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

By Shawn M. Lauriat

“I a great deal loved how this ebook covers the total Ajax program lifecycle and never purely coding ideas. someone who's trying to develop into a certified front-end developer will savour the architectural perception and top practices brought through this book.”  — Andi Gutmans, Co-Founder & Co-Chief know-how Officer of Zend applied sciences   Mission-Critical Ajax: Maximizing Scalability, functionality, safeguard, Reliability, and Maintainability   complicated Ajax: structure and top Practices is the definitive advisor to construction business-critical, production-quality net purposes with Ajax. Shawn M. Lauriat systematically addresses the layout, structure, and improvement matters linked to Ajax, supplying confirmed styles and powerful code examples to be had in no different publication. You’ll locate top practices for addressing the whole spectrum of matters company Ajax builders face: scalability, functionality, protection, reliability, flexibility, maintainability, and reusability.   Writing for skilled net builders, Lauriat gives you clean rules and chic suggestions: meaty technical content material, provided with unparalleled readability. one of several issues he covers in exceptional intensity: cleanly enforcing JavaScript customized occasions to lessen coupling and to reinforce flexibility; overcoming Ajax’s conventional accessibility obstacles; decreasing community latency via compression and different recommendations; and lots more and plenty extra. insurance comprises  making plans Ajax interfaces for simplicity, readability, and intuitiveness growing scalable, maintainable architectures for client-side JavaScript utilizing the newest instruments to profile, validate, and debug client-side code Architecting the server aspect for safeguard and performance, whereas proscribing loaded information, items, and activities to present requests holding opposed to the main frequent and critical Ajax safety dangers Optimizing each part of an Ajax program, from server-side scripts to database interactions Introducing state of the art Ajax: online game improvement, Ajax with canvas, and Ajax for company functions in regards to the site This book’s spouse website (http://advancedajax.frozen-o.com) doesn’t simply offer all of the code: It exhibits code examples in motion, as construction blocks of a true internet program interface.

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Bullet, Link: Yet Another Item. ” This gives much more metadata about the list of links on the page to the user. The screen reader announces “Important Items” as a heading with a particular level, informing the user as to the section’s relationship to the document as a whole. In addition, screen readers (and some browsers and browser extensions) allow the user to navigate around the page by jumping from header to header, using the header levels to structure the page hierarchically. This increases the flexibility of a spoken page, giving control over the content read to the user, and reduces the time spent waiting to reach a given place in the page.

Using it means using the available markup as designed in its specification, rather than using generic markup that then emulates the descriptive tags. 1 More Accessible The accessibility of semantic markup goes up drastically when compared to a massive collection of nested div and span tags. When screen readers read the page to the user, the two following examples read very differently, regardless of how similar a style they have: Because table layouts have dropped quite far down on the map as far as respectable markup goes, this chapter will not cover the benefits of anything over table-based layouts, especially nested table layouts.

An increasing amount of users take advantage of tools such as the NoScript (www. net) Firefox extension to white-list sites the browser will allow to run JavaScript. This greatly increases the likelihood of users seeing how your Ajax-driven web application behaves without any scripting at all, let alone the XMLHttpRequest object. 38 Chapter 1 Usability JavaScript may also die on a page if the user happens to stumble across a bug resulting in a JavaScript error or exception, which should not keep the page from working via traditional page loads.

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