js+css实现的简易弹出式菜单(第二版模仿ibm开发中心的菜单)

于 2008-11-03 23:45:26 发布
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分类专栏： javascript 文章标签： IBM CSS IE HTML XHTML
本文介绍了一个复杂的多级菜单设计案例，使用HTML、CSS和JavaScript实现，并兼容IE6和Firefox3等浏览器。通过详细的代码注释，展示了如何创建响应鼠标悬停事件的下拉菜单，并动态调整菜单项的位置。

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下面是html代码，包括了css和js及测试的html标签,在ie6和ff3下测试通过，附详细注释以及源文件下载

<!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> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
  <style type="text/css">
	body {
		font-size: 14px;
	}

	.hrtc_popupmenu,.hrtc_popupmenu ul {
		margin: 0;
		padding: 0;
		list-style: none;/*取消列表样式*/
	}
	
	/*顶层链接样式*/
	.hrtc_popupmenu a{
		display: block;/*使a链接可以撑满父标签，这样空白处也会响应事件*/
		/*word-break:break-all; 文本过长自动换行*/
		text-decoration: none;
		color: #293D6B;
		background: #C3D3E0;
		text-align:center;
		width: 120px;/*顶层链接宽度*/
		font-weight: bold;
	}

	/*下层链接样式*/
	.hrtc_popupmenu ul li a{
		display: block;/*使a链接可以撑满父标签，这样空白处也会响应事件*/
		/*border:1px solid black;*/
		/*word-break:break-all; 文本过长自动换行*/
		text-decoration: none;
		text-align:left;
		width: 190px;/*下层链接宽度*/
		padding-left: 10px;
	}

	.hrtc_popupmenu a:hover{
		background-color: #98B1C4;
	}

	.hrtc_popupmenu li {
		float:left;/*设为浮动使得第一层菜单可以水平展开*/
		margin: 0;
		padding: 0;
		line-height: 20px;/*为了计算方便不设置padding属性，因此设置了该属性来控制间距*/
		position: relative;
		z-index: 1;
	}

	.hrtc_popupmenu li ul {
		display:none;/*隐藏子菜单*/
		position: absolute;/*设为绝对位置，不会影响父元素布局*/
		z-index: 100;/*最大允许zindex*/
		border:1px solid #98B1C4;
	}

	.hrtc_popupmenu li ul li {
		clear: left;/*下级菜单换行*/
	}
	
	.hrtc_popupmenu li ul li ul{
		top:0px;/*弹出式菜单偏移量*/
	}

  </style>
  <SCRIPT LANGUAGE="JavaScript">
  <!--
	/* 该例子只是为了演示，直接创建了对象*/
	var hrtc_popupmenu = {
		/**
			返回父节点下和某个路径匹配的元素集合
			@pNode 父节点
			@path 例如li>a 和 xpath类似
		*/
		selectNodes:function(pNode,path){
			var nodesRes = [pNode];
			var strs = path.toUpperCase().split(">");

			for(var i = 0;i < strs.length;i++){
				var nodesResT = [];
				for(j = 0;j < nodesRes.length;j++){
					nodesResT = nodesResT.concat(this.searchNodes(nodesRes[j],strs[i]));
				}
				nodesRes = nodesResT;
				if(nodesRes.length == 0){
					break;
				}
			}
			return nodesRes;
		}
		,
		/**
			搜索父节点下和某个标签匹配的元素集合
			@pNode 父节点
			@tagName 标签名
		*/
		searchNodes:function(pNode,tagName){
			var nodesRes = [];
			var nodes = pNode.childNodes;
			for(var i = 0;i < nodes.length;i++){
				if(nodes[i].nodeType == "1"){
					if(tagName == "*" || nodes[i].tagName == tagName){
						nodesRes.push(nodes[i]);
					}
				}
			}
			return nodesRes;
		}
		,
		/**
			返回父节点下第一个和某个路径匹配的元素
			@pNode 父节点
			@path 例如li>a 和 xpath类似
		*/
		selectNode:function(pNode,path){
			var strs = path.toUpperCase().split(">");
			var node = pNode;
			for(var i = 0;i < strs.length;i++){
				node = this.searchNode(node,strs[i]);
				if(!node){
					break;
				}
			}
			return node;

