jquery implements vertical navigation menu with shrinking function

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jquery implements vertical navigation menu with shrinking function_jquery

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May 16, 2016 pm 03:15 PM

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.

最外层的box元素能够将整个导航栏实现了水平居中效果，css代码如下:

.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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