- <!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>