带渐变淡入淡出并向右依次展开的多级菜单代码 - 代码效果

又一款核心基于jquery的多级导航菜单特效，横向向右依次展开菜单项，当然本菜单并不是完美的，因此没有怎么美化，另外包括子菜单的上级菜单中缺少一个菜单标记，这样用户有时候不知道哪个菜单中含有下级子菜单。不过添加这样一个标记似乎挺简单，你可以自己动手添加吧。

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>jquery多级下拉侧导航amazonmenu</title>
<style>
.amazonmenu ul {
font: normal 12px Verdana;
list-style: none;
margin: 0;
padding: 0;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}
.amazonmenu ul li {
position: static; 
}
.amazonmenu > ul {
background: white;
border: 1px solid gray;
border-radius: 5px;
width: 200px;
height: 400px;
position: relative;
}
.amazonmenu > ul li a {
color: black;
display: block;
overflow: auto;
padding: 10px 0;
position: relative;
text-decoration: none;
text-indent: 10px;
}
.amazonmenu > ul li.hassub > a::after {
 border: 5px solid transparent;
 border-left-color: gray;
 content: '';
 height: 0;
 position: absolute;
 right: 5px;
 top: 35%;
 width: 0;
}
.amazonmenu > ul li.hassub.selected > a::after {
 border-left-color: red;
}
.amazonmenu ul li a:hover, .amazonmenu ul li.hassub.selected > a {
background: lightblue;
color: navy;
}
.amazonmenu ul li > div, .amazonmenu ul li > ul {
background: white;
border: 1px solid gray;
border-radius: 0 8px 8px 0;
box-shadow: 2px 2px 2px gray;
display: none;
font-weight: normal;
width: 300px;
height: 400px;
left: 100%;
padding: 10px;
position: absolute;
top: 0;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
z-index: 1000;
}
/* CSS Media queries */
@media screen and (max-width: 480px) {
 .amazonmenu ul li > div, .amazonmenu ul li > ul {
 left: 30px;
}
.amazonmenu > ul li.hassub.selected::after {
 background: #eee;
 content: '';
 height: 100%;
 left: 0;
 opacity: .8;
 pointer-events: none;
 position: absolute;
 top: 0;
 width: 100%;
 z-index: 1;
}
}
</style>
<script src="daima/css3yuanzhu/jquery-1.9.1.min.js"></script>
<script>
document.createElement("nav") // for IE
var amazonmenu = {
	defaults: {
		animateduration: 100,
		showhidedelay: [100, 100],
		hidemenuonclick: true
	},
	setting: {},
	menuzindex: 1000,
	touchenabled: !!('ontouchstart' in window) || !!('ontouchstart' in document.documentElement) || !!window.ontouchstart || !!window.Touch || !!window.onmsgesturechange || (window.DocumentTouch && window.document instanceof window.DocumentTouch),
	showhide:function($li, action, setting){
		clearTimeout( $li.data('showhidetimer') )
		if (action == 'show'){
			$li.data().showhidetimer = setTimeout(function(){
				$li.addClass('selected')
				$li.data('$submenu')
					.data('fullyvisible', false)
					.css({zIndex: amazonmenu.menuzindex++})
					.fadeIn(setting.animateduration, function(){
						$(this).data('fullyvisible', true)
					})
				}, this.setting.showhidedelay[0])
		}
		else{
			$li.data().showhidetimer = setTimeout(function(){
				$li.removeClass('selected')
				$li.data('$submenu').stop(true, true).fadeOut(setting.animateduration)
				var $subuls = $li.data('$submenu').find('.issub').css({display: 'none'})
				if ($subuls.length > 0){
					$subuls.data('$parentli').removeClass('selected')
				}
			}, this.setting.showhidedelay[1])
		}
	},
	setupmenu:function($menu, setting){
		var $topul = $menu.children('ul:eq(0)')
		function addevtstring(cond, evtstr){
			return (cond)? ' ' + evtstr : ''
