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</head> <script language="JavaScript" src="/lib/factory.js"></script> <script language="JavaScript" type="text/javascript"> var xmlhttp = FactoryXMLHttpRequest(); function GetIt(url) { if( xmlhttp) { xmlhttp.open('GET', url, false); xmlhttp.send(null); document.getElementById('result').innerHTML = xmlhttp.responseText; } } </script> </head> <body> <button onclick="GetIt('/cgross/books')">Get a document</button> <p><table border="1"> <tr><td>Document</td><td><span id="result">No Result</span></td></tr> </table></p> </body> </html>
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CHAPTER 2 THE NUTS AND BOLTS OF AJAX
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The rewritten page loads the XMLHttpRequest Factory pattern implementation by using a script tag, and assigning the attribute src to be the name of the file containing the Factory pattern implementation. Then, to instantiate and assign the XMLHttpRequest instance to the variable xmlhttp, the function FactoryXMLHttpRequest is called. The remaining code remains identical to the previous example because regardless of the browser, the methods of XMLHttpRequest are identical.
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Making Asynchronous Requests
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The Ajax examples used the XMLHttpRequest object in a synchronous manner, meaning that the moment send is called, the browser stops processing other messages and waits for an answer. To illustrate that a browser locks while processing synchronous requests, the previous Ajax application will retrieve a page from a server that will wait 10 seconds before returning the content. Following is the ASP.NET source code (note that this book will focus on both Java and ASP.NET): <%@ Page Language = "C#" %> <html> <head> <title>Hanging page</title> </head> <body> <% EBVN System.Threading.Thread.Sleep( 10000); %> Hello, after a ten second sleep! </body> </html> The ASP.NET sample is written by using the C# programming language. The single statement, System.Threading.Thread.Sleep, causes the current thread on the server to sleep for 10 seconds, which means that the browser will be waiting 10 seconds for its content to be retrieved. Modifying the previous Ajax application and clicking the button to retrieve the hanging page causes the browser to appear similar to Figure 2-5. In Figure 2-5, the clicked button remains pressed because it is waiting for the content to be returned. While the browser is waiting, the user cannot switch to another tab to process other HTTP requests. A hanging browser is a problem and will make the Ajax experience potentially painful for the user.
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CHAPTER 2 THE NUTS AND BOLTS OF AJAX
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Figure 2-5. Hanging browser waiting for content to be retrieved
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The solution is to use an asynchronous Ajax XMLHttpRequest request. An asynchronous request will not block the browser, and the user could continue clicking or using other tabs of the browser. The following source code rewrites the simple Ajax application to use an asynchronous request: <html> <head> <title>Sample Page</title> </head> <script language="JavaScript" src="/lib/factory.js"></script> <script language="JavaScript" type="text/javascript"> var xmlhttp = FactoryXMLHttpRequest(); function AsyncUpdateEvent() { switch(xmlhttp.readyState) { case 0: document.getElementById('status').innerHTML = "uninitialized"; break; case 1: document.getElementById('status').innerHTML = "loading"; break; case 2: document.getElementById('status').innerHTML = "loaded"; break;
CHAPTER 2 THE NUTS AND BOLTS OF AJAX
case 3: document.getElementById('status').innerHTML = "interactive"; break; case 4: document.getElementById('status').innerHTML = "complete"; document.getElementById('result').innerHTML = xmlhttp.responseText; break; } } function GetIt(url) { if(xmlhttp) { xmlhttp.open('GET', url, true); xmlhttp.onreadystatechange = AsyncUpdateEvent; xmlhttp.send(null); } } </script> </head> <body> <button onclick="GetIt('/chap02/serverhang.aspx')">Get a document</button> <p><table border="1"> <tr> EBVN <td>Document</td> <td> <span id="status">No Result</span> </td> <td> <span id="result">No Result</span> </td></tr> </table></p> </body> </html> There are several new additions to the rewritten Ajax application, and they deal with the technical issues of loading content asynchronously. Let s start by focusing on the function GetIt. The implementation of GetIt is similar to previous Ajax application examples, except that the third parameter of the method open is true to indicate that the request will be asynchronous. This means that when the method send is called, the method will send the request, start another thread to wait for the response, and return immediately. Whenever XMLHttpRequest operates in asynchronous modes, feedback is given to the caller on the state of the request. The property onreadystatechange is a function that receives the feedback. It is important to note that the feedback function must be assigned before each send because upon completion of the request, the property onreadystatechange is reset. This is evident in the sources of the Mozilla-based browsers. The property onreadystatechange is assigned the function AsyncUpdateEvent. In the implementation of AsyncUpdateEvent is a switch statement that tests the current state of the request. When an asynchronous request is made, the script is free to continue executing other code.
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