take a look, I hope it can help everyone.

As shown below:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <title>Document</title>
</head>
<style>
  html{height:100%;}
  body{width: 100%;height:100%;margin:0;overflow: hidden;}
  .wrap{position: relative;overflow: hidden;}
  .box{position: absolute;list-style: none;left:0;top:0;padding:0;margin:0;}
  .box li{float:left;}
  .box{
    position: relative;
    height: 2000px;
    width: 100%;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: red;
  }
  .box1{
    height: 2000px;
  }
  .box2{
    background: yellow;
  }
  .box3{
    background: yellowgreen;
  }
  .box4{
    background: orange;
  }
  .box5{
    background: cyan;
  }
</style>
<body>
<p class="wrap">
  <ul class="box">
    <li><p class="box1 box2">11111</p></li>
    <li><p class="box1 box3">2222</p></li>
    <li><p class="box1 box4">3333</p></li>
    <li><p class="box1 box5">4444</p></li>
  </ul>
</p>
<script>
  var aLi = document.querySelectorAll(".box li");
  var box = document.querySelector('.box');
  var wrap = document.querySelector('.wrap');
  var aLiWidth = box.offsetWidth;
  console.log('aLiWidth: ' + aLiWidth)
  wrap.style.height = aLi[0].offsetHeight + 'px';
  // 设置盒子的宽度
  box.style.width = aLi.length*100 + '%';
  for(var i=0;i<aLi.length;i++){
    aLi[i].style.width = 1/aLi.length * 100 + &#39;%&#39;;
  };
  // 初始化手指坐标点
  var startPoint = 0;
  var startEle = 0;
  //手指按下
  wrap.addEventListener("touchstart",function(e){
    startPoint = e.changedTouches[0].pageX;
    startEle = box.offsetLeft;
  });
  //手指滑动
  wrap.addEventListener("touchmove",function(e){
    var currPoint = e.changedTouches[0].pageX;
    var disX = currPoint - startPoint;
    var left = startEle + disX;
    box.style.left = left + &#39;px&#39;;
  });
  //当手指抬起的时候，判断图片滚动离左右的距离，当
  wrap.addEventListener("touchend",function(e){
    var left = box.offsetLeft;
// 判断正在滚动的图片距离左右图片的远近，以及是否为最后一张或者第一张
    var currNum = Math.round(-left/aLiWidth);
    currNum = currNum>=(aLi.length-1) ? aLi.length-1 : currNum;
    currNum = currNum<=0 ? 0 : currNum;
    box.style.left = -currNum*wrap.offsetWidth + &#39;px&#39;;
  })

</script>

</body>
</html>

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