cities.xml
<?xml version="1.0" encoding="GB2312"?> <china> <province name="吉林省"> <city>长春</city> <city>吉林市</city> <city>四平</city> <city>松原</city> <city>通化</city> </province> <province name="辽宁省"> <city>沈阳</city> <city>大连</city> <city>鞍山</city> <city>抚顺</city> </province> <province name="山东省"> <city>济南</city> <city>青岛</city> <city>威海</city> <city>烟台</city> <city>潍坊</city> </province> <province name="湖北省"> <city>武汉</city> <city>广水</city> <city>孝感</city> <city>荆州</city> <city>黄石</city> <city>鄂州</city> <city>黄冈</city> </province> </china>
city.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>二级联动</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<select id="province" >
<option>--请选择--</option>
<option value="湖北省">湖北省</option>
<option value="吉林省">吉林省</option>
<option value="辽宁省">辽宁省</option>
<option value="山东省">山东省</option>
</select>
<select id="city">
<option>--请选择--</option>
</select>
</body>
<script type="text/javascript">
document.getElementById("province").onchange=function(){
//当前选中的省
var provinceValue=this.value;
var cityNode=document.getElementById("city");
//删除市下拉列表中的前一个省的城市项
var cityOptions=cityNode.getElementsByTagName("option");
for(var i=cityOptions.length-1;i>0;i--){
cityNode.removeChild(cityOptions[i]);
}
var xmlDoc=parseXML("cities.xml");
var xmlProvinceElements=xmlDoc.getElementsByTagName("province");
//下拉列表中添加选中省的城市项
for(var i=0;i<xmlProvinceElements.length;i++){
if(xmlProvinceElements[i].getAttribute("name")==provinceValue){
var xmlCityElements=xmlProvinceElements[i].getElementsByTagName("city");
for(var j=0;j<xmlCityElements.length;j++){
var xmlCityName=xmlCityElements[j].firstChild.nodeValue;
var cityOptionElement=document.createElement("option");
cityOptionElement.setAttribute("value",xmlCityName);
cityOptionElement.appendChild(document.createTextNode(xmlCityName));
cityNode.appendChild(cityOptionElement);
}
break;
}
}
}
/*
* 加载XML文件
* @param {Object} filename
*/
function parseXML(filename){
try{ //Internet Explorer 创建一个空的xml文档
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
}catch(e){ // Firefox,Mozilla,Opera....
try {
xmlDoc=document.implementation.createsDocument("","",null);
}catch(e){}
}
//关闭异步加载
xmlDoc.async=false;
//加载XML文档
xmlDoc.load(filename);
return xmlDoc;
}
</script>
</html>JavaScript省市二级联动,布布扣,bubuko.com
原文：http://blog.csdn.net/user_longling/article/details/38497925