闲暇之余，制作一用表格实现的简单的网站导航条，分享给大家。
调用很简单，只要将数据组织成json格式即可：格式如下：
window.onload = function()
{
var tf="if1";
var data=[{m:"体育网站",s:[{sn:"百度体育",st:"?cmd=1&class=sportnews"},
{sn:"搜狐体育",st:""},
{sn:"新浪体育",st:""}]},
{m:"新闻网站",s:[{sn:"百度",st:""},
{sn:"搜狐",st:""},
{sn:"新浪",st:""}]},
{m:"视频网站",s:[{sn:"百度视频",st:""},
{sn:"搜狐视频",st:""},
{sn:"新浪视频",st:""}]}
];
var nav=new tableNav("table1",data,tf);
var bautoClose=false; //打开当前导航条时其它导航条是否关闭
nav.generateNav(bautoClose);
}
原理很简单,简单解释如下,我们来看一个有6行1列的表格。
<table>
<tr><td>体育网站</td></tr>
<tr><td><a>aaa</a><br/><a>bbb</a><br/></td></tr>
<tr><td>新闻网站</td></tr>
<tr><td></td></tr>
<tr><td>视频网站</td></tr>
<tr><td></td></tr>
</table>
初始化时，将第1，3，5，。。。行显示，第2，4，6，。。行隐藏，然后在奇数行的点击事件中隐藏或显示其后一个偶数行，适当加一些样式及可。
整个实例代码如下：供初学者学习！
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="" >
<head>
<title>simple struct</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
#divtitle{
border:solid 1px #000000;
width:98%;
height:100px;
text-align:center;
}
#div1{
border:solid 1px #000000;
width:18%;
height:700px;
float:left;
}
#div2{
width:80%;
height:700px;
float:left;
}
<!--偶数行,0,2,4...-->
.oddrow{
margin-top:1px;
}
.oddrow td{
text-decoration:underline;
background-color:#666666;
color:#ccc;
cursor:pointer;
}
<!--奇数行-->
.evenrow{
display:none;
}
.evenrow a{
margin-left:10px;
margin-top:2px;
}
.evenrow td{
background-color:#eee;
display:block;
}
</style>
<script type="text/javascript">
window.onload = function()
{
var tf="if1";
var data=[{m:"体育网站",s:[{sn:"百度体育",st:"?cmd=1&class=sportnews"},
{sn:"搜狐体育",st:""},
{sn:"新浪体育",st:""}]},
{m:"新闻网站",s:[{sn:"百度",st:""},
{sn:"搜狐",st:""},
{sn:"新浪",st:""}]},
{m:"视频网站",s:[{sn:"百度视频",st:""},
{sn:"搜狐视频",st:""},
{sn:"新浪视频",st:""}]}
];
var nav=new tableNav("table1",data,tf);
var bautoClose=false; //打开当前导航条时其它导航条是否关闭
nav.generateNav(bautoClose);
}
function tableNav(tblid,data,ifname)
{
var tbl= document.getElementById(tblid);
//1.删除表格中存在的行
for (var t = 0; t < tbl.rows.length;t++){tbl.deleteRow(t);}
//2.添加数据
var idx=0;
for(var t=0;t<data.length;t++)
{
var row=tbl.insertRow(idx);
var cell=row.insertCell(0);
cell.innerHTML=data[t].m;
row.className="oddrow";
idx++;
var row=tbl.insertRow(idx);
row.className="evenrow";
var cell=row.insertCell(0);
for (var i=0;i<data[t].s.length;i++)
{
cell.innerHTML += "<a href='" +data[t].s[i].st+"' target='"+ ifname +"'>"+ data[t].s[i].sn +"</a><br />";
}
row.style.display="none";
idx++;
}
this.generateNav=function(bautoClose){
for (var i = 0; i < tbl.rows.length; i++)
if (i % 2==0)
{
var obj = tbl.rows[i].getElementsByTagName("td")[0];
obj.onclick = function()
{
var o = this.parentNode.nextSibling;
if (o.nodeType != 1)
{
o = o.nextSibling;
}
o.style.display = (o.style.display == "block") ? "none" : "block"
if (bautoClose)
{
for (var j = 1; j < tbl.rows.length; j =j+ 2)
{
if (tbl.rows[j] !=o)
{
tbl.rows[j].style.display = "none";
}
}
}
}
}
};
}
</script>
</head>
<body >
<div id="divtitle">
<h1>用表格实现简单网站左侧导航</h1>
</div>
<div id="div1">
<table id="table1">
</table>
</div>
<div id="div2">
<iframe id='if1' name='if1' src="" width="100%" height="100%" border=”0″ marginwidth=”0″ marginheight=”0″ allowtransparency=”yes"></iframe>
</div>
</body>
</html>
