下拉框连动的小例子（.htm版）
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2022-04-15 10:41:39
<head>
<title>list</title>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<script language="javascript">
<!--
var onecount;
onecount=0;
subcat = new array();
subcat[0] = new array("徐汇区","01","001");
subcat[1] = new array("嘉定区","01","002");
subcat[2] = new array("黄浦区","01","003");
subcat[3] = new array("南昌市","02","004");
subcat[4] = new array("九江市","02","005");
subcat[5] = new array("上饶市","02","006");
onecount=6;
function changelocation(locationid)
{
document.myform.smalllocation.length = 0;
var locationid=locationid;
var i;
document.myform.smalllocation.options[0] = new option(====所有地区====,);
for (i=0;i < onecount; i++)
{
if (subcat[i][1] == locationid)
{
document.myform.smalllocation.options[document.myform.smalllocation.length] = new option(subcat[i][0], subcat[i][2]);
}
}
}
//-->
</script>
</head>
<body>
<form name="myform" method="post">
<select name="biglocation" onchange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedindex].value)">
<option value="01" selected>上海</option>
<option value="02">江西</option>
</select>
<select name="smalllocation">
<option selected value="">==所有地区==</option>
</select>
</form>
<script language="javascript">
<!--
changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedindex].value);
//-->
</script>
</body>
</html>