jquery实现简单实用的轮播器

WEB开发经常实用到一种情况，即某个容器内的各项轮流循环播放显示，同时有相应的导航条提示，因为这个在很多地方可以使用，而且功能很相似的，所以写一个这样的播放功能，共享一下，需要注意的是这个需要jQuery的支持, 这个自己网上搜索下载即可，下面总结出来如下，直接看代码，

一、把如下保存为一个独立的文件 itemPlayerApp.js ：

//attend: this need jQuery.js support
var itemPlayerApp={
 author:'shenzhenNBA',
 version:'v1.0',
 appMaxNum:0,
 playData:'1xplay',
 playerID:"",
 speed:3000,
 appPlay:function(){
  var f=this.playData.toLowerCase().split('x');
  if(f[1]=='play'){
   var i;
   try{i=parseInt(f[0]);}catch(e){i=0;}
   if(i>=this.appMaxNum){i=0;}
   this.appTab(i);
   this.playData=(++i)+"xplay";
  }
 },
 appTab:function(tabIndex){
  var k,j;
  try{k=parseInt(tabIndex);}catch(e){k=0;}
  for(j=0;j<this.appMaxNum;j++){
   if(k==j){
   $('#itemNav'+j).css({'background-color':'#333333','color':'#FFFFFF'});
   $('#item'+j).show('fast');
   }else{
   $('#itemNav'+j).css({'background-color':'#CCCCCC','color':'#000000'});
   $('#item'+j).hide('fast');
   }
  }
 },
 appActive:function(){
  var _this = this;
  this.playerID = setInterval(function(){ _this.appPlay(); },this.speed);
 },
 init:function(refContainerId,intervalTime,refWidth,refHeight){
  var cid = "";
  var w = 300;
  var h = 200;
  if(refContainerId == 'undefined' || refContainerId == null || refContainerId == ''){
   return;
  }else{
   cid = $.trim(refContainerId);
  }
  if(refWidth == 'undefined' || refWidth == null || refWidth == ''){
   w = 300;
  }else{
   w = parseInt(refWidth);
  }
  if(refHeight == 'undefined' || refHeight == null || refHeight == ''){
   h = 200;
  }else{
   h = parseInt(refHeight);
  }  

  $('#' + cid).css({"position":"relative",'width':w,'height':h,'overflow':'hidden'});
  $('#' + cid + "NavCon").css({'color':'#333333','height':'26px','position':'absolute','width':'95%','left':'0','bottom':'3px','text-align':'right','display':'block'});
  var t = 0;
  if(intervalTime == 'undefined' || intervalTime == null){
   t = 3000;
  }else{
   try{ t = parseInt(intervalTime);}catch(e){ t = 3000;}
  }
  this.speed = t;
  var navList = "#" + cid + "NavCon a";
  this.appMaxNum = $(navList).size();
  if(0 == this.appMaxNum){ return; }
  var _this = this;
  $(navList).each(function(i){
   $(this).css({'padding':'2px 5px','margin-right':'2px','background-color':'#CCCCCC'});
   if(i == 0){
    $(this).css({'background-color':'#333333','color':'#FFFFFF'});
   }
   $(this).mouseover(function(){
   _this.playData=i+'xstop';
   _this.appTab(i);
   });
   $(this).mouseout(function(){
   _this.playData=i+'xplay';
   _this.appTab(i);
   });
  });
 }
};

二、如何使用：

1.需要使用的web页面中引入jQery文件和本 itemPlayerApp.js 文件，例如:

<script language="javascript" src="xpath/itemPlayer.js"></script>

2.建立如下格式的HTML文件

<div id="containerID">

<div id="containerIDNavCon">
<a id="itemNav0" class="item1" href="#">1</a>
<a id="itemNav1" class="item1" href="#">2</a>
<a id="itemNav2" class="item1" href="#">3</a>
</div>
<div id="containerIDItemCon">
<a id="item0" href="#"><img src="img/pic0.jpg" width="300" height="200"></a>
<a id="item1" href="#"><img src="img/pic1.jpg" width="300" height="200"></a>
<a id="item2" href="#"><img src="img/pic2.jpg" width="300" height="200"></a>
</div>
</div>

注意：因为尽量简单，所以需要建立适当格式的HTML,主要要求如下，注意颜色部分，

//A, id = containerIDNavCon和 id = containerIDItemCon 中的连接 A 元素的数量应该相等；
//B, 导航容器的 ID 构成应为主容器 ID 加上 NavCon，如上 containerIDNavCon；
//C, 导航容器中的每个 A 元素的 ID 构成为，itemNav 加上以0开始的递增数字序列，如上面的绿色部分；
//D, 显示项目容器内的每个 A 元素的 ID 构成为，item 加上以0开始的递增数字序列，如上面的紫色部分；

3.在WEB页面中的加载事件onload，初始化和启用该轮播功能，例如:
window.onload=function(){
itemPlayerApp.init('containerID',3000,300,200);
itemPlayerApp.active();
}

三、如下一个例子

假如所有文件都放在一个文件夹里，

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>TEST</title>
<script language="javascript" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<script language="javascript" type="text/javascript" src="itemPlayerApp.js"></script>
<style type="text/css">
*{font-family:"宋体",verdana,arial; font-size:12px;color:#000000;}
#playerBox{font-family:"宋体",verdana,arial; font-size:12px;color:#000000;}
</style>
</head>
<body>
<div id="playerBox" class="columnLeft01 box02">
<div id="playerBoxNavCon">
<a id="itemNav0" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a>
<a id="itemNav1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >2</a>
<a id="itemNav2" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >3</a>
</div>
<div id="playerBoxItemCon">
<a id="item0" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif" width="100%" height="200" border="0"></a>
<a id="item1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://csdnimg.cn/www/images/csdnindex_logo.gif" width="100%" height="200" border="0"></a>
<a id="item2" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://avatar.csdn.net/5/1/9/1_shenzhennba.jpg" width="100%" height="200" border="0"></a>
</div>
</div>
<p> </p>
<p>项目循环轮播功能</p>
<script language="javascript" type="text/javascript">
window.onload=function(){
itemPlayerApp.init('playerBox',3000,300,200);
itemPlayerApp.appActive();
}
</script>
</body>
</html>

提示: jQuery.js 的文件请网上自己下载。
在使用到的时候直接使用即可。

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