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Advanced Ajax: Architecture and Best Practices by Shawn M. Lauriat

By Shawn M. Lauriat

“I greatly loved how this e-book covers the entire Ajax program lifecycle and never merely coding recommendations. a person who's trying to develop into a qualified front-end developer will savour the architectural perception and most sensible practices brought by means of this book.”  — Andi Gutmans, Co-Founder & Co-Chief know-how Officer of Zend applied sciences   Mission-Critical Ajax: Maximizing Scalability, functionality, safety, Reliability, and Maintainability   complex Ajax: structure and most sensible Practices is the definitive consultant to development business-critical, production-quality internet purposes with Ajax. Shawn M. Lauriat systematically addresses the layout, structure, and improvement matters linked to Ajax, supplying confirmed styles and strong code examples to be had in no different ebook. You’ll locate top practices for addressing the entire spectrum of matters company Ajax builders face: scalability, functionality, safety, reliability, flexibility, maintainability, and reusability.   Writing for skilled net builders, Lauriat offers clean rules and stylish ideas: meaty technical content material, awarded with remarkable readability. one of many subject matters he covers in extraordinary intensity: cleanly enforcing JavaScript customized occasions to lessen coupling and to augment flexibility; overcoming Ajax’s conventional accessibility obstacles; lowering community latency via compression and different strategies; and masses extra. assurance comprises  making plans Ajax interfaces for simplicity, readability, and intuitiveness developing scalable, maintainable architectures for client-side JavaScript utilizing the newest instruments to profile, validate, and debug client-side code Architecting the server facet for protection and performance, whereas proscribing loaded facts, items, and activities to present requests retaining opposed to the main frequent and important Ajax safeguard hazards Optimizing each component to an Ajax program, from server-side scripts to database interactions Introducing state-of-the-art Ajax: video game improvement, Ajax with canvas, and Ajax for company functions concerning the website This book’s spouse website (http://advancedajax.frozen-o.com) doesn’t simply supply all of the code: It indicates code examples in motion, as development blocks of a true internet program interface.

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Extra info for Advanced Ajax: Architecture and Best Practices

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Even a small change, such as changing the h2s and h3s to styled divs, makes the maximum listening time explode to well over 1000 seconds; this difference occurs because changing out the heading tags for div removed the relationship between the sections of the page, thus removing the user’s ability to navigate between them. 32 Chapter 1 Usability Listening time varies greatly by the users’ settings in their screen reader, all of which have variable speeds. The measurements used in this section come from an analysis given normal, average settings.

Using non-semantic markup does not make it impossible to parse out the same elements, but the code and the performance of that code will suffer. Take the following two pairs of code samples, each having the content of an XHTML DOM for a simple blog and a corresponding script to change the background of the last element in every unordered list.

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Lots of post text. Lots of post text. Lots of post text. text. Lots of post text. Lots of post text.

Even when the scripting does not have such pronounced differences, the impact can make itself quite clear in full-scale client-side applications. When the script suddenly works with hundreds (or even thousands) of elements, IE especially will have a considerable performance hit. Even taking away performance considerations for a moment, the second select() definition has greater complexity to it, and, as such, has more chances of breaking; in addition, it takes more work to change its behavior when necessary.

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