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jquery implements vertical navigation menu with shrinking function_jquery
jquery implements vertical navigation menu with shrinking function_jquery
本文介绍一种比较常见的导航菜单是如何实现的，它具有垂直结构，点击导航主标题可以展开或者折叠二级菜单。
代码实例如下:
<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<title>垂直导航菜单</title>
<style type="text/css">
body{
margin:0;
padding:0 0 12px 0;
font-size:12px;
line-height:22px;
font-family:"\5b8b\4f53", "Arial Narrow";
background:#fff;
}
form, ul, li, p, h1, h2, h3, h4, h5, h6{
margin:0;
padding:0;
}
input, select{
font-size:12px;
line-height:16px;
}
img{border:0;}
ul, li{list-style-type:none;}
a{
color:#00007F;
text-decoration:none;
}
a:hover{
color:#bd0a01;
text-decoration:underline;
}
.box{
width:150px;
margin:0 auto;
}
.menu{
overflow:hidden;
border-color:#C4D5DF;
border-style:solid;
border-width:0 1px 1px;
}
.menu li.level1 a{
display:block;
height:28px;
line-height:28px;
background:#EBF3F8;
font-weight:700;
color:#5893B7;
text-indent:14px;
border-top:1px solid #C4D5DF;
}
.menu li.level1 a:hover{
text-decoration:none;
}
.menu li.level1 a.current{
background:#B1D7EF;
}
.menu li ul{
overflow:hidden;
}
.menu li ul.level2{
display:none;
}
.menu li ul.level2 li a{
display:block;
height:28px;
line-height:28px;
background:#ffffff;
font-weight:400;
color:#42556B;
text-indent:18px;
border-top:0px solid #ffffff;
overflow:hidden;
}
.menu li ul.level2 li a:hover {
color:#f60;
}
</style>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".level1 > a").click(function(){
$(this).addClass("current")
.next().show()
.parent().siblings().children("a").removeClass("current")
.next().hide();
return false;
});
});
</script>
</head>
<body>
<div class="box">
<ul class="menu">
<li class="level1">
<a href="#none">前端专区</a>
<ul class="level2">
<li><a href="#none">html教程</a></li>
<li><a href="#none" >css教程</a></li>
<li><a href="#none" >div教程</a></li>
<li><a href="#none" >jquery教程</a></li>
</ul>
</li>
<li class="level1">
<a href="#none">资源专区</a>
<ul class="level2">
<li><a href="#none">特效下载</a></li>
<li><a href="#none">电脑特效</a></li>
<li><a href="#none">手机特效</a></li>
<li><a href="#none">图片下载</a></li>
</ul>
</li>
<li class="level1">
<a href="#none">蚂蚁部落</a>
<ul class="level2">
<li><a href="#none">前端专区</a></li>
<li><a href="#none">特效专区</a></li>
<li><a href="#none">站长交流</a></li>
<li><a href="#none">管理专区</a></li>
</ul>
</li>
</ul>
</div>
</body>
</html>
上面的代码实现了垂直导航菜单效果，下面介绍一下它的实现过程。
一.实现过程分解:
1.
.box{
width:150px;
margin:0 auto;
}
2.折叠菜单的结构布局:
<li class="level1"> <a href="#none">前端专区</a> <ul class="level2"> <li><a href="#none">html教程</a></li> <li><a href="#none" >css教程</a></li> <li><a href="#none" >div教程</a></li> <li><a href="#none" >jquery教程</a></li> </ul> </li>
上面的代码是折叠菜单的结构，作为主导航的链接a被使用display:block设置为块级元素，这样就可以设置它的尺寸，同时在默认状态下，作为二级菜单的ul元素是隐藏的，也就是说二级菜单是折叠的。
二.jquery代码注释:
1.$(document).ready(function(){})，当文档结构完全加载完毕再去执行函数中的代码。
2.$(".level1 > a").click(function(){})，为class属性值为level1元素下的一级a元素注册click事件处理函数，也就是为主导航链接注册事件处理函数。
3.$(this).addClass("current").next().show().parent().siblings().children("a").removeClass("current").next().hide()，这段代码是一个链式调用效果，实现了点击主导航链接实现当前点击主导航后面的二级菜单展开，其他菜单折叠效果。
4.return false，取消主导航链接的跳转效果。
以上就是本文的全部内容，希望对大家学习jquery程序设计有所帮助。
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