Download Advanced Ajax: Architectureand Best Practices by Shawn M. Lauriat PDF

By Shawn M. Lauriat

Mission-Critical Ajax: Maximizing Scalability, functionality, defense, Reliability, and MaintainabilityAdvanced Ajax: structure and most sensible Practices is the definitive consultant to construction business-critical, production-quality internet purposes with Ajax. Shawn M. Lauriat systematically addresses the layout, structure, and improvement matters linked to Ajax, providing confirmed styles and strong code examples on hand in no different e-book. you will find most sensible practices for addressing the complete spectrum of matters company Ajax builders face: scalability, functionality, safeguard, reliability, flexibility, maintainability, and reusability. Writing for knowledgeable net builders, Lauriat gives you clean rules and stylish recommendations: meaty technical content material, provided with unprecedented readability. one of the subject matters he covers in exceptional intensity: cleanly imposing JavaScript customized occasions to minimize coupling and to augment flexibility; overcoming Ajax's conventional accessibility obstacles; lowering community latency via compression and different options; and lots more and plenty more.COVERAGE contains• 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 safety and performance, whereas limiting loaded info, items, and activities to present requests• keeping opposed to the main common and demanding Ajax protection hazards• Optimizing each portion of an Ajax program, from server-sidescripts to database interactions• Introducing state-of-the-art Ajax: video game improvement, Ajax with SVG, and Ajax for cellular units"

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The example on server-side validation in the last section touched on user expectations when working with the user registration form. Users don’t expect communication with the server in any form unless one of the following is true: • The user initiates the action—This comes in the form of clicking a mouse button, hitting the Enter or Return key, ending a drag-and-drop action, or performing some other definitive event to indicate an expected response from the server. • The action taken does not take the user out of context and happens in seamless integration with the current interface—Auto-saving drafts falls into this category, along with streaming requests such as an RSS ticker.

The use of the thead, tbody, and tfoot tags, each with their corresponding tr collections of th tags or td tags (in the case of tbody), gives a semantic foothold for scripting and styles. The caption tag, which appears just after the opening table tag, gives exactly what it describes; allowing the titling of a table without losing the semantic coherence of an external, adjacent div. Thus, the caption tag gives context to the table headings about to get read out to the user. By adding a summary attribute to the table when appropriate, users with screen readers will have an even better idea of what the table has organized before they get lost in the sea of table cells.

Mozilla has much better DOM support, but the margins don’t quite match. Opera has almost everything correct, though it still lacks control over the character spacing and dimensions. Safari has support for current drafts of a few CSS3 properties and much more precise control over character spacing, kerning, and margins. 13 An increasing amount of accurate support. 13 shows an increasing amount of accurate support. ) Coding CSS and JavaScript unobtrusively not only makes it easier for the interface to degrade gracefully, but also it encourages clearer lines between interface structure, design, and behavior.

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