Download e-book for iPad: Ajax: The Complete Reference by Thomas A. Powell

By Thomas A. Powell

ISBN-10: 007149216X

ISBN-13: 9780071492164

The Definitive advisor to Ajax internet software Development
Evolve from the click-and-wait programming trend to the newest net 2.0 paradigm utilizing this entire consultant to Ajax. Written by way of internet improvement professional Thomas Powell, the e-book lays out each function of Ajax along distinctive causes and real-world code examples.
Ajax: the entire Reference explains the way to create and attempt Ajax-enabled net purposes utilizing the XMLHttpRequest item in addition to substitute JavaScript-based communique mechanisms. you will discover various pattern functions that includes rising user-interface conventions and construct functions that deal with real-world networking and defense matters. a strong communique library is built in the course of the ebook that allows you to architect versatile Ajax functions. the most recent applied sciences similar to net prone, Flash-Ajax integration, client-side templates, Comet, and Offline entry also are lined. observe the way forward for internet improvement today!
- paintings with conventional JavaScript communique ways like iframes
- discover the entire quirks and info within the XMLHttpRequest object
- deal with disparate info codecs, together with XML, JSON, CSV, YAML, and more
- take care of networking concerns, together with timeouts, retries, reaction ordering, and a number of server and content material errors
- Simplify JavaScript programming utilizing open-source Ajax libraries like YUI
- safe Ajax functions utilizing authentication, obfuscation, and encryption
- enforce universal Ajax UI styles akin to vehicle recommend, click-to-edit, and drag-and-drop
- resolve troubling Ajax structure difficulties, together with again button, historical past, and bookmarking issues
- research Ajax's position in net 2.0 and net services
- discover push variety conversation utilizing Comet and Flash
- detect the way forward for offline internet software entry and operation

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A" . $average . "a" . gif'; $fp = fopen($filename, 'rb'); header("Content-Type: image/gif"); header("Content-Length: " . innerHTML = "Server available. "; 37 38 Part I: Core Ideas // dump the response image and end the script fpassthru($fp); exit; } When the image arrives, the result is read from the cookie in the script’s response callback function. While this sounds easy enough, reading the cookie properly does require a bit of string manipulation as shown in the next code fragment. length); } return null; } var results = readCookie("PollResults"); With the response in hand and unpacked from the cookie, it is put in the page using basic DOM methods.

Length); } return null; } var results = readCookie("PollResults"); With the response in hand and unpacked from the cookie, it is put in the page using basic DOM methods. innerHTML = "Thank you for voting. You rated this a " + rating + ". There are " + total + " total votes. The average is " + average + ". html and the network transmission is shown here to illustrate exactly how data was passed. Chapter 2: P r e - A j a x J a v a S c r i p t C o m m u n i c a t i o n s Te c h n i q u e s 39 PART I While the image cookie technique would seem to solve the need for two-way data transmission, do note that this technique has a major weakness: if cookies are turned off, it is going to fail.

In this scenario you will present the user with a set of choices to indicate their feelings about a particular product, idea, page, or whatever you are interested in finding their opinion on. The user interface for the rating system might range from a simple set of radio buttons to more complex user interface widgets such as a slider 15 16 Part I: Core Ideas or even some form of animated rollovers such as the ubiquitous star ratings found on many websites. Whatever the visual presentation and form of the communication used in the rating system, the underlying approach will be quite similar.

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Ajax: The Complete Reference by Thomas A. Powell

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