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Ajax : Tutorial using Sarissa
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03/03/2006 By Ross Shannon
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Ajax is actually a family of technologies that have been available for years. The means to make requests to the server using only JavaScript were built into Internet Explorer 5.5, but the possibilities of the technology were overlooked. It was only in 2005 that the techniques were rediscovered and used, notably to excellent effect in Google’s » GMail web application.
So let’s take each of those parts in isolation. Ajax is:
Asynchronous
This means that when you send a request, you wait for the response to come back, but are free to do other things while you wait. The response probably won’t come back immediately, so you set up a function that will wait for it to be sent by the server, and react to it once that happens.
JavaScript
JavaScript is used to make a request to the server. Once the response is returned by the server, you will generally use some more JavaScript to modify the current page’s document object model in some way to show the user that the submission went through successfully.
XML
The data that you receive back from the server will often be packaged up as a snippet of XML, so that it can be easily processed with JavaScript. This data can be anything you want, and as long as you want.
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