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<body>
<select id="provinceID">
<option> 选择省份</option>
<option> 广东</option>
<option> 湖南</option>
<option> 江苏</option>
</select>
<hr/>
<select id="cityID" style="width: 90px">
<option> 选择城市</option>
</select>
<script type="text/javascript">
document.getElementById("provinceID").onchange=function(){
var citySelectElement=document.getElementById("cityID");
var size=citySelectElement.options.length;
if(size>1){
for(var i=size-1;i>0;i--)
{
citySelectElement.removeChild(citySelectElement.options[i]);
}
}
var optionElement=this[this.selectedIndex];
var province=optionElement.firstChild.nodeValue;
//创建引擎
var xhr=createAJAX();
var method="POST";
var url="${pageContext.request.contextPath}/ProvinceCityXMLServlet?time="+new Date().getTime();
xhr.open(method,url);
xhr.setRequestHeader("content-type","application/x-www-form-urlencoded");
var content="province="+province;
xhr.send(content);
xhr.onreadystatechange=function(){
if(xhr.readyState==4){
if(xhr.status==200){
var xmlDocument=xhr.responseXML;
//解析xml文档
var cityElementArray=xmlDocument.getElementsByTagName("city");
var size=cityElementArray.length;
for(var i=0;i<size;i++){
var cityElement=cityElementArray[i];
var city=cityElement.firstChild.nodeValue;
var optionElement=document.createElement("option");
optionElement.innerHTML=city;
var citySelectElement=document.getElementById("cityID");
citySelectElement.appendChild(optionElement);
}
}
}
}
}
function createAJAX(){
var xhr = null;
try{
xhr = new ActiveXObject("microsoft.xmlhttp");
}catch(e1){
try{
xhr = new XMLHttpRequest();
}catch(e2){
//alert("更换浏览器");
}
}
return xhr;
}
</script>
</body>
servlet部分： request.setCharacterEncoding("utf-8"); String province=request.getParameter("province"); response.setContentType("text/xml;charset=utf-8"); PrintWriter pw=response.getWriter(); pw.write("<root>"); if("广东".equals(province)){ pw.write("<city>广州</city>"); pw.write("<city>佛山</city>"); pw.write("<city>中山</city>"); pw.write("<city>深圳</city>"); pw.write("<city>珠海</city>"); } else if("湖南".equals(province)){ pw.write("<city>张家界</city>"); pw.write("<city>株洲</city>"); pw.write("<city>湘潭</city>"); pw.write("<city>长沙</city>"); } else if("江苏".equals(province)){ pw.write("<city>南京</city>"); pw.write("<city>苏州</city>"); pw.write("<city>无锡</city>"); pw.write("<city>海门</city>"); } pw.write("</root>"); } （编辑：李大同）
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