<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>menu2level.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function loadXML(){
var xmlDoc;
try{
//IE
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
}catch(e){
try{
xmlDoc = document.implementation.createDocument("","",null);
}catch(e){
alert(e.message);
return;
}
}
xmlDoc.async=false;
xmlDoc.load("cities.xml");
return xmlDoc;
}
//网页加载完在加载 完成省份加载
onload=function(){
var xmlDocument = loadXML();
var provinceArr =xmlDocument.getElementsByTagName("province");
var proSize = provinceArr.length;
for(var i=0;i<proSize;i++){
//创建option节点
var optionElement = document.createElement("option");
var provinceName = provinceArr[i].getAttribute("name");
//创建文本节点
var textElement =document.createTextNode(provinceName);
optionElement.appendChild(textElement);
optionElement.setAttribute("value", provinceName);
var node = document.getElementById("province");
node.appendChild(optionElement);
}
}
//省份改变事件
function changeProvince(node){
//获取选择的角标
var index = node.selectedIndex;
//获取对应的省份名
var provinceName = node.options[index].value;
loadCities(provinceName);
}
//根据省份编号加载城市信息
function loadCities(proName){
var xmlDocument = loadXML();
var provinceArr =xmlDocument.getElementsByTagName("province");
//获取城市的元素
var citySelectEle = document.getElementById("cities");
var size = citySelectEle.options.length;
for(var i=size;i>0;i--){
citySelectEle.remove(i);
}
//获取省份的个数
var proSize = provinceArr.length;
var proElement;
//获取对应的省份元素
for(var i=0;i<proSize;i++){
if(provinceArr[i].getAttribute("name")==proName){
proElement = provinceArr[i];
break;
}
}
//获取省份的城市信息
var citiesArr = proElement.getElementsByTagName("city");
var len = citiesArr.length;
for(var i=0;i<len;i++){
//创建option节点
var optionElement = document.createElement("option");
//获取城市名
var cityName = citiesArr[i].firstChild.nodeValue;
//创建文本节点
var textElement =document.createTextNode(cityName);
optionElement.appendChild(textElement);
optionElement.setAttribute("value", cityName);
citySelectEle.appendChild(optionElement);
}
}
function getValue(){
var pro = document.getElementById("province").value;
var city = document.getElementById("cities").value;
alert(pro+":"+city);
}
</script>
</head>
<body>
<select id="province" onchange="changeProvince(this)">
<option value="" selected="selected">--省份--</option>
</select>
<select id="cities">
<option value="" selected="selected">--城市--</option>
</select>
<input type="button" value="弹出" onclick="getValue()"/>
</body>
</html>
效果如下：
http://img.blog.csdn.net/20140315235043343?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGl1aGVuZ2h1aTUyMDE=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast
cities.xml文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<xml-body>
<province name="陕西">
<city>西安</city>
<city>汉中</city>
<city>宝鸡</city>
<city>延安</city>
</province>
<province name="广东">
<city>佛山</city>
<city>深圳</city>
<city>广州</city>
<city>汕头</city>
</province>
<province name="辽宁">
<city>大连</city>
<city>铁岭</city>
<city>鞍山</city>
<city>抚顺</city>
</province>
</xml-body>