JS+CSS简单树形菜单实现方法

本文实例讲述了JS+CSS简单树形菜单实现方法。分享给大家供大家参考。具体如下：

这是一款不错的CSS树形菜单，树状列表，当然不全是CSS实现，部分功能还使用了JavaScript代码进行配合，删减了修饰用的菜单图片，大家用的时候自己图片加进去，IMG标签大部分都预留了出来，稍懂Html语法的朋友很容易就看懂的。

运行效果截图如下：

在线演示地址如下：

http://demo.jb51.net/js/2015/js-css-simple-tree-menu-style-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>树状列表</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
<style>
*{margin:0px;padding:0px;}
A:link{color: #000000; TEXT-DECORATION: none;}
A:visited {COLOR: #000000; TEXT-DECORATION: none}
A:active {COLOR: #3333ff; TEXT-DECORATION: none}
A:hover {COLOR: #ff0000; TEXT-DECORATION: none}
.panel{ BACKGROUND: #DDE4EA; COLOR:#654125;}
ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
img{
  border:0px;
  width:16px;
  height:16px;
}
#menu{
  margin-top: 0px;
}
.U1 {
  background: #FFFFFF;
  border-bottom:1px #9D9D9D solid;
}
.L1 a:link, .L1 a:visited{
  color: #476074;
  background: url("");
  font-size:9pt;
  display: block;
  text-decoration: none;
  height: 24px;
}
.L1 a:link span, .L1 a:visited span{
 background: url("") no-repeat left;
 padding-left: 15px;
 height:24px;
 vertical-align:middle;
 padding:7px 0px 0px 16px;
 cursor:pointer;
 width:100%;
}
.L1 a:hover{
  color: #000000;
  font-weight:bold;
  background: url("");
  background-position: 0 -24px;
}
/* 一级菜单 active 效果 */
.L1 a:link.active, .L1 a:hover.active, .L1 a:active.active, .L1 a:visited.active{
  background: url("");
  background-position: 0 -24px;
}
.L1 a:link.active span, .L1 a:hover.active span, .L1 a:active.active span, .L1 a:visited.active span{
  color: #000000;
  font-weight:bold;
  background: url("") no-repeat left;
}
.L21 a:link, .L21 a:visited, .L22 a:link, .L22 a:visited, .L3 a:link, .L3 a:visited{
  color: #444659;
  background: none;
  height: 24px;
  font-size:9pt;
  display: block;
  text-decoration: none;
  padding-left: 13px;
  background: none;
}
.L21 a:link span, .L21 a:visited span, .L22 a:link span, .L22 a:visited span, .L3 a:link span, .L3 a:visited span{
 vertical-align:middle;
 padding:7px 0px 0px 16px;
 background: url("") no-repeat left center;
 cursor:pointer;
 width:100%;
}
.L22 a:link span, .L22 a:visited span, .L3 a:link span, .L3 a:visited span{
 background:none;
}
.L21 a:hover, .L22 a:hover, .L3 a:hover{
  background: url("") no-repeat top left;
  font-weight:bold;
}
.L3 a:link span, .L3 a:visited span{
  padding:7px 0px 0px 26px;
}
.L4 a:link span, .L4 a:visited span{
  padding:7px 0px 0px 36px;
}
/* 二级菜单 active 效果 */
.L21 a:link.active, .L21 a:hover.active, .L21 a:active.active, .L21 a:visited.active{
  background: none;
}
.L21 a:link.active span, .L21 a:hover.active span, .L21 a:active.active span, .L21 a:visited.active span{
  color: #000000;
  font-weight:bold;
  background: url("") no-repeat left center;
}
/* 二、三级菜单 active */
.L22 a:link.active, .L22 a:hover.active, .L22 a:active.active, .L22 a:visited.active,
.L3 a:link.active, .L3 a:hover.active, .L3 a:active.active, .L3 a:visited.active{
  background: url("") no-repeat left;
  background-position: 0 -24px;
}
.L22 a:link.active span, .L22 a:hover.active span, .L22 a:active.active span, .L22 a:visited.active span,
.L3 a:link.active span, .L3 a:hover.active span, .L3 a:active.active span, .L3 a:visited.active span{
  color: #FFFFFF;
  font-weight:bold;
  background: none;
}
.Ls{
  text-align:right;
  padding-top:4px;
  height:20px;
  font-size:9pt;
}
.setting:link, .setting:visited{
  text-decoration: underline;
  display:block;
}
</style>