		}
		,
		/**
			搜索父节点下和第一个某个标签匹配的元素
			@pNode 父节点
			@tagName 标签名
		*/
		searchNode:function(pNode,tagName){
			var nodes = pNode.childNodes;
			for(var i = 0;i < nodes.length;i++){
				if(nodes[i].nodeType == "1"){
					if(nodes[i].tagName == tagName){
						return nodes[i];
					}
				}
			}

		}
		,
		doOnMouseOver:function(eleUL){
			eleUL.style.display = "block";
		}
		,
		doOnMouseOut:function(eleUL){
			eleUL.style.display = "none";
		}
		,
		/**
			绑定事件，为了兼容ie和ff
			@obj 要绑定事件的元素名
			@event 事件名
			@handler 处理事件
		*/
		bindEvent:function(obj,event,handler){
			if(document.all){
				obj.attachEvent("on"+event,handler);
			}else{
				obj.addEventListener(event,handler,false);
			}
		}
		,
		/**
			遍历菜单树
			@pNode 结点
			@left 样式，左边偏移位置
		*/
		traver:function(pNode,left){
			//绑定事件和属性
			if(pNode.nodeType == "1" && pNode.tagName == "UL"){
				var nodesUL = this.selectNodes(pNode,"li>ul");
				for(var i = 0;i < nodesUL.length;i++){
					var objLi = nodesUL[i].parentNode;
					//子节点设为absolute后，必须设置父节点为relative，这样子节点会相对于父节点计算坐标，计算方便，直接设置为+(向右展开)/-(向左展开)width
					//objLi.style.position = "relative";
					//这里用到了闭包,因为绑定的必须要是一个函数,并且需要把参数传进去
					this.bindEvent(objLi,"mouseover",function(obj,objUL){return function(){obj.doOnMouseOver(objUL);}}(this,nodesUL[i]));
					this.bindEvent(objLi,"mouseout",function(obj,objUL){return function(){obj.doOnMouseOut(objUL);}}(this,nodesUL[i]));

					var objA = this.selectNode(objLi,"a");
					
					nodesUL[i].style.left = left+"px";

					if(left > 0){
						objA.innerHTML = objA.innerHTML+" >";
					}else{
						objA.innerHTML = "< " + objA.innerHTML;
					}

									
				}
			}
			
			//遍历下层并设置宽度
			var nodes = pNode.childNodes;
			for(var i = 0;i < nodes.length;i++){
				if(nodes[i].nodeType == "1"){
					if(nodes[i].tagName == "UL" || nodes[i].tagName == "LI"){
						//每层菜单的首先出现的li的zIndex必须比后面的大否则会覆盖子层
						if(nodes[i].tagName == "LI"){
							nodes[i].style.zIndex = 100 - i ;
						}
						this.traver(nodes[i],left);
					}
				}
			}
		}
		,
		/**
		*@id 对象名
		*@offset 宽度
		*/
		bindMenu:function(id,offset){
			var menu;
			if(typeof id == "string"){
				menu = document.getElementById(id);
			} else {
				menu = id;
			}
			
			if(!menu || menu.nodeName != "UL"){
				alert("只能绑定UL元素");
				return;
			}

			//遍历第一次水平菜单
			var nodesUL = this.selectNodes(menu,"li>ul");
			for(var i = 0;i < nodesUL.length;i++){
				var objLi = nodesUL[i].parentNode;
				//这里无需设置relative因为是向下弹出菜单，下级菜单样式并非absolute
				//objLi.style.position = "relative";
				this.bindEvent(objLi,"mouseover",function(obj,objUL){return function(){obj.doOnMouseOver(objUL);}}(this,nodesUL[i]));
				this.bindEvent(objLi,"mouseout",function(obj,objUL){return function(){obj.doOnMouseOut(objUL);}}(this,nodesUL[i]));
			}
			
			var nodes = this.selectNodes(menu,"li");
			if (nodes.length > 0){
				//除了最优边的菜单都往右侧弹出，最右边的菜单往左侧弹出
				for(var i = 0;i < nodes.length - 1;i++){
					this.traver(nodes[i],offset);
				}
				
				this.traver(nodes[nodes.length - 1],-offset);
			}

		}
	
	}
	window.onload = function(){
		hrtc_popupmenu.bindMenu("hrtc_popupmenu",190);
	}
	
