Ajax and php 3_1

php对xml的创建

注意对源码的检查

		var xmlHttp=createXmlHttpRequestObject();
		function createXmlHttpRequestObject(){
			var xmlHttp;
			try{
				xmlHttp=new XMLHttpRequest();
			}catch(e){
				var XmlHttpVersions=new Array(
				"MSXML2.XMLHTTP.6.0",
				"MSXML2.XMLHTTP.5.0",
				"MSXML2.XMLHTTP.4.0",
				"MSXML2.XMLHTTP.3.0",
				"MSXML2.XMLHTTP",
				"Mircosoft.XMLHTTP"
				);
				
				for(var i=0;i<XmlHttpVersions.length;i++){
					try{
						xmlHttp=new ActiveXObject(XmlHttpVersion[i]);
					}catch(e){
						}
					}
				}
			if(xmlHttp){
				return xmlHttp;
				}else{
					alert('Error create the XMLHttpRequest object.');
					}
			}
			
		function process(){
			if(xmlHttp){
				try{
					xmlHttp.open("GET","phptest.php",true);
					xmlHttp.onreadystatechange=handleRequestStateChange;
					xmlHttp.send(null);
				}catch(e){
					alert("Can't connect to server:\n"+e.toString());
					}
				}
			}
			
			function handleRequestStateChange(){
				if(xmlHttp.readyState==4){
					if(xmlHttp.status==200){
						try{
							handleServerResponse();
						}catch(e){
							alert("Error reading the response:"+e.toString());
							}
						}else{
							alert("There was a problem retrieving the data:\n"+xmlHttp.statusText);
							}
					}
				}
				
			function handleServerResponse(){
				//reading from servece info
				var xmlResponse=xmlHttp.responseXML;
				//招出在ie和opera下抛出的错误
				if(!xmlResponse||!xmlResponse.documentElement){
					throw("Invalid XML structure:\n"+xmlHttp);
					}
				var rootNodeName=xmlResponse.documentElement.nodeName;
				if(rootNodeName=="parsererror") throw('Invalid XML structure');
				
				xmlRoot=xmlResponse.documentElement;
				//因为Element 是复数所以加s
				titleArray=xmlRoot.getElementsByTagName("title");
				isbnArray=xmlRoot.getElementsByTagName("isbn");
				
				var html="";
				//如果写成i<=titleArray.length,会造成数组溢出，不然会找不到子元素
				for(var i=0;i<titleArray.length;i++){
					html+=titleArray.item(i).firstChild.data+","+isbnArray.item(i).firstChild.data+"<br/>"
					}
				myDiv=document.getElementById("myDiv");
				myDiv.innerHTML=html;
				}

<?php
	header('Content-Type:text/xml');
	$dom=new DOMDocument();
	//建立个元素的方法
	$response=$dom->createElement('response');
	$dom->appendChild($response);
	
	$books=$dom->createElement('books');
	$response->appendChild($books);
	
	$title=$dom->createElement('title');
	$titleText=$dom->createTextNode('就一个测试你以为我会啥到照着你书本打一串英语字母么？');
	$title->appendChild($titleText);
	
	$isbn=$dom->createElement('isbn');
	$isbnText=$dom->createTextNode('1-904811-82-5');
	$isbn->appendChild($isbnText);
	
	$book=$dom->createElement('book');
	$book->appendChild($title);
	$book->appendChild($isbn);
	
	$books->appendChild($book);
	
	$xmlString=$dom->saveXML();
	echo $xmlString;
?>