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JS easily implements carousel images

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Apr 18, 2018 pm 05:10 PM

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This time I will bring you JS to easily implement carousel images. What are the precautions for easily implementing carousel images with JS. The following is a practical case, let’s take a look.

Thoughts:

1. First, there must be a container to hold images, set to the width and height of a single image, and overflow: hidden, so as to ensure that only one image can be displayed at a time
2. There is a list of images in the Container for positioning Positioning, the pictures are in float mode, and when the pictures are rotated, changing the Left value of the list causes the pictures displayed to change.
3. The picture carousel uses a timer. Change the Left value of the list through the timer so that the pictures are displayed in a loop.
4. When the mouse slides over the picture, clear the timer and the picture will stop carousing. When the mouse is Continue the carousel when removed
5. There is a group of small dots on the picture to correspond to the currently displayed picture. At the same time, you can click to view the corresponding picture
6. The picture can be slid left and right by clicking show

Code:

<!DOCTYPE html>
<htmllang="en">
<head>
 <metacharset="UTF-8">
 <title>轮播图</title>
 <styletype="text/css">
  .container{
   margin:0 auto;
   width:600px;
   height:400px;
   position: relative;
   overflow: hidden;
   border:4px solid gray;
   box-shadow: 3px 3px 5px gray;
   border-radius:10px;
  }
  .list{
   width:4200px;
   height:400px;
   position: absolute;
   top:0px;
  }
  img{
   float:left;
   width:600px;
   height:400px;
  }
  .dots{
   position: absolute;
   left:40%;
   bottom:30px;
   list-style: none;
  }
  .dots li{
   float:left;
   width:8px;
   height:8px;
   border-radius: 50%;
   background: gray;
   margin-left:5px
  }
  .dots .active{
   background: white;
  }
  .pre,.next{
   position: absolute;
   top:40%;
   font-size:40px;
   color:white;
   text-align:center;
   background: rgba(128,128,128,0.5);
   /* display:none;*/
  }
  .pre{
   left:30px;
  }
  .next{
   right:30px;
  }
 </style>
</head>
<body>
 <pclass="container">
  <pclass="list"style=" left:-600px;">
   <img  src="/static/imghwm/default1.png"  data-src="img/5.jpg"  class="lazy" alt="JS easily implements carousel images" >
   <img  src="/static/imghwm/default1.png"  data-src="img/1.jpg"  class="lazy" alt="JS easily implements carousel images" >
   <img  src="/static/imghwm/default1.png"  data-src="img/2.jpg"  class="lazy" alt="JS easily implements carousel images" >
   <img  src="/static/imghwm/default1.png"  data-src="img/3.jpg"  class="lazy" alt="JS easily implements carousel images" >
   <img  src="/static/imghwm/default1.png"  data-src="img/4.jpg"  class="lazy" alt="JS easily implements carousel images" >
   <img  src="/static/imghwm/default1.png"  data-src="img/5.jpg"  class="lazy" alt="JS easily implements carousel images" >
   <img  src="/static/imghwm/default1.png"  data-src="img/1.jpg"  class="lazy" alt="JS easily implements carousel images" >
  </p>
  <ulclass="dots">
   <liindex=1class="active dot"></li>
   <liindex=2class="dot"></li>
   <liindex=3class="dot"></li>
   <liindex=4class="dot"></li>
   <liindex=5class="dot"></li>
  </ul>
  <pclass="pre"><</p>
  <pclass="next">></p>
 </p>
<scripttype="text/javascript">
 var index=1,timer;
 function init(){
  eventBind();
  autoPlay();
 }
 init();
 function autoPlay(){
   timer =setInterval(function () {
   animation(-600);
   dotIndex(true);
  },1000)
 }
 function stopAutoPlay() {
  clearInterval(timer);
 }
 function dotIndex(add){
  if(add){
   index++;
  }
  else{
   index--;
  }
  if(index>5){
   index = 1;
  }
  if(index<1){
   index=5;
  }
  dotActive();
 }
 function dotActive() {
  vardots=document.getElementsByClassName("dot");
  varlen=dots.length;
  for(vari=0;i<len ;i++){
   dots[i].className="dot";
  }
 
  for(vari=0;i<len;i++){
   /*此处可以不用parseInt，当不用全等时*/
   if(index === parseInt(dots[i].getAttribute("index"))){
    dots[i].className="dot active";
   }
  }
 }
 function eventBind(){
  /*点的点击事件*/
  vardots=document.getElementsByClassName("dot");
  varlen=dots.length;
  for(vari=0;i<len;i++){
   (function(j){
    dots[j].onclick=function(e){
     varind=parseInt(dots[j].getAttribute("index"));
     animation((index - ind)*(-600));/*显示点击的图片*/
     index= ind;
     dotActive();
    }
   })(i)
  }
  /*容器的hover事件*/
  varcon=document.getElementsByClassName("container")[0];
  /*鼠标移动到容器上时，停止制动滑动，离开时继续滚动*/
  con.onmouseover=function(e) {
   stopAutoPlay();
  }
  con.onmouseout=function(e){
   autoPlay();
  }
  /*箭头事件的绑定*/
   varpre=document.getElementsByClassName("pre")[0];
   varnext=document.getElementsByClassName("next")[0];
   pre.onclick=function(e) {
    dotIndex(false);
    animation(600);
   }
  next.onclick=function(e) {
   dotIndex(true);
   animation(-600);
  }
 }
 function animation(offset){
  varlists=document.getElementsByClassName("list")[0];
  varleft=parseInt(lists.style.left.slice(0,lists.style.left.indexOf("p"))) + offset;
  if(left<-3000){
   lists.style.left="-600px";
  }
  else if(left>-600){
   lists.style.left = "-3000px";
  }
  else{
   lists.style.left = left+"px";
  }
 }
</script>
</body>
</html>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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