  //-->
  </SCRIPT>
 </HEAD>

 <BODY>
 <div style="float:left;">
  <ul id="hrtc_popupmenu" class="hrtc_popupmenu">
	<li><a href="#">菜单11</a></li>
	<li><a href="#">菜单12</a>
		<ul>
			<li><a href="#">菜单121</a></li>
			<li>
				<a href="#">菜单122</a>
				<ul>
					<li><a href="#">菜单1221</a></li>
					<li>
						<a href="#">菜单1222</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li><a href="#">菜单1222</a></li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单1223</a></li>
				</ul>
			</li>
			<li><a href="#">菜单123</a></li>
		</ul>
	</li>
	<li><a href="#">菜单13</a>
		<ul>
			<li><a href="#">菜单12111111111111111</a></li>
			<li>
				<a href="#">菜单122</a>
				<ul>
					<li><a href="#">菜单1221</a></li>
					<li>
						<a href="#">菜单1222</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li><a href="#">菜单1222</a></li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单1223</a></li>
				</ul>
			</li>
			<li><a href="#">菜单123</a>
				<ul>
					<li><a href="#">菜单121</a>
						<ul>
							<li><a href="#">菜单121</a></li>
							<li>
								<a href="#">菜单122</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li>
										<a href="#">菜单1222</a>
										<ul>
											<li><a href="#">菜单1221</a></li>
											<li><a href="#">菜单1222</a></li>
											<li><a href="#">菜单1223</a></li>
										</ul>
									</li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单123</a></li>
						</ul>
					</li>
					<li>
						<a href="#">菜单122</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li>
								<a href="#">菜单1222</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li><a href="#">菜单1222</a></li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单123</a></li>
				</ul>
			</li>
		</ul>
	</li>
	<li><a href="#">菜单13</a>
		<ul>
			<li><a href="#">菜单121</a></li>
			<li>
				<a href="#">菜单122</a>
				<ul>
					<li><a href="#">菜单1221</a></li>
					<li>
						<a href="#">菜单1222</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li><a href="#">菜单1222</a></li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单1223</a></li>
				</ul>
			</li>
			<li><a href="#">菜单123</a>
				<ul>
					<li><a href="#">菜单121</a>
						<ul>
							<li><a href="#">菜单121</a></li>
							<li>
								<a href="#">菜单122</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li>
										<a href="#">菜单1222</a>
										<ul>
											<li><a href="#">菜单1221</a></li>
											<li><a href="#">菜单1222</a></li>
											<li><a href="#">菜单1223</a></li>
										</ul>
									</li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单123</a></li>
						</ul>
					</li>
					<li>
						<a href="#">菜单122</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li>
								<a href="#">菜单1222</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li><a href="#">菜单1222</a></li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单123</a></li>
				</ul>
			</li>
		</ul>
	</li>
	<li><a href="#">菜单13</a>
		<ul>
			<li><a href="#">菜单121</a></li>
			<li>
				<a href="#">菜单122</a>
				<ul>
					<li><a href="#">菜单1221</a></li>
					<li>
						<a href="#">菜单1222</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li><a href="#">菜单1222</a></li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单1223</a></li>
				</ul>
			</li>
			<li><a href="#">菜单123</a>
				<ul>
					<li><a href="#">菜单121</a>
						<ul>
							<li><a href="#">菜单121</a></li>
							<li>
								<a href="#">菜单122</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li>
										<a href="#">菜单1222</a>
										<ul>
											<li><a href="#">菜单1221</a></li>
											<li><a href="#">菜单1222</a></li>
											<li><a href="#">菜单1223</a></li>
										</ul>
									</li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单123</a></li>
						</ul>
					</li>
					<li>
						<a href="#">菜单122</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li>
								<a href="#">菜单1222</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li><a href="#">菜单1222</a></li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单123</a></li>
				</ul>
			</li>
		</ul>
	</li>
	<li><a href="#">菜单14</a>
		<ul>
			<li><a href="#">菜单121</a></li>
			<li>
				<a href="#">菜单122</a>
				<ul>
					<li><a href="#">菜单1221</a></li>
					<li>
						<a href="#">菜单1222</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li><a href="#">菜单1222</a></li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单1223</a></li>
				</ul>
			</li>
			<li><a href="#">菜单123</a>
				<ul>
					<li><a href="#">菜单121</a>
						<ul>
							<li><a href="#">菜单121</a></li>
							<li>
								<a href="#">菜单122</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li>
										<a href="#">菜单1222</a>
										<ul>
											<li><a href="#">菜单1221</a></li>
											<li><a href="#">菜单1222</a></li>
											<li><a href="#">菜单1223</a></li>
										</ul>
									</li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单123</a></li>
						</ul>
					</li>
					<li>
						<a href="#">菜单122</a>
						<ul>
							<li><a href="#">菜单1221</a></li>
							<li>
								<a href="#">菜单1222</a>
								<ul>
									<li><a href="#">菜单1221</a></li>
									<li><a href="#">菜单1222</a></li>
									<li><a href="#">菜单1223</a></li>
								</ul>
							</li>
							<li><a href="#">菜单1223</a></li>
						</ul>
					</li>
					<li><a href="#">菜单123</a></li>
				</ul>
			</li>
		</ul>
	</li>
  </ul>
</div>
 </BODY>
</HTML>
 

