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AJAX: Making the HTML User Experience Almost As Pleasant as Flash (Part Two of Two)
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11/17/2005, By Rob Gonda
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AJAX can make the HTML user experience almost as pleasant as Flash. The main advantage of Flash, in spite of its vector animations, is that you never reload the page. Flash Remoting allows you to interface with the server in the background and AJAX does exactly the same for HTML pages.
Another great advantage of AJAX is that it improves load time. For example, imagine a typical site: it has a design frame and content in the center area. Every click has to reload the entire frame to update the content. Ideally, you wouldn't have to transfer the code for the frame and download any of its graphic components again. Caching certainly helps, but AJAX can make it even faster. Listings 4 and 5 show a simple example in which the content is being generated in the ColdFusion model and passed back to the JavaScript controller. For simplicity, in this example I actually added the content directly in the Model.cfm page. In real-life examples, the ideal way would be to actually include a view template with a cfinclude inside the cfsavecontent tag; by doing that your views will not depend on the AJAX component. Perhaps you won't see a huge speed difference just by running this example; this is due to the fact it doesn't have any design elements. As an experiment, try to add a full design frame to my example with an average page weight of 100k or 200k in graphics and compare load times.
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