本文实例讲述了jquery实现带渐变淡入淡出并向右依次展开的多级菜单效果。分享给大家供大家参考。具体如下：
这是一款核心基于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。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/jquery-right-show-menu-codes/
具体代码如下：
<!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="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="#">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>
希望本文所述对大家的jquery程序设计有所帮助。
