Ajax is based on the JavaScript,
DOM, and XMLHttpRequest technologies. The ???A??? in Ajax is for
Asynchronous, which implies that the web page sending the Ajax request
continues to be processed while the Ajax request is processed on the server
and an Ajax response returned to the browser. The web page or sections in
the web page get refreshed with the XML data in the Ajax response
without posting the web page to the server. Without Ajax the complete
web page had to be reloaded. Ajax has the following advantages over non-
Ajax web applications.
1. Reduced response time and reduced server load as the complete web
page is not reposted.
2. Reduced bandwidth of web applications as only data is transferred
and the HTML format is applied in the browser.
3. Separation of data, format and style.
Motivation for this Book
A vast array of Ajax frameworks is available and it is often a dilemma as
to which Ajax framework would be the most suitable. Ajaxian.com1
conducted a survey on Ajax frameworks and found that 25% of Ajax
developers would rather not use any framework and prefer to use
XMLHttpRequest directly. Out of the frameworks that are used
Prototype is the most commonly used, because Prototype reduces the
JavaScript required in an Ajax application. PHP is the most commonly
used server side language for Ajax, but Xajax, the most commonly used
Ajax framework for PHP, is used by only 4% of Ajax developers.
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