Js实现简单的省市级联的效果

需要注意的是当需要动态添加项的时候一定要
先var newoption=new Option("项","值");
然后再 select.options.add(newoption);
这样才能添加进去
代码如下:

<html>
<head>
<script language="javascript">
function changeSever()
{
var newop1,newop2; //声明两个变量用来添加Option项
switch(document.form1.select1.value) //判断选择的项,注意这里是值不是所选的项,是所选项的值
{
case "lt":
newop1=new Option("雷霆1区","lt1");
newop2=new Option("雷霆2区","lt2");
break;
case "ty":
newop1=new Option("天涯1区","lt1");
newop2=new Option("天涯2区","lt2");
break;
}
document.form1.select2.options.length=0; //把所有的项清空
document.form1.select2.options.add(new Option("请选择相应的服务器"));
document.form1.select2.options.add(newop1); //添加项
document.form1.select2.options.add(newop2);
}
</script>
</head> <body>
<form name="form1" method="post" action="">
<select name="select1" onChange="changeSever()"> //父下拉框
<option selected>请选择所在区</option>
<option value="lt">雷霆</option>
<option value="ty">天涯</option>
</select>
<p><select name="select2"> //子下拉框
<option>请选择服务器</option>
</select>
</form> </body>
</html>
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