select 动态菜单
<form>
<select id="province">
<option value="">省份</option>
<option value="北京">北京</option>
<option value="上海">上海市</option>
<option value="河南">河南省</option>
<option value="河北">河北省</option>
<option value="江苏">江苏省</option>
</select>
<select id="city">
<option>城市</option>
</select>
</form>
//javascript 部分
<script type="text/javascript">
window.onload=initForms;
function initForms(){
if(!document.getElementById) return false;
document.getElementById("province").selectedIndex=0;
document.getElementById("province").onchange=chgCity;
}
function chgCity(){
var bjCity=new Array("北京市");
var shCity=new Array("上海市");
var hnCity=new Array("郑州","安阳","濮阳","新乡","鹤壁","洛阳");
var hbCity=new Array("石家庄","保定","邯郸","秦皇岛","邢台","临漳");
var jsCity=new Array("南京","徐州","连云港","宿迁","镇江","无锡");
var theCity=document.getElementById("city");
var Cities=this.options[this.selectedIndex].value;
switch(Cities){
case "北京":
theCity.options.length=0;
for(var i=0;i<bjCity.length;i++){
theCity.options[theCity.options.length]=new Option(bjCity[i]);
}
break;
case "上海":
theCity.options.length=0;
for(var i=0;i<shCity.length;i++){
theCity.options[theCity.options.length]=new Option(shCity[i]);
}
break;
case "河南":
theCity.options.length=0;
for(var i=0;i<hnCity.length;i++){
theCity.options[theCity.options.length]=new Option(hnCity[i]);
}
break;
case "河北":
theCity.options.length=0;
for(var i=0;i<hbCity.length;i++){
theCity.options[theCity.options.length]=new Option(hbCity[i]);
}
break;
case "江苏":
theCity.options.length=0;
for(var i=0;i<jsCity.length;i++){
theCity.options[theCity.options.length]=new Option(jsCity[i]);
}
break;
case "":
theCity.options.length=0;
theCity.options[0]=new Option("城市");
break;
default:
break;
}
}
</script>
