Web Design

Ajax: The Complete Reference by Thomas A. Powell

By Thomas A. Powell

The Definitive consultant to Ajax internet program Development
Evolve from the click-and-wait programming trend to the newest internet 2.0 paradigm utilizing this accomplished consultant to Ajax. Written by way of net improvement professional Thomas Powell, the publication lays out each characteristic of Ajax along specified causes and real-world code examples.
Ajax: the whole Reference explains how one can create and attempt Ajax-enabled internet purposes utilizing the XMLHttpRequest item in addition to replacement JavaScript-based conversation mechanisms. you are going to discover quite a few pattern purposes that includes rising user-interface conventions and construct purposes that deal with real-world networking and protection matters. a powerful conversation library is built in the course of the e-book that allows you to architect versatile Ajax functions. the most recent applied sciences equivalent to internet companies, Flash-Ajax integration, client-side templates, Comet, and Offline entry also are lined. realize the way forward for internet improvement today!
- paintings with conventional JavaScript communique techniques like iframes
- discover the entire quirks and information 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 quite a few 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 corresponding to vehicle recommend, click-to-edit, and drag-and-drop
- remedy troubling Ajax structure difficulties, together with again button, heritage, and bookmarking issues
- research Ajax's position in net 2.0 and internet services
- discover push variety conversation utilizing Comet and Flash
- become aware of the way forward for offline internet software entry and operation

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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.

Like any good “Hello World” example, you should get the idea of the demonstrated technology without all the details. Unfortunately, as shown by issues such as trying to run examples locally, it may not be as easy to develop Ajax applications as we might like. However, from the example you should also see that Ajax is really just a special usage of client-side JavaScript that allows you to make and respond to HTTP requests and does not have any particular affinity for one Web server-side programming environment or another.

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.

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