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基于jquery实现左右按钮点击的图片切换效果

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jQuery可以制作出与Flash媲美的动画效果，这点绝对毋庸置疑，本文将通过实例演示一个左右按钮点击的图片切换效果。

一、最终效果


二、功能分析
1、需求分析
点击左边pre按钮，显示前面三个图片，点击右边的next按钮，显示后面的一组（三个）图片。初始化只显示next按钮，到最后一组只显示pre按钮，中间过程两按钮都显示。
2、html结构分析

 <div class="activity" id="activity-slide">
  <a href="javascript:void(0)" class="pg_left ps_pre"></a>
  <a href="javascript:void(0)" class="pg_right ps_next" ></a>
   <ul class="clearfix">
   <li><a href="javascript:;"><img src="images/activity01-1410.jpg"></a></li>
   <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
   <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
   <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
   <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
  </ul>
</div>

 #activity-slide是整个幻灯的入口，后面会将其作为参数来调用幻灯功能。

 两个按钮ps_pre和ps_next将添加click事件响应点击切换功能。

 3、功能分析
因为左右切换都是三个为一组的切换，如果li总个数不是3的倍数时，需要增加li节点填满。

//需要追加的li节点个数
var addli = 0;
//一组切换3个li
var num=3;
var lisize = a.find("ul li").size();//获取li个数

//判断需要添加的li节点数量
var reminder=lisize%num;
if(lisize%num!=0){addli = num-reminder;}
else{addli = 0;}
addlist();

上面是判断得到需要追加的个数lisize，然后调用addlist追加。

addlist如下，从ul的第一个li开始复制，需要几个就复制出几个节点追加。节点追加完毕后重新计算ul的宽度。    

 function addlist(){
   for(i=0;i<addli;i++){
    var html = a.find("ul li").eq(i).html();
    a.find("ul").append("<li>"+html+"</li>"); 
   }
   a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
  }

现在准备工作已经完成了。接下来就是给按钮添加响应事件。在幻灯切换时涉及到左右按钮的显示和隐藏，所以先说这个按钮显示功能，将此分装成一个函数btnshow。      

 /***
  参数说明：
  now:当前是第几组，默认是0
  c:总共有几组
  d:初始化时li的个数
  e:每组显示li个数
  ***/
  function btnshow(now,c,d,e){
   if(d<=e){//如果初始化时li的个数小于一组要显示的数，则不显示pre和next按钮
    a.find(".ps_next").hide();
    a.find(".ps_pre").hide();
   }else if(now==0){//初始化now=0，显示第一组，只显示next
    a.find(".ps_next").show();
    a.find(".ps_pre").hide(); 
   }else if(now==c-1){//显示到最后一组，只显示pre
    a.find(".ps_next").hide();
    a.find(".ps_pre").show(); 
   }else{//显示中间组，pre和next都需要显示
    a.find(".ps_next").show();
    a.find(".ps_pre").show();
   }
  }

 接下来幻灯切换。这里a是传入的参数，也就是 #activity-slide。给它下面的所以的pre和next添加响应。

向前一组，组数now减一，now是几，就让ul的margin-left为负几倍的组宽（即3倍的（li宽度+margin宽度）），然后显示对于按钮即可。

向后滑动一组li同理。       

 function photoscroll(){
   a.find(".ps_pre").on("click",function(){//console.log(num); 
    now--;
    if(now >= 0){     
     a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
     btnshow(now,parseInt((lisize+addli)/num),lisize,num);
    }
   });

   a.find(".ps_next").on("click",function(){//console.log(num); 
    now++;
    if(now < (lisize+addli)/num){ 
     a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
     btnshow(now,parseInt((lisize+addli)/num),lisize,num);
    } 
   }); 
   btnshow(now,parseInt((lisize+addli)/num),lisize,num);  
  }

三、实例代码
1、用到图片

2、完整代码

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" type="text/css" href="css/style.css">

<script>
window.onresize=function(){
 var winWidth = document.body.clientWidth;
 if(winWidth <=1180){
  body.className="grid-960"; 
 }else if (winWidth<= 1410){
  body.className="grid-1180"; 
 }else if (winWidth>1410){
  body.className="grid-1410"; 
 }else {
  alert("do not know!");
 }
}
</script>
</head>
<body id="body" class="">
<script>//初始化状态显示样式判断,放在body后面
var winWidth = document.body.clientWidth;
if (winWidth <=1180){
 body.className="grid-960"; 
}else if (winWidth<= 1410){
 body.className="grid-1180"; 
}else if (winWidth>1410){
 body.className="grid-1410"; 
}else {
 alert("do not know!");
}
</script>
<div class="wapper">
 
