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Tips & Tricks: AJAX – Not Just Limited to XMLHttpRequest
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04/22/2006, By Shaurabh Bharti
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This tutorial starts with an Introduction followed by a short discussion on AJAX merits and demerits. The following section is about Implementation, where most of issues concerned have been handled. It's followed by a complete running example code, which can be simply taken and run on local server. T finish, alternative techniques to AJAX besides XMLHttpRequest will be explained.
Issues with Ajax
However, even with these simple functionalities, Ajax has certain issues to deal with. First and foremost comes the use of Back button. Users always expect to undo their mistakes by going back to their History. However, little scope is left for such interaction where pages are updated dynamically without being refreshed. This issue is important, and may be handled by using invisible iFrames, which keeps track of changes, and hence can be used to recover history.
Another issue could be bookmarking a particular Web page at a particular stage. This can be achieved by editing the URL fragment identifier. It may be used to keep track of different stages of interaction by user.
Another issue may be latency. Latency of a response may vary depending upon network, and hence might not give the same interaction to user every time. In addition, it also requires JavaScript to be enabled on the browser.
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