Sometimes, the processing performed by your PHP/Oracle application may take time, making the user wait until the database server produces the results and then the web/PHP server sends them to the browser. To get through that problem, you might incorporate rich, interactive UIs into your application, allowing the user to keep working with the page displayed in the browser while the web/PHP and database servers are still working in the background on preparing the results to return. This is where the AJAX technologies may come in very handy.
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AJAX is a new, yet effective approach to web development, employing a combination of technologies, such as JavaScript, XML and DOM, which, when used together, makes it possible for a browser to asynchronously interact with the web server, significantly improving the responsiveness of your application. You can think of AJAX as providing a way to dynamically modify a certain portion of the page displayed in...