</head>
<body class="panel" onLoad="init();">
<div id="sub_tabs" class="sub_tabs"></div>
 <div id="body">
 <!-- OA树开始-->
<ul id="menu">
<!--路政报表菜单 -->
<li class="L1"><a href="javascript:c('m01');" id="m01"><span><img src="" align="absMiddle"/> 路政报表</span></a></li>
<ul id="m01d" style="display:none;" class="U1">
<li class="L21"><a href="javascript:c('f40');" id="f40"><span><img src="" align="absMiddle"/> 路政报表1</span></a></li>
 <ul id="f40d" style="display:none;">
 <li class="L3"><a href="javascript:c('f42');"><span><img src= align="absMiddle"/> 报表内容</span></a></li>
  <ul id="f42d" style="display:none;"><li class="L4" ><a href="#"><span><img src= align="absMiddle"/>子报表内容</span></a></li></ul>
 <li class="L3"><a href="#"><span><img src="" align="absMiddle"/> 报表内容</span></a></li>
 </ul>
<li class="L21"><a href="javascript:c('f41');" id="f41"><span><img src="" align="absMiddle"/> 路政报表2</span></a></li>
 <ul id="f41d" style="display:none;">
 <li class="L3"><a href="#"><span><img src="" align="absMiddle"/>报表内容</span></a></li>
 <li class="L3"><a href="#"><span><img src="" align="absMiddle"/>报表内容</span></a></li>
 </ul>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
</ul>
<!--路政报表菜单 结束 -->
<!--路政报表菜单 -->
<li class="L1"><a href="javascript:c('m03');" id="m03"><span><img src="" align="absMiddle"/> 路政报表</span></a></li>
<ul id="m03d" style="display:none;" class="U1">
<li class="L21"><a href="javascript:c('f42');" id="f42"><span><img src= align="absMiddle"/> 路政报表1</span></a></li>
 <ul id="f42d" style="display:none;">
 <li class="L3"><a href="#"><span><img src="" align="absMiddle"/> 报表内容</span></a></li>
 <li class="L3"><a href="#"><span><img src="" align="absMiddle"/> 报表内容</span></a></li>
 </ul>
<li class="L21"><a href="javascript:c('f43');" id="f43"><span><img src= align="absMiddle"/> 路政报表2</span></a></li>
 <ul id="f43d" style="display:none;">
 <li class="L3"><a href="#"><span><img src= align="absMiddle"/>报表内容</span></a></li>
 <li class="L3"><a href="#"><span><img src= align="absMiddle"/>报表内容</span></a></li>
 </ul>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
<li class="L22"><a href="#"><span><img src="" /> 报表内容</span></a></li>
</ul>
<!--路政报表菜单 结束 -->
</ul>
</ul>
</div>
<script language="JavaScript">
window.onresize=function()
{
  if(!parent.$('frame1')) return;
  var rows = parent.$('frame1').rows.split(",");
  if(rows.length < 2 || rows[1]!="*") return;
  $("bottom_center").style.width = "0px";
  if(document.body.clientHeight > $("sub_tabs").clientHeight+$("bottom").clientHeight)
   $("body").style.height=(document.body.clientHeight-$("sub_tabs").clientHeight-$("bottom").clientHeight)+"px";
  var widthTotal = parseInt($("bottom").clientWidth);
  var widthLeft = parseInt($("bottom_left").clientWidth);
  var widthRight = parseInt($("bottom_right").clientWidth);
  if(!isNaN(widthTotal) && !isNaN(widthLeft) && !isNaN(widthRight))
  {
   $("bottom_center").style.width = widthTotal - widthLeft - widthRight + "px";
  }
};
function init()
{
  window.onresize();
}
var sub_menu="1";
function view_menu(id)
{
  set_current("");
  if($("menu").innerHTML.toLowerCase().indexOf("<li") >= 0)
   $("menu_code_"+sub_menu).innerText=$("menu").innerHTML;
  if($("menu_code_"+id).innerText=="" || isUndefined($("menu_code_"+id).innerText))
  {
   $("menu").innerHTML="<img src='/images/loading.gif' align='absMiddle'> 加载中，请稍候……";
   if(id==2) args="MENU_TYPE=SHORTCUT&OA_SUB_WINDOW=0&MENU_DISPLAY=";
   else if(id==3) args="MENU_TYPE=OA&OA_SUB_WINDOW=0";
