<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">


<head>


<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />


<title>jquery showMore 显示更多</title>


<script type="text/javascript" src="js/jquery-1.8.3.js"></script>


<script type="text/javascript" src="js/jquery.showMore.js"></script>


</head>


<body>


<ul class="showMoreNChildren" pagesize="5">


<li>a</li>


<li>b</li>


<li>c</li>


<li>d</li>


<li>e</li>


<li>f</li>


<li>g</li>


<li>h</li>


<li>i</li>


<li>j</li>


<li>k</li>


<li>m</li>


<li>a</li>


<li>b</li>


<li>c</li>


<li>d</li>


<li>e</li>


<li>f</li>


<li>g</li>


<li>h</li>


<li>i</li>


<li>j</li>


<li>k</li>


<li>m</li>


</ul>

 

<ul class="mynews" pagesize="4">


<li>news 11</li>


<li>news 12</li>


<li>news 13</li>


<li>news 14</li>


<li>news 21</li>


<li>news 22</li>


<li>news 23</li>


<li>news 24</li>


<li>news 31</li>


<li>news 32</li>


<li>news 33</li>


<li>news 34</li>


</ul>

 

<script type="text/javascript">


//调用显示更多插件。参数是标准的 jquery 选择符 


$.showMore(".showMoreNChildren,.mynews");


</script>


</body>


</html>

JavaScript code
 
(function () {

var showMoreNChildren = function ($children, n) {


//显示某jquery元素下的前n个隐藏的子元素


var $hiddenChildren = $children.filter(":hidden");


var cnt = $hiddenChildren.length;


for (var i = 0; i < n && i < cnt ; i++) {


$hiddenChildren.eq(i).show();


}


return cnt - n;//返回还剩余的隐藏子元素的数量


}

 

jQuery.showMore = function (selector) {


if (selector == undefined) { selector = ".showMoreNChildren" }


//对页中现有的class=showMorehandle的元素,在之后添加显示更多条,并绑定点击行为


$(selector).each(function () {


var pagesize = $(this).attr("pagesize") || 10;


var $children = $(this).children();


if ($children.length > pagesize) {


for (var i = pagesize; i < $children.length; i++) {


$children.eq(i).hide();


}

 

$("<div class='showMorehandle' >显示更多</div>").insertAfter($(this)).click(function () {


if (showMoreNChildren($children, pagesize) <= 0) {


//如果目标元素已经没有隐藏的子元素了,就隐藏“点击更多的按钮条”


$(this).hide();


};


});


}


});


}

})();