Jquery code to achieve image carousel effect (1)_javascript skills-JS Tutorial-php.cn

Jquery code to achieve image carousel effect (1)_javascript skills

WBOY

Release： 2016-05-16 15:45:42

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The article is not well written, so I would like to ask experts for advice. Without further ado, let’s take a look at the rendering:

Online demo Download source code

The first is the initialization part: hide all pictures except the first carousel picture, hide the forward and backward buttons, and make the first index button active.

Event part: Bind the mouse up and leave event processing through jquery's hover() method. jquery's bind() method binds the mouse click event processing for forward, backward flipping, and carousel control: pre() , next(), play(), start() starts automatic rotation, and stop() stops automatic rotation.

The next article is a pure jquery carousel plug-in, which can customize various effects, convenient configuration and extensibility.

The following is the overall code:

index.html
[html] view plaincopy
<!DOCTYPE html> 
<html> 
<head> 
<meta charset="UTF-8"> 
<title>jquery轮播效果图 </title> 
<script type="text/javascript" src="scripts/jquery-1.9.1.js"></script> 
<style type="text/css"> 
 * { 
  padding: 0px; 
  margin: 0px; 
 } 
 a { 
  text-decoration: none; 
 } 
 ul { 
  list-style: outside none none; 
 } 
 .slider, .slider-panel img, .slider-extra { 
  width: 650px; 
  height: 413px; 
 } 
 .slider { 
  text-align: center; 
  margin: 30px auto; 
  position: relative; 
 } 
 .slider-panel, .slider-nav, .slider-pre, .slider-next { 
  position: absolute; 
  z-index: 8; 
 } 
 .slider-panel { 
  position: absolute; 
 } 
 .slider-panel img { 
  border: none; 
 } 
 .slider-extra { 
  position: relative; 
 } 
 .slider-nav { 
  margin-left: -51px; 
  position: absolute; 
  left: 50%; 
  bottom: 4px; 
 } 
 .slider-nav li { 
  background: #3e3e3e; 
  border-radius: 50%; 
  color: #fff; 
  cursor: pointer; 
  margin: 0 2px; 
  overflow: hidden; 
  text-align: center; 
  display: inline-block; 
  height: 18px; 
  line-height: 18px; 
  width: 18px; 
 } 
 .slider-nav .slider-item-selected { 
  background: blue; 
 } 
 .slider-page a{ 
  background: rgba(0, 0, 0, 0.2); 
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#33000000,endColorstr=#33000000); 
  color: #fff; 
  text-align: center; 
  display: block; 
  font-family: "simsun"; 
  font-size: 22px; 
  width: 28px; 
  height: 62px; 
  line-height: 62px; 
  margin-top: -31px; 
  position: absolute; 
  top: 50%; 
 } 
 .slider-page a:HOVER { 
  background: rgba(0, 0, 0, 0.4); 
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#66000000,endColorstr=#66000000); 
 } 
 .slider-next { 
  left: 100%; 
  margin-left: -28px; 
 } 
</style> 
<script type="text/javascript"> 
 $(document).ready(function() { 
  var length, 
   currentIndex = 0, 
   interval, 
   hasStarted = false, //是否已经开始轮播 
   t = 3000; //轮播时间间隔 
  length = $('.slider-panel').length; 
  //将除了第一张图片隐藏 
  $('.slider-panel:not(:first)').hide(); 
  //将第一个slider-item设为激活状态 
  $('.slider-item:first').addClass('slider-item-selected'); 
  //隐藏向前、向后翻按钮 
  $('.slider-page').hide(); 
  //鼠标上悬时显示向前、向后翻按钮,停止滑动，鼠标离开时隐藏向前、向后翻按钮，开始滑动 
  $('.slider-panel, .slider-pre, .slider-next').hover(function() { 
   stop(); 
   $('.slider-page').show(); 
  }, function() { 
   $('.slider-page').hide(); 
   start(); 
  }); 
  $('.slider-item').hover(function(e) { 
   stop(); 
   var preIndex = $(".slider-item").filter(".slider-item-selected").index(); 
   currentIndex = $(this).index(); 
   play(preIndex, currentIndex); 
  }, function() { 
   start(); 
  }); 
  $('.slider-pre').unbind('click'); 
  $('.slider-pre').bind('click', function() { 
   pre(); 
  }); 
  $('.slider-next').unbind('click'); 
  $('.slider-next').bind('click', function() { 
   next(); 
  }); 
  /** 
   * 向前翻页 
   */ 
  function pre() { 
   var preIndex = currentIndex; 
   currentIndex = (--currentIndex + length) % length; 
   play(preIndex, currentIndex); 
  } 
  /** 
   * 向后翻页 
   */ 
  function next() { 
   var preIndex = currentIndex; 
   currentIndex = ++currentIndex % length; 
   play(preIndex, currentIndex); 
  } 
  /** 
   * 从preIndex页翻到currentIndex页 
   * preIndex 整数，翻页的起始页 
   * currentIndex 整数，翻到的那页 
   */ 
  function play(preIndex, currentIndex) { 
   $('.slider-panel').eq(preIndex).fadeOut(500) 
    .parent().children().eq(currentIndex).fadeIn(1000); 
   $('.slider-item').removeClass('slider-item-selected'); 
   $('.slider-item').eq(currentIndex).addClass('slider-item-selected'); 
  } 
  /** 
   * 开始轮播 
   */ 
  function start() { 
   if(!hasStarted) { 
    hasStarted = true; 
    interval = setInterval(next, t); 
   } 
  } 
  /** 
   * 停止轮播 
   */ 
  function stop() { 
   clearInterval(interval); 
   hasStarted = false; 
  } 
  //开始轮播 
  start(); 
 }); 
</script> 
</head> 
<body> 
 <div class="slider"> 
  <ul class="slider-main"> 
   <li class="slider-panel"> 
    <a href="http://www.jb51.net" target="_blank"><img alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills" src="images/1.jpg"></a> 
   </li> 
   <li class="slider-panel"> 
    <a href="http://www.jb51.net" target="_blank"><img alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills" src="images/2.jpg"></a> 
   </li> 
   <li class="slider-panel"> 
    <a href="http://www.jb51.net" target="_blank"><img alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills" src="images/3.jpg"></a> 
   </li> 
   <li class="slider-panel"> 
    <a href="http://www.jb51.net" target="_blank"><img alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills" src="images/4.jpg"></a> 
   </li> 
  </ul> 
  <div class="slider-extra"> 
   <ul class="slider-nav"> 
    <li class="slider-item">1</li> 
    <li class="slider-item">2</li> 
    <li class="slider-item">3</li> 
    <li class="slider-item">4</li> 
   </ul> 
   <div class="slider-page"> 
    <a class="slider-pre" href="javascript:;;"><</a> 
    <a class="slider-next" href="javascript:;;">></a> 
   </div> 
  </div> 
 </div> 
</body> 
</html>

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At this point, a simple jquery carousel effect is completed. Of course, there are still many areas for improvement.