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Using Ajax for Creating Web Applications (14 Jul 2005)
Typically, when users enter information into an input field on a page-based web application, nothing is done with that information until they press "submit". After they press "submit" the information is sent to the server, a response is returned, notifying the user of success or failure. During this time, which typically changes based on the speed of the connection and the amount of processing being done, the user sits and waits while the page refreshes. While we've found that the actual download time doesn't lead to user frustration all by itself, we have seen that users desire (and expect) immediate response to their queriesóreloading a page can result in user confusion. For example, users often find it difficult to recognize pages containing error messages, particularly if they can't see the error messages without scrolling.
Article URL: http://www.uie.com/articles/ajax/

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