How to implement mobile touch carousel in js-JS Tutorial-php.cn

How to implement mobile touch carousel in js

亚连

Release： 2018-06-19 10:25:06

Original

1184 people have browsed it

Below I will share with you a sample code for implementing native js to implement touch carousel on the mobile terminal. It has a good reference value and I hope it will be helpful to everyone.

It is very simple to realize the image carousel effect on the PC side. You can achieve the effect very simply by using the click event, but on the mobile side, it must be achieved through the core touch event.

The following is the complete code for the finger sliding carousel on the mobile terminal.

<!DOCTYPE html> 
<html>
<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">
<style>
*{margin:0;padding:0;}
li{list-style:none;}
.lb{width:320px;height:130px;position:relative;margin:20px auto;overflow: hidden;}
.lb .lb_img{width:2240px;height:130px;position:absolute;left:-320px;}
.lb .lb_img img{width:320px;height:130px;float:left;display:block;}
.lb ul{width:35px;height:4px;position:absolute;bottom:10px;left:50%;margin-left:-15px;}
.lb ul li{width:4px;height:4px;border-radius:2px;border:0.25px solid #fff;margin-left:2.5px;background:#666;float:left;cursor:pointer;}
.lb ul .active{background:#fff;}
.lb ul li:hover{background:#fff;}
</style>
</head>
<body>
<p class="lb">
		<p class="lb_img">
			<img src="img/4.jpg">
			<img src="img/0.jpg">
			<img src="img/1.jpg">
			<img src="img/2.jpg">
			<img src="img/3.jpg">
			<img src="img/4.jpg">
			<img src="img/0.jpg">
		</p>
		<ul>
			<li class="active"></li>
			<li></li>
			<li></li>
			<li></li>
			<li></li>
		</ul>
</p>	
<script>
var lb = document.querySelector(".lb");
var lb_img = document.querySelector(".lb .lb_img");
var img = document.querySelectorAll(".lb .lb_img img")
var lis = document.querySelectorAll(".lb ul li");
var i=2;
 // 初始化手指坐标点
 var startPoint = 0;
 var startEle = 0;
 //手指按下
 lb.addEventListener("touchstart",function(e){
 startPoint = e.changedTouches[0].pageX;
 startEle = lb_img.offsetLeft;
 clearInterval(Time)
 });
 
 //手指滑动
 lb.addEventListener("touchmove",function(e){
 var currPoint = e.changedTouches[0].pageX; 
 var disX = currPoint - startPoint;
 var left = startEle + disX;
 lb_img.style.left = left + "px"; 
 });
 //当手指抬起的时候，
 lb.addEventListener("touchend",function(e){
 	var currPoint = e.changedTouches[0].pageX;
 	var disX = - (currPoint - startPoint);
 var left = startEle + disX;
 if(disX > 150){
 		i++;
	 	for(var q=0;q<lis.length;q++){
	  lis[q].className = &#39;&#39;; 
	 }
	 if(i == 7){
	 	i=2;
	 }
	 lis[i-2].className= "active" ;	 	
 	lb_img.style.left = -320*(Math.round(disX/320)+i+1)+ &#39;px&#39;; 		
 }else{
 	lb_img.style.left = -320*(i-1) + "px";
 }
 if(disX < -150){
 	i--;
 	for(var q=0;q<lis.length;q++){
  lis[q].className = &#39;&#39;;
  }
  if(i == 1){
 		i=6;
 	}
 	lis[i-2].className= "active" ; 		
 	lb_img.style.left = -320*(Math.round(-disX/320)+i-2) + &#39;px&#39;;
	 	
 }else{
 	lb_img.style.left = -320*(i-1) + "px";
 }
 Time=setInterval(autoplay,2000);
 })
//设置定时器
Time=setInterval(autoplay,2000);
 function autoplay(){
 i++;
 for(var q=0;q<lis.length;q++){
 lis[q].className = &#39;&#39;; 
 }
 if(i == 7){
 i=2;
 }
 lis[i-2].className= "active" ; 
 for(var a=0; a<320;a++){
  setTimeout(function(){
   var left = lb_img.style.left ? lb_img.style.left : "-320px";
   left = parseInt(left)-1;
   if(left<-1920){
   left=-321;
   }
   lb_img.style.left = left + "px";
  },a);
 }
 }
</script>
</body>
</html>

Copy after login

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

How to query weather forecast in Angular

How to display input content in Angular

How to implement the schedule function in Angular

How to implement file upload in nodejs express

In Vue How to implement a blog management platform in SpringBoot

How to solve the maximum call stack error in nodejs

About asynchronous components in Vue Example

The above is the detailed content of How to implement mobile touch carousel in js. For more information, please follow other related articles on the PHP Chinese website!