 <div class="section">
  <h2 class="title">热门活动</h2>
  <div class="activity" class="movie" id="activity-slide">
   <a href="javascript:void(0)" class="pg_left ps_pre"></a>
   <a href="javascript:void(0)" class="pg_right ps_next" ></a>
   <ul class="clearfix">
    <li><a href="javascript:;"><img src="images/activity01-1410.jpg"></a></li>
    <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
    <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
    <li><a href="javascript:;"><img src="images/activity03-1410.jpg"></a></li>
    <li><a href="javascript:;"><img src="images/activity02-1410.jpg"></a></li>
   </ul>
  </div>
 </div>

</div>


</body>
</html>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
//首页图片滚动切换
(function($){
 $.photolist=function(a){  
  var w_li = a.find("li").width();
  var h_li = a.find("li").height();
  var margin_li=parseInt(a.find("li").css("marginLeft"));
  var now = 0;
  var num = 0;
  var addli = 0;
  var lisize = a.find("ul li").size();
  var htmlall = a.find("ul").html();
  
  //判断每次滚动数量
  /*
  var w_body = $("body").width();
  if(w_body <=1170){
   var num = 3;
  }else if(w_body<= 1380){
   var num = 4;
  }else if(w_body>1380){
   var num = 5;
  }
  */
  var num=3;
  
  //判断需要添加的li节点数量
  var reminder=lisize%num;
  if(lisize%num!=0){addli = num-reminder;}
  else{addli = 0;}
  addlist();
  //点击滚动事件
  photoscroll();
  
  $(window).resize(function(){
   //location.reload();
   now = 0;
   addli = 0;
   a.find("ul").html(htmlall);//html内容还原初始值
   a.find(".ps_next").show();//按钮样式初始化
   a.find(".ps_pre").hide();
   //判断每次滚动数量
   /*
   var w_body = $("body").width();
   if(w_body <=1170){
    var num = 3;
   }else if(w_body<= 1380){
    var num = 4;
   }else if(w_body>1380){
    var num = 5;
   }
   */
   var num=3;
   //判断需要添加的li节点数量
   var reminder=lisize%num;
   if(lisize%num!=0){addli = num-reminder;}
   else{addli = 0;}
   addlist();
   w_li = a.find("li").width();
   margin_li=parseInt(a.find("li").css("marginLeft"));
   a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
   a.find("ul").animate({"margin-left":0});//ul位置还原
   btnshow(now,parseInt((lisize+addli)/num),lisize,num);
  });
  
  
  function addlist(){
   for(i=0;i<addli;i++){
    var html = a.find("ul li").eq(i).html();
    a.find("ul").append("<li>"+html+"</li>"); 
   }
   a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
   //console.log(a.find("ul li").size());
  }
  function photoscroll(){
   a.find(".ps_pre").on("click",function(){//console.log(num); 
    now--;
    if(now >= 0){     
     a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
     btnshow(now,parseInt((lisize+addli)/num),lisize,num);
    }
   });

   a.find(".ps_next").on("click",function(){//console.log(num); 
    now++;
    if(now < (lisize+addli)/num){ 
     a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
     btnshow(now,parseInt((lisize+addli)/num),lisize,num);
    } 
   }); 
   btnshow(now,parseInt((lisize+addli)/num),lisize,num);  
  }
  /***
  参数说明：
  now:当前是第几组，默认是0
  c:总共有几组
  d:初始化时li的个数
  e:每组显示li个数
  ***/
  function btnshow(now,c,d,e){
   if(d<=e){//如果初始化时li的个数小于一组要显示的数，则不显示pre和next按钮
    a.find(".ps_next").hide();
    a.find(".ps_pre").hide();
   }else if(now==0){//初始化now=0，显示第一组，只显示next
    a.find(".ps_next").show();
    a.find(".ps_pre").hide(); 
   }else if(now==c-1){//显示到最后一组，只显示pre
    a.find(".ps_next").hide();
    a.find(".ps_pre").show(); 
   }else{//显示中间组，pre和next都需要显示
    a.find(".ps_next").show();
    a.find(".ps_pre").show();
   }
  }
  