 

 参考了下面纯css实现的三级菜单，下面的例子有一系列大概六篇文章，不过是偶然搜到的，现在完整的找不到了。谁知道能告诉我下。

 

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>三级dropdown弹出菜单</title>
<style type="text/css">
/* common styling */
.menu {font-family: arial, sans-serif; width:750px; position:relative; margin:0; font-size:11px; margin:50px 0;}
.menu ul li a, .menu ul li a:visited {display:block; text-decoration:none; color:#000;width:104px; height:20px; text-align:center; color:#fff; border:1px solid #fff; background:#710069; line-height:20px; font-size:11px; overflow:hidden;}
.menu ul {padding:0; margin:0;list-style-type: none; }
.menu ul li {float:left; margin-right:1px; position:relative;}
.menu ul li ul {display: none;}
/* specific to non IE browsers */
.menu ul li:hover a {color:#fff; background:#36f;}
.menu ul li:hover ul {display:block; position:absolute; top:21px; left:0; width:105px;}
.menu ul li:hover ul li a.hide {background:#6a3; color:#fff;}
.menu ul li:hover ul li:hover a.hide {background:#6fc; color:#000;}
.menu ul li:hover ul li ul {display: none;}
.menu ul li:hover ul li a {display:block; background:#ddd; color:#000;}
.menu ul li:hover ul li a:hover {background:#6fc; color:#000;}
.menu ul li:hover ul li:hover ul {display:block; position:absolute; left:105px; top:0;}
.menu ul li:hover ul li:hover ul.left {left:-105px;}
</style>
<!--[if lte IE 6]>
<style type="text/css">
.menu ul li a.hide, .menu ul li a:visited.hide {display:none;}
.menu ul li a:hover ul li a.hide {display:none;}
.menu ul li a:hover {color:#fff; background:#36f;}
.menu ul li a:hover ul {display:block; position:absolute; top:21px; left:0; width:105px;}
.menu ul li a:hover ul li a.sub {background:#6a3; color:#fff;}
.menu ul li a:hover ul li a {display:block; background:#ddd; color:#000;}
.menu ul li a:hover ul li a ul {visibility:hidden;}
.menu ul li a:hover ul li a:hover {background:#6fc; color:#000;}
.menu ul li a:hover ul li a:hover ul {visibility:visible; position:absolute; left:105px; top:0; color:#000;}
.menu ul li a:hover ul li a:hover ul.left {left:-105px;}
</style>
<![endif]-->
</head>
<body>
<div class="menu">
<ul>
<li><a class="hide" href="../menu/index.html">DEMOS</a>
<!--[if lte IE 6]>
<a href="../menu/index.html">DEMOS
<table><tr><td>
<![endif]-->
<ul>
<li><a href="../menu/zero_dollars.html" title="The zero dollar ads page">zero dollars</a></li>
<li><a href="../menu/embed.html" title="Wrapping text around images">wrapping text</a></li>
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<li><a href="../opacity/picturemenu.html" title="a menu using opacity">opaque menu</a></li>
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<li><a href="../opacity/png2.html" title="partial opacity II">partial opacity II</a></li>
<li><a class="hide" href="../menu/hover_click.html" title="Hover/click with no active/focus borders">&lt; HOVER/CLICK</a>
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