menu.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<html>
<link rel="stylesheet" type="text/css" href="<%=basePath%>css/menu.css">
<head>
<title>树形菜单</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body class="panel" topmargin="0" leftmargin="0">
<div id="body" style="width: 200px"><!-- OA树开始-->
<ul id="menu">
<li class="L1"><a href="javascript:c(m01);" id="m01"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" /> 客户关系管理系统</span> </a></li>
<ul id="m01d" style="display: none;" class="U1">
<li class="L21"><a href="javascript:c(f01);" id="f01"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" /> 文件管理</span> </a></li>
<ul id="f01d" style="display: none;">
<li class="L3"><a href="fileList.action" target="mainRight"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />文件列表</span> </a></li>
<li class="L3"><a href="toUploadJsp.action" target="mainRight"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />文件上传</span> </a></li>
</ul>
<li class="L21"><a href="javascript:c(f02);" id="f02"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />111111</span> </a></li>
<ul id="f02d" style="display: none;">
<li class="L3"><a href="" target="mainRight"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />000001</span> </a></li>
<li class="L3"><a href="" target="mainRight"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />000002</span> </a></li>
<li class="L3"><a href="" target="mainRight"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />000003</span> </a></li>
<li class="L3"><a href="" target="mainRight"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />000004</span> </a></li>
<li class="L3"><a href="" target="mainRight"><span><img
src="<%=basePath%>images/ico/2.gif" align="absMiddle" />000005</span> </a></li>
</ul>
</ul>
</ul>
</div>
<div id="bottom"></div>
<script type="text/javascript" src="<%=basePath%>js/menu.js"></script>
</body>
</html>
menu.js:
var cur_id = "";
var flag = 0, sflag = 0;
//-------- 菜单点击事件 -------
function c(srcelement) {
var targetid, srcelement, targetelement;
var strbuf;
//-------- 如果点击了展开或收缩按钮---------
targetid = srcelement.id + "d";
targetelement = document.getElementById(targetid);
if (targetelement.style.display == "none") {
srcelement.className = "active";
targetelement.style.display = '';
menu_flag = 0;
} else {
srcelement.className = "";
targetelement.style.display = "none";
menu_flag = 1;
var links = document.getElementsByTagName("A");
for (i = 0; i < links.length; i++) {

这篇博客展示了如何使用HTML、CSS和JavaScript创建一个交互式的树形菜单。HTML部分包括`<ul>`和`<li>`元素来构建菜单结构,JavaScript处理菜单的展开和收缩事件,而CSS用于样式设计,如背景颜色、边框和链接样式。这个菜单适用于网页应用的导航,允许用户方便地访问不同层级的子菜单项。
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