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Asynchronous JavaScript and XML (AJAX) with Java 2 Enterprise Edition
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02/02/2006, By bpcatalog.dev.java.net
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AJAX is not new. These techniques have been available to developers targeting Internet Explorer (IE) on the Windows platform for many years. Up until recently the technology was referred to as web remoting or remote scripting. Web developers have also used a combination of plugins, Java applets, and hidden frames to emulate this interaction model for some time. What has changed recently is that the inclusion of support for the XMLHttpRequest object has became ubiquitous in the mainstream browsers across all platforms. The real magic is the result of the JavaScript XMLHttpRequest object. While this object is not specified in the formal JavaScript specification, it is supported by all of the mainstream browsers today. While there are subtle differences with the JavaScript and CSS support among current generation browsers such as Firefox, IE and Safari, they are manageable. If you are required to support older browsers, AJAX may not be the answer for you.
What makes AJAX based clients unique is that the client contains page specific control logic embedded as JavaScript. The page interacts with the JavaScript based on events such as the document being loaded, a mouse click, focus changes, or even a timer.
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