AJAX is a rapidly emerging programming technique that attracts lots of attention nowadays. Ajax is a blend of several technologies. Ajax stands for-Asynchronous JavaScript and XML. It is a technique used to develop web based applications. The improved interactivity of AJAX-powered interfaces bridges the traditional gap between Desktop and Web applications. Ability to mash-up services or functionality in a rich client allows building powerful new or improving existing web software. Well-applied AJAX is a definite advantage for any kind of web application – from simple sites to complex and sophisticated business applications.
Web applications developed on Ajax technology can perform most of the functions that the native application of the user’s system can. This is because while interacting with the server on which they reside, a very small amount of data is exchanged back and forth at a time. This leads to pages being updated in the user’s browser only, rather than being refreshed completely. It’s a model modified from the web’s unique use as a hypertext medium.
Unlike in the classic web development model, which takes additional layers to react and respond to a user request, an AJAX engine communicates with the server on behalf of the user by rendering a user interface. The user interacts with the application asynchronously, that is, independent of communication with the server. As such, user’s interaction with the application is not even suspended temporarily.
Contrary to the classic web application model where most user actions in the interface trigger an HTTP request back to a web server with the server - after processing - returns an HTML page to the client, this model introduces an intermediary layer - an AJAX engine.
Features of Ajax
- The Document Object Model, which is manipulated through JavaScript to dynamically demonstrate and interrelate with the information presented.
- Retrieval of asynchronous data using XML Http Request
- XHTML and CSS for marking up and styling information
Accessibility
The most important advantage of AJAX is that it decreases the delay caused while surfing and makes it a speedy session. Your web page can now be loaded in fraction of seconds. Normally, when you request for a web page, several applications start working simultaneously to execute the request. All these processes take some time and in case, if the page is loaded with heavy graphics then the wait becomes even longer. AJAX technology cuts down the waiting time of the user. It is due to this reason that this phenomenal has become a great hit amongst the users.
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