   else if(id==4) args="MENU_TYPE=FAV&OA_SUB_WINDOW=0";
   else if(id==5) args="MENU_TYPE=FIS&OA_SUB_WINDOW=0";
   else args="OA_SUB_WINDOW=0";
   _get("menu_code.php", args, update_menu, true);
  }
  else
  {
   $("menu").innerHTML=$("menu_code_"+id).innerText;
  }
  if($('link_'+sub_menu))
   $('link_'+sub_menu).className="";
  $('link_'+id).className="active";
  sub_menu=id;
  setCookie("MENU_UI_1", id);
  if(id == 5)
  {
   openURL("http://www.jb51.net/");
  }
}
function update_menu(req)
{
  if(req.status == 200)
  {
   if(req.responseText=="")
     $("menu").innerHTML="<div style='padding:10px;'>无可访问菜单</div>";
   else
   {
     $("menu").innerHTML=req.responseText;
     if(sub_menu == 2) c('mMENU_SHORTCUT');
   }
  }
  else
  {
   $("menu").innerHTML="<div style='padding:10px;'>错误："+req.status+"</div>";
  }
}
var cur_id="",cur_expand="";
var flag=0,sflag=0;
//-------- 菜单点击事件 -------
function c(id)
{
 var targetid,targetelement;
 var strbuf;
 var el=$(id);
 if(!el)
   return;
 //-------- 如果点击了展开或收缩按钮---------
 targetid=el.id+"d";
 targetelement=$(targetid);
 var expandUL=$(cur_expand+"d");
 var expandLink=$(cur_expand);
 if (targetelement.style.display=="none")
 {
   if(expandUL && expandLink && el.id.substr(0,1)=="m")
   {
    expandLink.className="";
    expandUL.style.display='none';
   }
   if(el.id.substr(0,1)=="m")
    cur_expand=el.id;
   el.className="active";
   targetelement.style.display='';
   menu_flag=0;
   //$("expand_link").src="images/green_minus.gif";
 }
 else
 {
   el.className="";
   targetelement.style.display="none";
   menu_flag=1;
   //$("expand_link").src="images/green_plus.gif";
   var links=document.getElementsByTagName("A");
   for (i=0; i<links.length; i++)
   {
    el=links[i];
    if(el.parentNode.className.toUpperCase()=="L1" && el.className=="active" && el.id.substr(0,1)=="m")
    {
     menu_flag=0;
     // $("expand_link").src="images/green_minus.gif";
     break;
    }
   }
 }
}
//-------- 打开网址 -------
var $ = function(id) {return document.getElementById(id);};
var userAgent = navigator.userAgent.toLowerCase();
var is_opera = userAgent.indexOf('opera') != -1 && opera.version();
var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera) && userAgent.substr(userAgent.indexOf('msie') + 5, 3);
function MouseOverBtn(){event.srcElement.className+="Hover";}
function MouseOutBtn() {event.srcElement.className=event.srcElement.className.substr(0,event.srcElement.className.indexOf("Hover"));}
function CorrectButton()
{
  var inputs=document.getElementsByTagName("INPUT");
  for(var i=0; i<inputs.length; i++)
  {
   var el = inputs[i];
   var elType = el.type.toLowerCase();
   var elClass = el.className.toLowerCase();
   var elLength = Math.ceil(el.value.replace(/[^\x00-\xff]/g,"**").length/2);
   if(elType!="button" && elType!="submit" && elType!="reset" || elClass!="bigbutton"&&elClass!="smallbutton")
     continue;
   if(elLength<=3)
     el.className+="A";
   else if(elLength==4)
     el.className+="B";
   else if(elLength>=5 && elLength<=7)
     el.className+="C";
   else if(elLength>=8 && elLength<=11)
     el.className+="D";
   else
     el.className+="E";
   if(is_ie)
   {
     el.attachEvent("onmouseover", MouseOverBtn);
     el.attachEvent("onmouseout", MouseOutBtn);
   }
  }
}
if(is_ie)
  window.attachEvent("onload", CorrectButton);
else
  window.addEventListener("load", CorrectButton,false);
</script>
 </body>
</html>

希望本文所述对大家的JavaScript程序设计有所帮助。