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Mastering Ajax, Part 2: Make asynchronous requests with JavaScript and Ajax
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01/17/2006, By Brett McLaughlin
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The Web 2.0 dispenses with this very visible back-and-forth (to a large degree). As an example, visit a site like Google Maps or Flickr (links to both of these Web 2.0, Ajax-powered sites are in Resources). On Google Maps, for example, you can drag the map around and zoom in and zoom out with very little redrawing. Of course, requests and responses do go on here, but all behind the scenes. As a user, the experience is much more pleasant and feels a lot like a desktop application. This new feel and paradigm is what you see when someone refers to Web 2.0.
What you should care about then is how to make these new interactions possible. Obviously, you've still got to make requests and field responses, but it's the redrawing of the HTML for every request/response interaction that gives the perception of a slow, clunky Web interface. So clearly you need an approach that allows you to make requests and receive responses that include only the data you need, rather than an entire HTML page as well. The only time you want to get a whole new HTML page is when ... well ... when you want the user to see a new page.
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