		}
		$topul.find('li>div, li>ul').each(function(){ // find drop down elements
			var $parentli = $(this).parent('li')
			var $dropdown = $(this)
			$parentli
				.addClass('hassub')
				.data({$submenu: $dropdown, showhidetimer: null})
				.on('mouseenter click', function(e){
					amazonmenu.showhide($(this), 'show', setting)
				})
				.on('click', function(e){
					e.stopPropagation()
				})
				.children('a').on('click', function(e){
					e.preventDefault() // prevent menu anchor links from firing
				})
			$dropdown
				.addClass('issub')
				.data({$parentli: $parentli})
				.on('mouseleave' + addevtstring(setting.hidemenuonclick || amazonmenu.touchenabled, 'click'), function(e){
					if ($(this).data('fullyvisible') == true){
						amazonmenu.showhide($(this).data('$parentli'), 'hide', setting)
					}
					if (e.type == 'click'){
						e.stopPropagation()
					}
				})
		}) // end find
		$topul.on('click', function(e){
			if ($(this).data('fullyvisible') == true){
				amazonmenu.showhide($(this).children('li.hassub.selected'), 'hide', setting)
			}
		})
		var $mainlis = $topul.children('li.hassub').on('mouseleave', function(){
			amazonmenu.showhide($(this), 'hide', setting)		
		})
	},
	init:function(options){
		var $menu = $('#' + options.menuid)
		this.setting = $.extend({}, options, this.defaults)
		this.setting.animateduration = Math.max(50, this.setting.animateduration)
		this.setupmenu($menu, this.setting)
	}
}
</script>
<script>
jQuery(function(){
	amazonmenu.init({
		menuid: 'mysidebarmenu'
	})
})
</script>
</head>
<body>
<nav id="mysidebarmenu" class="amazonmenu">
	<ul>
	<li><a href="/">Item 1</a></li>
	<li><a href="/">Folder 0</a>
		<div>
			<p>Browse our spring collection of useful webmaster tools and resources! </p>
		  <ul>
		  <li><a href="#">JavaScript</a></li>
		  <li><a href="#">CSS类</a></li>
		  <li><a href="#">CSS库</a>
		  <li><a href="#">网站工具</a>
			<div>
			<p><h3><a href="/">Image Optimizer</a></h3>Use this tool to easily optimize regular gifs, animated gifs. </p>
			<p><h3><a href="/">我的收藏夹</a></h3>Generate a favicon using any regular image with this tool. </p>
			<p><h3><a href="/">动画GIF</a></h3>Animated Gif Generator lets you easily create an animated gif。</p>
			</div>
		  <li><a href="/">PHP程序设计</a></li>
		  </ul>
		</div>
	</li>
	<li><a href="http://www.codefans.net">Folder 1</a>
	  <ul>
	  <li><a href="/">Sub Item 1.1</a></li>
	  <li><a href="/">Sub Item 1.2</a></li>
	  <li><a href="/">Sub Item 1.3</a>
			<ul>
				<li>Sub Item 1.3.1</li>
				<li>Sub Item 1.3.2</li>
				<li>Sub Item 1.3.3</li>
			</ul>
		</li>
	  <li><a href="/">Sub Item 1.4</a></li>
	  <li><a href="/">Sub Item 1.2</a></li>
	  <li><a href="/">Sub Item 1.3</a></li>
	  <li><a href="/">Sub Item 1.4</a></li>
	  </ul>
	</li>
	<li><a href="/">Item 3</a></li>
	<li><a href="/">Folder 2</a>
	  <ul>
	  <li><a href="/">Sub Item 2.1</a></li>
	  <li><a href="/">Sub Item 2.1</a></li>
	  <li><a href="/">Sub Item 2.1</a></li>
	  <li><a href="/">Sub Item 2.1</a></li>
	  <li><a href="/">Sub Item 2.1</a></li>
	  <li><a href="/">Sub Item 2.1</a></li>
	  </ul>
	</li>
	<li><a href="/">Item 4</a></li>
	</ul>
</nav>
</body>
</html>

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