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Answer Posted / rajendra
AJAX (Asynchronous JavaScript and XML) is a newly coined
term for two powerful browser features that have been
around for years, but were overlooked by many web
developers until recently when applications such as Gmail,
Google Suggest, and Google Maps hit the streets.
Asynchronous JavaScript and XML, or Ajax (pronounced "Aye-
Jacks"), is a web development technique for creating
interactive web applications using a combination of XHTML
(or HTML) and CSS for marking up and styling information.
(XML is commonly used, although any format will work,
including preformatted HTML, plain text, JSON and even
EBML).
The Document Object Model manipulated through JavaScript to
dynamically display and interact with the information
presented
The XMLHttpRequest object to exchange data asynchronously
with the web server. In some Ajax frameworks and in some
situations, an IFrame object is used instead of the
XMLHttpRequest object to exchange data with the web server.
Like DHTML, LAMP, or SPA, Ajax is not a technology in
itself, but a term that refers to the use of a group of
technologies together. In fact, derivative/composite
technologies based substantially upon Ajax, such as AFLAX,
are already appearing.
Ajax applications are mostly executed on the user's
computer; they can perform a number of tasks without their
performance being limited by the network. This permits the
development of interactive applications, in particular
reactive and rich graphic user interfaces.
Ajax applications target a well-documented platform,
implemented by all major browsers on most existing
platforms. While it is uncertain that this compatibility
will resist the advent of the next generations of browsers
(in particular, Firefox), at the moment, Ajax applications
are effectively cross-platform.
While the Ajax platform is more restricted than the Java
platform, current Ajax applications effectively fill part
of the one-time niche of Java applets: extending the
browser with portable, lightweight mini-applications.
Ajax isn't a technology. It's really several technologies,
each flourishing in its own right, coming together in
powerful new ways. Ajax incorporates:
* standards-based presentation using XHTML and CSS;
* dynamic display and interaction using the Document Object
Model;
* data interchange and manipulation using XML and XSLT; *
asynchronous data retrieval using XMLHttpRequest;
* and JavaScript binding everything together.
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