Probe Ajax communication layer solutions

Overview: Ajax is the fastest growing area of Web development today, and the heart of Ajax is the communication channel with the server. Probe Ajax communication layer solutions via sophisticated code examples, including extensive server-side PHP code, in this sample chapter from Understanding Ajax: Using JavaScript to Create Rich Internet Applications. First, investigate the JavaScript XMLHttpRequest object, the most complete option for performing communication with the server, and learn how to work around implementation differences between browsers. Then make some actual page requests, both in a synchronous fashion and in an asynchronous fashion. Finally, examine various fallback approaches that can be used if an older browser doesn't support XMLHttpRequest, including using either IFrames and cookie-based solutions.

here is the pdf