一个最简单的级联下拉菜单

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<html xmlns="http://www.w3.org/1999/xhtml" lang="gb2312"> 
<head> 
<head> 
<title> 代码实例:级联菜单 </title> 
<meta http-equiv="content-type" content="text/html; charset=gb2312" /> 
<meta name="author" content="枫岩,CNLei.y.l@gmail.com"> 
</head> 
<body> 
<select id="BigCate" name="BigCate" size="1" onchange="Redirect(this.options.selectedIndex)"> 
<option value="">人物</option> 
<option value="">地理</option> 
<option value="">野生动物</option> 
<option value="">科技</option> 
<option value="">静物</option> 
<option value="">设计</option> 
<option value="">新闻</option> 
<option value="">宠物</option> 
<option value="">植物</option> 
<option value="">娱乐</option> 
<option value="">生活亮点</option> 
<option value="">体育</option> 
</select> 
<select id="SmlCate" name="SmlCate" size="1"> 
<option value="1">日常生活</option> 
<option value="2">旅行</option> 
<option value="3">聚会</option> 
<option value="4">婚庆</option> 
<option value="5">节日</option> 
<option value="6">美女写真</option> 
<option value="7">人体摄影</option> 
<option value="8">网友自拍</option> 
<option value="9">演艺明星</option> 
<option value="10">体育明星</option> 
<option value="11">政坛名人</option> 
<option value="12">其它</option> 
</select> 
<script type="text/javascript"> 
<!-- 
var groups = document.getElementById("BigCate").options.length; 
var group = new Array(groups) 
for (i = 0; i < groups; i ++) 
group[i] = new Array()

group[0][0] = new Option("日常生活","1") 
group[0][1] = new Option("旅行","2") 
group[0][2] = new Option("聚会","3") 
group[0][3] = new Option("婚庆","4") 
group[0][4] = new Option("节日","5") 
group[0][5] = new Option("美女写真","6") 
group[0][6] = new Option("人体摄影","7") 
group[0][7] = new Option("网友自拍","8") 
group[0][8] = new Option("演艺明星","9") 
group[0][9] = new Option("体育明星","10") 
group[0][10] = new Option("政坛名人","11") 
group[0][11] = new Option("其它","12")

group[1][0] = new Option("现代建筑","40") 
group[1][1] = new Option("文化遗产","41") 
group[1][2] = new Option("自然风景","42") 
group[1][3] = new Option("其它","43")

group[2][0] = new Option("哺乳类","80") 
group[2][1] = new Option("鸟类","81") 
group[2][2] = new Option("鱼类","82") 
group[2][3] = new Option("昆虫","83") 
group[2][4] = new Option("其它","84")

group[3][0] = new Option("计算机","120") 
group[3][1] = new Option("军事","121") 
group[3][2] = new Option("太空","122") 
group[3][3] = new Option("其它","123")

group[4][0] = new Option("邮票","160") 
group[4][1] = new Option("钱币","161") 
group[4][2] = new Option("饰物","162") 
group[4][3] = new Option("玩具","163") 
group[4][4] = new Option("模型","164") 
group[4][5] = new Option("书法","165") 
group[4][6] = new Option("绘画","166") 
group[4][7] = new Option("篆刻","167") 
group[4][8] = new Option("其它","168")

group[5][0] = new Option("CG","200") 
group[5][1] = new Option("素材","201") 
group[5][2] = new Option("其它","202")

group[6][0] = new Option("时政","240") 
group[6][1] = new Option("文化","241") 
group[6][2] = new Option("战争","242") 
group[6][3] = new Option("社会","245") 
group[6][4] = new Option("其它","246")

group[7][0] = new Option("狗","280") 
group[7][1] = new Option("猫","281") 
group[7][2] = new Option("金鱼","282") 
group[7][3] = new Option("鸟","284") 
group[7][4] = new Option("其它","285")

group[8][0] = new Option("花卉","320") 
group[8][1] = new Option("树木","321") 
group[8][2] = new Option("其它","322")

group[9][0] = new Option("搞笑","360") 
group[9][1] = new Option("游戏","361") 
group[9][2] = new Option("动漫","362") 
group[9][3] = new Option("人体彩绘","363") 
group[9][4] = new Option("电影海报","364") 
group[9][5] = new Option("其它","365")

group[10][0] = new Option("家居","400") 
group[10][1] = new Option("汽车","401") 
group[10][2] = new Option("手机","402") 
group[10][3] = new Option("数码产品","403") 
group[10][4] = new Option("服饰","405") 
group[10][5] = new Option("其它","404")

group[11][0] = new Option("奥运","440") 
group[11][1] = new Option("篮球","441") 
group[11][2] = new Option("足球","442") 
group[11][3] = new Option("其它","443")

var temp = document.getElementById("SmlCate"); 
function Redirect(x){ 
 for (m = temp.options.length-1; m > 0; m --) 
 temp.options[m] = null 
 for (i = 0; i < group[x].length; i ++){ 
 temp.options[i] = new Option(group[x][i].text,group[x][i].value); 
 } 
 temp.options[0].selected = true 
} 
//--> 
</ script>

</body> 
</html>

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一个最简单的级联下拉菜单_javascript技巧