本文实例讲述了jquery实现无限分级横向导航菜单的方法。分享给大家供大家参考。具体实现方法如下：
1. jquery插件版本代码如下：
$.fn.extend({
droplinemenu: function(configs) {
var configs = $.extend({
over: 200,
out: 100,
rightdown:'css/down.gif'
},configs||{});
this.find(">ul").addClass("dropmenu");
this.find("ul li:has(ul)").addClass('hasmenu').find(">a").append("<img class='downarrowclass' src='"+configs.rightdown+"'>");
var currentobj;
return $('li.hasmenu').hover(function(){
if ($.browser.msie) {//清除ie下生成的overflow:hidden
$(this).parent("ul").css({'overflow': 'visible'});
}
$(this).find(">ul").stop(true, true).css('top',$(this).height()).slideDown(configs.over);
},function(){
$(this).find(">ul").stop(true, true).slideUp(configs.out);
});
}
});
})(jQuery);
2. 样式代码
.droplinebar{
position: absolute;
z-index: 20;
width: 700px;
}
.droplinebar ul.dropmenu {
position: relative;
}
.droplinebar ul{
width: 100%;
float: left;
font: bold 13px Arial;
background: #242c54 url(bluedefault.gif) center center repeat-x; /*default background of menu bar*/
}
.droplinebar ul li{
float:left;
}
.droplinebar ul ul {
width: 700px;
display:none;
z-index: 100;
position:absolute;
left:0;
background: #303c76;
zoom: 1;
}
.droplinebar ul li a{
float: left;
color: white;
padding: 9px 11px;
text-decoration: none;
display:block;
}
.droplinebar ul li.hasmenu a img {border:none;margin-left:5px;}
.droplinebar ul li a:hover, .droplinebar ul li .current{ /*background of main menu bar links onMouseover*/
color: white;
background: transparent url(blueactive.gif) center center repeat-x;
}
/* Sub level menu links style */
.droplinebar ul li ul li a{
font: normal 13px Verdana;
padding: 6px;
padding-right: 8px;
margin: 0;
border-bottom: 1px solid navy;
}
.droplinebar ul li ul li a:hover{ /*sub menu links' background color onMouseover */
background: #242c54;
}
3. HTML代码如下
<script type="text/javascript" src="js/jquery.min.js"></script>
<script src="js/droplinemenu.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#mydroplinemenu").droplinemenu();
});
</script>
<div id="mydroplinemenu" class="droplinebar">
<ul>
<li><a href="http://www.dynamicdrive.com/">Home</a></li>
<li><a href="http://www.dynamicdrive.com/style/">CSS Examples</a>
<ul>
<li><a href="#">Activities 1</a></li>
<li><a href="#">Activities 2</a></li>
<li><a href="#">Activities 3</a>
<ul>
<li><a href="#">Water Sports 1</a></li>
<li><a href="#">Water Sports 1</a></li>
<li><a href="#">Water Sports 1</a></li>
<li><a href="#">Water Sports 1</a></li>
</ul>
</li>
<li><a href="#">Activities 4</a></li>
</ul>
</li>
<li><a href="http://tools.dynamicdrive.com">Tools</a></li>
<li><a href="http://www.javascriptkit.com/">JavaScript</a>
<ul>
<li><a href="#">Traveling 1</a></li>
<li><a href="#">Traveling 2</a></li>
<li><a href="#">Traveling 3</a></li>
<li><a href="#">Traveling 4</a>
<ul>
<li><a href="#">Africa 1</a></li>
<li><a href="#">Africa 2</a></li>
<li><a href="#">Africa 3</a></li>
<li><a href="#">Africa 4</a>
<ul>
<li><a href="#">Kenya 1</a></li>
<li><a href="#">Kenya 2</a></li>
<li><a href="#">Kenya 3</a></li>
<li><a href="#">Kenya 4</a></li>
<li><a href="#">Kenya 5</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">Traveling 5</a></li>
</ul>
</li>
<li><a href="http://www.cssdrive.com">Gallery</a></li>
</ul>
</div>
4. 无插件版本代码:
var configs_over = 200,configs_out = 100;
$("#mydroplinemenu").find(">ul").addClass("dropmenu").find("li:has(ul)").addClass('hasmenu').find(">a").append("<img class='downarrowclass' src='css/down.gif'>");
$('.dropmenu li.hasmenu').hover(function(){
if ($.browser.msie) {//清除ie下生成的overflow:hidden
$(this).parent("ul").css({'overflow': 'visible'});
}
$(this).find(">ul").stop(true, true).css('top',$(this).height()).slideDown(configs_over);
},function(){
$(this).find(">ul").stop(true, true).slideUp(configs_out);
});
});
希望本文所述对大家的jQuery程序设计有所帮助。