Download PDF by Thomas A. Powell: Ajax: The Complete Reference

By Thomas A. Powell

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This approach is very limited as there are only two dimensional values that have to be encoded as simple integers that can be passed back. Fortunately, it turns out that if this method is used in conjunction with a cookie, all sorts of data can be passed back to the browser in response to an image request. Images and Cookies Technique To expand the image communication pattern to a truly valuable two-way method, we add in a batch of cookie power. The ever-present rating example can be extended to respond with the user’s rating, the current average rating, and the total number of votes.

Onerror = function(){cancelRequest(target, "Server error",current Request,timer);}; It is also important to address the possibility that the response image is not generated in a timely manner. To mitigate such a problem we can set a timeout value, and if the timer fires before receiving the image, alert the user. /* function to cancel request if network timeout occurs */ networkTimeout = function(){cancelRequest(target, "Network timeout",currentRequest);}; /* define network timeout in milliseconds and bind to timeout function */ var timer = setTimeout("networkTimeout()",timeout*1000); When employing this technique, it is important to clear any timeouts that may be running if data is received successfully.

There certainly will be many changes, both visual and nonvisual, from the application of Ajax which we explore throughout the book and especially in Chapter 8. Summary Ajax (Asynchronous JavaScript and XML) is more than an acronym; it is a whole new way to approach Web application design. By sending data behind the scenes using JavaScript, typically in conjunction with the XMLHttpRequest object, you can get data incrementally and make partial page updates rather than redrawing the whole window.

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