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我寫的一個級聯下拉式清單：
代碼如下： 複製代碼 代碼如下:<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
#d1 {
width: 400px;
height: 250px;
background-color: #FFE4B5;
margin: 40px auto;
}
#d1_head {
color: white;
font-size: 20px;
font-family: "Arial";
height: 24px;
background-color: bule;
}
#d1_content {
padding-left: 30px;
padding-top: 30px;
}
</style>
<script src="prototype-1.6.0.3.js"></script>
<script type="text/javascript">
function doAction(index) {
var arr = new Array;
arr[0] = [ new Option('--研究方向--', '-1') ];
arr[1] = [ new Option('商務英語', 'english1'),
new Option('英美文學', 'english2') ];
arr[2] = [ new Option('格線運算', 'computer1'),
new Option('電腦軟體', 'computer2'),
new Option('圖形計算', 'computer3') ];
$('s2').innerHTML = '';
for (i = 0; i < arr[index].length; i++) {
$('s2').options[i] = arr[index][i];
}
}
</script>
</head>
<body style="font-size:30px;">
<div id="d1">
<div id="d1_head">專業選擇</div>
<div id="d1_content">
<form>
<select naem="s1" id="s1" style="width:120px;"
onchange="doAction(this.selectedIndex);">
<option value="-1">--專業--</option>
<option value="english">--英語--</option>
<option value="computer">--電腦--</option>
</select> <select name="s2" id="s2" style="width:120px;">
<option value="-1">--研究方向--</option>
</select> <input type="submit" value="確認" />
</form>
</div>
</div>
</body>
</html>
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