Implementing carousel with native JavaScript

Implementing carousel with native JavaScript

This article shares the specific code for implementing the carousel in JavaScript for your reference. The specific content is as follows

Effect:

Code:

<!DOCTYPE html>
<html>

 <head>
 <meta charset="UTF-8">
 <title></title>
 <style>
 * {
 margin: 0;
 padding: 0;
 }
 
 ul,
 li {
 list-style: none;
 }
 
 .banner {
 width: 1200px;
 height: 535px;
 border: 1px solid red;
 margin: 0 auto;
 position: relative;
 }
 
 .slider li {
 position: absolute;
 left: 0;
 top: 0;
 }
 
 a {
 width: 40px;
 height: 50px;
 background-color: rgba(0, 0, 0, 0.1);
 font-size: 50px;
 text-align: center;
 line-height: 50px;
 position: absolute;
 text-decoration: none;
 color: gray;
 }
 
 .btnl {
 left: 0;
 top: 50%;
 margin-top: -15px;
 }
 
 .btnr {
 right: 0;
 top: 50%;
 margin-top: -25px;
 }
 
 .tabs {
 position: absolute;
 bottom: 20px;
 left: 50%;
 margin-left: -75px;
 }
 
 .tabs li {
 width: 15px;
 height: 15px;
 background-color: #ccc;
 border-radius: 50%;
 float: left;
 margin-right: 10px;
 }
 </style>
 </head>

 <body>
 <div class="banner">
 <ul class="slider">
 <li><img src="img/b1.jpg" alt="" /></li>
 <li><img src="img/b2.jpg" alt="" /></li>
 <li><img src="img/b3.jpg" alt="" /></li>
 <li><img src="img/b4.jpg" alt="" /></li>
 <li><img src="img/b5.jpg" alt="" /></li>
 <li><img src="img/b6.jpg" alt="" /></li>
 </ul>
 <a href="javascript:void(0);" class="btnl">
 <</a>
 <a href="javascript:void(0);" class="btnr">></a>
 <ul class="tabs">
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 </ul>
 </div>
 <script type="text/javascript">
 var banner = document.getElementsByClassName("banner")[0];
 var slider = document.getElementsByClassName("slider")[0];
 var li = slider.getElementsByTagName("li");
 var btnl = document.getElementsByClassName("btnl")[0];
 var btnr = document.getElementsByClassName("btnr")[0];
 var tabs = document.getElementsByClassName("tabs")[0];
 var btns = tabs.getElementsByTagName("li");

 //Initialize btns[0].style.backgroundColor = "red";

 for(var i = 0; i < li.length; i++) {
 if(i == 0) {
 continue;
 } else {
 li[i].style.opacity = 0;
 }
 }

 var timer = setInterval(mover, 1000);

 //Declare a variable to represent the subscript of the current image var num = 0;

 function mover() {
 num++;
 if(num == li.length) {
 num = 0;
 }
 for(var i = 0; i < li.length; i++) {
 li[i].style.opacity = 0;
 btns[i].style.backgroundColor = "#ccc";
 }
 li[num].style.opacity = 1;
 btns[num].style.backgroundColor = "red";

 }

 function movel() {
 num--;
 if(num == -1) {
 num = li.length - 1;
 }
 for(var i = 0; i < li.length; i++) {
 li[i].style.opacity = 0;
 btns[i].style.backgroundColor = "#ccc";
 }
 li[num].style.opacity = 1;
 btns[num].style.backgroundColor = "red";
 }

 banner.onmouseover = function() {
 clearInterval(timer)
 }

 banner.onmouseout = function() {
 timer = setInterval(mover, 1000)
 }

 btnl.onclick = function(e) {
 movel();
 }
 btnr.onclick = function(e) {
 mover();
 }

 // Small dot effect for(var i = 0; i < btns.length; i++) {
 btns[i].index = i;
 btns[i].onmouseover = function() {
 if(this.index == num) {
 return;
 } else {
 for(var i = 0; i < li.length; i++) {
 li[i].style.opacity = 0;
 btns[i].style.backgroundColor = "#ccc";
 }
 li[this.index].style.opacity = 1;
 btns[this.index].style.background="red";
 num=this.index;
 }
 }
 }
 </script>
 </body>

</html>

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

You may also be interested in:
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  • Use html+js+css to achieve page carousel effect (example explanation)
  • Implementing carousel chart based on vue.js carousel component vue-awesome-swiper

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