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js implements smooth carousel at the beginning and end of images

小云云
小云云Original
2018-01-15 14:16:451483browse

This article mainly brings you an article to achieve smooth carousel of the beginning and end of pictures (JS native method - throttling). The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

First give the HTML code. Please note that the first picture 1.jpg is added to the end of the carousel picture list (#list), and the last picture 5.jpg is added to the header. 


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>首尾轮播</title>
 <link rel="stylesheet" href="首尾轮播.css" rel="external nofollow" >
<script src="首尾轮播.js"></script>
</head>
<body>
 <p id="container">
  <p id="list">
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/5.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/1.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/2.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/3.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/4.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/5.jpg" alt=""></a></p>
   <p><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="../imgs/1.jpg" alt=""></a></p>
  </p>

  <p class="arrow" id="prev"><</p>
  <p class="arrow" id="next">></p>


 </p>  

</body> 

</html>

Next, the css and js codes are given. You can adjust the parameters of the container and list according to the size, quantity, and width of the images as appropriate. This is also what you need to consider when encapsulating JS. parameters. 


*{
 margin: 0;
 padding: 0;
}

#container{
 height: 400px;
 width: 500px;
 margin: 0 auto;
 position: relative;
 overflow: hidden;
 border: 1px solid black;
}

#list>p {
 float: left;
}
#list{
 position: absolute; 
 height: 400px;
 width: 3600px;
 
}

#list img{
 height: 400px;
 width: 500px;
}
.arrow {
 user-select:none;
 position: absolute;
 top:150px;
 z-index: 2;
 background-color: #aaa;
 height: 100px;
 width: 80px;
 cursor: pointer;
 opacity: 0.5;
 display: none;
 line-height: 100px;
 text-align: center;
 color: #222;
 font-size: 3em;

}
#container:hover .arrow{
 display: block;
}
 #prev{
 left:20px;
}

 #next{
 right: 20px;
}

In JS, we can control the speed of image switching by changing the speed variable....Here we use element.style.transition to control the transition effect. .


window.onload=function(){
 var container = document.getElementById(&#39;container&#39;);
 var list = document.getElementById(&#39;list&#39;);//获取图片容器
 var prev = document.getElementById(&#39;prev&#39;);//向前按钮
 var next = document.getElementById(&#39;next&#39;);//向后按钮
 var nowP = 1; //显示位置
 var judge = null; //执行权
 var speed = 0.1; // 切换速度 秒
 prev.onclick=function(){
  if(!judge){
    judge = setTimeout(function(){
     if(nowP==1){setTimeout(function(){
      list.style.transition="left 0s";
     list.style.left = "-2500px";　
     nowP = 5;},speed*1000);} //当到达图片表左边缘时与动画同步切换 
     list.style.transition = "left "+speed+"s";
    move(500);
    nowP--;
    judge = null;
   },speed*1000);
  }
 };
 next.onclick=function(){
  if(!judge){    
    judge = setTimeout(function(){
     if(nowP==5){setTimeout(function(){
      list.style.transition="left 0s";
     list.style.left = "-500px"; 
     nowP = 1;},speed*1000);} //当到达图片表右边缘时与动画同步切换 
    list.style.transition = "left "+speed+"s";
    move(-500);
    nowP++;
    judge = null;
   },speed*1000);
  }

 };

 function move(num){
  var term = parseInt(list.style.left) + num ; 
  list.style.left = term+"px";
 }

 var roll= setInterval(function(){
  next.onclick();
 },2000);

 container.onmouseenter=function(){
  clearInterval(roll);
 };

 container.onmouseleave=function()
  {
  roll=setInterval(function(){
  next.onclick();
  },2000);
 };

 
};

The following is a demonstration demo. In simple terms, the principle is to set a delayed execution time and animation transition when switching to the beginning and end of the picture table animation. The setTimeout function with the same time is used to perform instant switching, and then throttling is used to ensure the maximum switching speed (speed).

I am also a beginner in front-end. If it is helpful, please click on the recommendation.

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