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JavaScript implements seamless scrolling effect of carousel images

陈政宽～

Jun 28, 2017 am 11:40 AM

javascript

This article mainly introduces the seamless scrolling effect of js carousel chart in detail, which has a certain reference value. Interested friends can refer to it

How to start and end the carousel chart when making it If they cannot be connected, the effect will be a bit ugly. Here is a method I commonly use:

Let me explain in words first:

If you want to display 5 pictures, they are 1, 2, and 3. ,4,5 So the introduction of the code is like this: 1,2,3,4,5,1

I won’t go into detail here about the sequential rotation. The main point is 5>1 and 1>5 carousel

i represents the index of the current picture

pre represents the button of the previous picture

next represents the button of the next picture

ul represents the picture list

(1) 5>1>2... When the "next" button goes from 5 to 1, it rotates normally in order, and when the current picture is the second "1" , the next picture should be "2", then when "next", the left value of ul is 0, i==1;

(2) 1>5>4.... When When the "pre" button rotates from the current picture "1" (the first 1) to picture 5, i==4, the left value of ul becomes -5 times the width of img, that is, the first 1 is quietly Becomes the last 1;

It’s a bit confusing to express it in language, so let’s put the code below:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
 <style type="text/css">
 *{padding: 0;margin: 0;}
 .container{
  width: 273px;height: 163px;overflow: hidden;
  position: relative;margin: 0 auto;
 }
 .list{
  position: absolute;width: 1638px;top: 0;left: 0px;
 }
 .list li{
  float: left;list-style: none;
 }
 .btn{
  position: absolute;display: block;width: 40px;height: 50px;font-size: 40px;
  text-align: center;font-weight: bold;top: 50%;margin-top: -25px;background-color: rgba(255,255,255,0.5);cursor:pointer;
 }
 .btn:hover{
  background-color: rgba(0,0,0,0.3);color: #fff;
 }
 .pre{
  left: 0;
 }
 .next{
  right: 0;
 }
 .nav{
  position: absolute;bottom: 5px;display: flex;justify-content: center;width: 100%;
 }
 .nav span{
  width: 10px;height: 10px;border-radius: 10px;background-color: #fff;z-index: 2;display: inline-block;margin-right: 10px;cursor: pointer;
 }
 span.on{
  background-color: orange;
 }
 </style>
</head>
<body>
 <p class="container">
 <ul class="list" style="left: 0px">
  <li><img src="/static/imghwm/default1.png"  data-src="./images/1.png"  class="lazy"   alt=""></li>
  <li><img src="/static/imghwm/default1.png"  data-src="./images/2.png"  class="lazy"   alt=""></li>
  <li><img src="/static/imghwm/default1.png"  data-src="./images/3.png"  class="lazy"   alt=""></li>
  <li><img src="/static/imghwm/default1.png"  data-src="./images/4.png"  class="lazy"   alt=""></li>
  <li><img src="/static/imghwm/default1.png"  data-src="./images/5.png"  class="lazy"   alt=""></li>
  <li><img src="/static/imghwm/default1.png"  data-src="./images/1.png"  class="lazy"   alt=""></li>
 </ul>
 <p class="nav">
  <span class="on"></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
 </p>
 <em class="next btn">></em>
 <em class="pre btn"><</em>
 </p>
 <script type="text/javascript" src="../jquery.js"></script>
 <script type="text/javascript">
 $(function(){
  var i=0;
  $(&#39;.next&#39;).click(function(){
  i++;
  console.log(i);
 
  moveImg(i);
   
  });
  $(&#39;.pre&#39;).click(function(){
  i--;
  moveImg(i);
   
  });
  $(&#39;.nav span&#39;).click(function(){
  var _index=$(this).index();
  i=_index;
  moveImg(i);
 
   
  });
  // i的作用：决定下一张图片是谁————也就是说ul的left是多少。
  // $(&#39;.list&#39;).css({left)的值是从图a过度是此时的ul的left。
  function moveImg(){
  if (i==6) {
   i=1;
   $(&#39;.list&#39;).css({&#39;left&#39;:&#39;0&#39;});
  }
   // 是第一张
  if(i==-1){
   i=4;
   $(&#39;ul&#39;).css({left:(5*-273)});
  }
  $(&#39;.list&#39;).stop().animate({&#39;left&#39;:-273*i+&#39;px&#39;},1000);
  if (i==5) {
  $(&#39;.nav span&#39;).eq(0).addClass(&#39;on&#39;).siblings().removeClass(&#39;on&#39;);
 
  }
  $(&#39;.nav span&#39;).eq(i).addClass(&#39;on&#39;).siblings().removeClass(&#39;on&#39;);
 
  }
 })
 </script>
</body>
</html>

The above is the entire content of this article. I hope it will be helpful to everyone’s study, and I hope you can support me a lot. Script House.

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