 }
})(jQuery); 
$.photolist($("#activity-slide"));
</script>

css部分：

@charset "utf-8";
body, div, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, code, form, fieldset, legend, button, textarea, table, tbody, tfoot, thead, th, td, article, aside, dialog, figure, footer, header, hgroup, menu, nav, section, time, mark, audio, video { margin: 0; padding: 0; outline:nonebackground:transparent;
}
article, aside, dialog, figure, footer, header, hgroup, nav, section { display: block; }
body, button, input, select, textarea { font: 12px/1.5 arial, \5b8b\4f53, sans-serif; }
h1, h2, h3, h4, h5, h6, button, input, select, textarea { font-size: 100%; outline: none }
address, cite, dfn, em, var { font-style: normal; }
code, kbd, pre, samp { font-family: courier new, courier, monospace; }
small { font-size: 12px; }
ul, ol, li { list-style: none; }
img { border: none; }
a { text-decoration: none; outline: thin none; }
a:hover { text-decoration: underline; }
table { border-collapse: collapse; border-spacing: 0; }
.clear { clear: both; }
.clearfix:after { visibility: hidden; display: block; font-size: 0; content: " "; clear: both; height: 0; }
html { -webkit-text-size-adjust: none; }
body { font: 12px/1.5 \5FAE\8F6F\96C5\9ED1, tahoma, arial, \5b8b\4f53, sans-serif; }



.grid-960 .wapper { width: 100%; min-width:960px;height: auto; margin: 0 auto; background: url(../images/bg-body-960.jpg) no-repeat center top; }
.grid-1180 .wapper { width: 100%; min-width:1180px;height: auto; margin: 0 auto; background: url(../images/bg-body-1180.jpg) no-repeat center top; }
.grid-1410 .wapper { width: 100%; min-width:1410px;height: auto; margin: 0 auto; background: url(../images/bg-body-1410.jpg) no-repeat center top; }

/*热门活动*/
.grid-960 .section { width: 960px; margin: 0 auto;background-color:#eaf2ff; }
.grid-1180 .section { width: 1180px; margin: 0 auto;background-color:#eaf2ff;}
.grid-1410 .section { width: 1410px; margin: 0 auto;background-color:#eaf2ff;}

.title{padding:0 102px;height:70px;line-height:70px;font-size:24px;font-weight:normal;color:#fff;text-shadow: 0 3px #df2828, 3px 0 #df2828;background:#cc2223 url(../images/bg-title.jpg) no-repeat left top;}

.viewall:hover{text-decoration:none;}
.viewall{font-size:18px;;color:#fff;text-shadow: 0 3px #df2828, 3px 0 #df2828;float:right;}

.grid-1410 .title {padding:0 116px;background-image:url(../images/bg-title-1410.jpg);}

.grid-960 .contentwrap{width:800px;margin:0 auto;}
.grid-1180 .contentwrap{width:980px;margin:0 auto;}
.grid-1410 .contentwrap{width:1180px;margin:0 auto;}

.grid-960 .activity{width:826px;height:152px;overflow:hidden;margin:0 auto;position:relative;}
.grid-1180 .activity{width:1020px;height:192px;overflow:hidden;margin:0 auto;position:relative;}
.grid-1410 .activity{width:1230px;height:232px;overflow:hidden;margin:0 auto;position:relative;}

.grid-960 .activity ul{height:152px;overflow:hidden;}
.grid-1180 .activity ul{height:192px;overflow:hidden;}
.grid-1410 .activity ul{height:232px;overflow:hidden;}

.activity li img{display:block;width:100%;height:100%;}
.activity li{display:block;float:left;}

.grid-960 .activity li{width:250px;height:125px;overflow:hidden;margin:12px;}
.grid-1180 .activity li{width:300px;height:150px;overflow:hidden;margin:20px;}
.grid-1410 .activity li{width:360px;height:180px;overflow:hidden;margin:25px;}
/*js切换*/
.pg_left,.pg_right {position: absolute;z-index: 999;width: 35px;height: 50px;overflow: hidden;}
.pg_right {background: transparent url(../images/pg_right.png) no-repeat scroll 5px 7px;}
.pg_right:hover {background: transparent url(../images/hover.png) no-repeat scroll 0 0;}
.grid-960 .pg_right{top:75px;right:16px;margin-top:-25px;}
.grid-1180 .pg_right{top:95px;right:20px;margin-top:-25px;}
.grid-1410 .pg_right{top:115px;right:25px;margin-top:-25px;}

.pg_left {background: transparent url(../images/pg_left.png) no-repeat scroll 5px 7px;}
.pg_left:hover {background: transparent url(../images/hover.png) no-repeat scroll right 0;}
.grid-960 .pg_left{top:75px;left:13px;margin-top:-25px;}
.grid-1180 .pg_left{top:95px;left:20px;margin-top:-25px;}
.grid-1410 .pg_left{top:115px;left:25px;margin-top:-25px;}

以上就是本文的全部内容，希望对大家的学习有所帮助。

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