AJAX(Asynchronous JavaScript and XML)

AJAX(Asynchronous JavaScript and XML)
Ajax (Asynchronous JavaScript and XML) is a way of programming for the Web. Data, content, and design are joined together into a seamless whole. When a user clicks on something on an Ajax driven application, there is very little slowdown time. The page simply displays what they’re asking for.
So Ajax is a way of developing Web applications that combines:

  • XHTML and CSS standards based presentation
  • Interaction with the page using DOM
  • Data interchange with XML and XSLT
  • Asynchronous data retrieval with XMLHttpRequest
  • JavaScript to tie it all together

In the traditional Web application, the interaction between the customer and the server goes like in the following way:
Visitor makes a request, Server processes request and sends data to the browser while the visitor waits, Visitor clicks on a link or interacts with the application, Server processes request and sends data back to the browser while the visitor waits.
Ultimately there is a lot of customer waiting.
The Ajax engine works within the Web browser (through JavaScript and the DOM) to render the Web application and handle any requests that the visitor might have of the Web server. The beauty of it is that because the Ajax engine is handling the requests, it can hold most information in the engine itself, while allowing the interaction with the application and the customer to happen asynchronously and independently of any interaction with the server.
Asynchronous: In standard Web applications, the interaction between the customer and the server is synchronous. This means that one has to happen after the other. If a customer clicks a link, the request is sent to the server, which then sends the results back.
With Ajax, the JavaScript that is loaded when the page loads handles most of the basic tasks such as data validation and manipulation, as well as display rendering the Ajax engine handles without a trip to the server. At the same time that it is making display changes for the customer, it is sending data back and forth to the server. But the data transfer is not dependent upon actions of the customer.

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