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JavaScript implements image carousel effect_javascript skills

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May 16, 2016 pm 03:19 PM

javascriptImage Carousel

The example in this article introduces the detailed code of javascript to achieve the image carousel effect, and shares it with everyone for your reference. The specific content is as follows

Rendering:

Specific code:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
  *{
    margin: 0;
    padding: 0;
  }
   .wrap{
     width: 510px;
     margin: 0 auto;
     overflow: hidden;
      position: relative;
   }
   .caktye{
     width: 9999px;
     overflow: hidden;
     position: relative;
     left: 0;
   }
   .main{
     text-align: center;
      position: absolute;
      bottom: 10px;
      /*border: 1px solid red;*/
      left: 35%;

   }
   .main button{
     width: 25px;
      height: 25px;
      text-align: center;
      line-height: 25px;
      border-radius: 25px;
      display: inline-block;
      border: none;
   }
   .active{
     background-color: yellow;
   }
   .caktye a{
     float: left;
   }
   .caktye img {
      display: block;
      width:510px;
    }
   #prevBtn{
        display: block;
        position: absolute;
        left: 5px;
        bottom: 45%;
      width: 15px;
      height: 15px;
      /*overflow: hidden;*/
      border-left: 5px solid ;
      border-top: 5px solid ;
       border-color: rgba(255,255,255,0.5);
      -webkit-transform: rotate(45deg);
      transform: rotate(-45deg);
   }
   #nextBtn{
      display: block;
      position: absolute;
      right: 5px;
      bottom: 45%;
      width: 15px;
      height: 15px;
      /*overflow: hidden;*/
      border-right: 5px solid;
      border-top: 5px solid;
      -webkit-transform: rotate(45deg);
      transform: rotate(45deg);
      border-color: rgba(255,255,255,0.5);
      /*background-color: rgba(255,255,255,0.8);*/
   }

  </style>
</head>
<body>
 
  <div class="wrap">
   <div class="caktye" id="inner">
    <a href="###"><img  src="/static/imghwm/default1.png"  data-src="img/1.jpg"  class="lazy" alt="JavaScript implements image carousel effect_javascript skills" ></a>
    <a href="###"><img  src="/static/imghwm/default1.png"  data-src="img/2.jpg"  class="lazy" alt="JavaScript implements image carousel effect_javascript skills" ></a>
    <a href="###"><img  src="/static/imghwm/default1.png"  data-src="img/3.jpg"  class="lazy" alt="JavaScript implements image carousel effect_javascript skills" ></a>
    <a href="###"><img  src="/static/imghwm/default1.png"  data-src="img/4.jpg"  class="lazy" alt="JavaScript implements image carousel effect_javascript skills" ></a>
    <a href="###"><img  src="/static/imghwm/default1.png"  data-src="img/5.jpg"  class="lazy" alt="JavaScript implements image carousel effect_javascript skills" ></a>
      <a href="###"><img  src="/static/imghwm/default1.png"  data-src="img/1.jpg"  class="lazy" alt="JavaScript implements image carousel effect_javascript skills" ></a>
   </div>
    <div class="main">
      <button class="active">1</button>
      <button>2</button>
      <button>3</button>
      <button>4</button>
      <button>5</button>
   </div>
   <div>
      <a href="###" id="prevBtn"></a>
      <a href="###" id="nextBtn"></a>

   </div>
  </div>   
  <script type="text/javascript">
   var innerList = document.getElementById("inner");
   var btnList = document.getElementsByTagName("button");
   var perWidth = inner.children[0].offsetWidth;
   var prevBtn = document.getElementById("prevBtn");
   var nextBtn = document.getElementById("nextBtn");
   // var imgList = inner.getElementsByTagName("img");
   
   // var perWidth = imgList[0].offsetWidth;
   var timer = 0;
   var timer1 = 0;
   var index =0;
   var runFlag = true; //设置一个动画是否走完的标志位

   for(var i = 0; i < btnList.length; i++) {
      btnList[i].index = i;
      btnList[i].onclick = function() {
         index = this.index;
         
         tab();
      }
   }
   function tab() {
      var start = inner.offsetLeft;
      var end = - perWidth * index;
      var change = end - start;
      var t = 0;
      var maxT = 30;

      clearInterval(timer1);
      timer1 = setInterval(function() {
         t++;
         if(t >= maxT) {
            clearInterval(timer1);
            // alert("停下来了");
            runFlag = true;
         }
         inner.style.left = change/maxT * t + start + "px";
         if(index == btnList.length && t >= maxT) {
            inner.style.left = 0;
         }
      },30)

      // inner.style.left = - perWidth * index + "px";
      for(var j = 0; j < btnList.length; j++) {
         btnList[j].className = "";
      }
      if(index >= btnList.length) {
         btnList[0].className = "active";
      }else {
         btnList[index].className = "active";
      }
      
   }
    function xunhuan(){
       index++;
   
         if(index>btnList.length){
         index=1;
         }
         // inner.style.left = - perWidth * index + "px";
       tab();
   }

   var timer =setInterval(xunhuan,5000);

   inner.onmouseover =function(){
   clearInterval(timer);
   }
   inner.onmouseout =function(){
    timer = setInterval(xunhuan,5000);
   }

   function next() {
      index++;
      if(index > btnList.length) {
         index = 1;
      }
      tab();
   }
   function prev() {
      index--;
      if(index < 0 ) {
         index = btnList.length - 1;
         inner.style.left = - btnList.length * perWidth + "px";
         console.log(index);
      }
      tab();
   }
   //下一张
   nextBtn.onclick = function() {
      clearInterval(timer);
      if(runFlag) {
         next();
      }
      runFlag = false;
      
   }
   //上一张
   prevBtn.onclick = function() {
      clearInterval(timer);
      if(runFlag) {
         prev();
      }
      runFlag = false;
      
   }
  </script>
</body>
</html>

I hope this article will be helpful to everyone learning JavaScript programming.

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