Ajax: The Complete Reference by Thomas A. Powell

By Thomas A. Powell

The Definitive consultant to Ajax net program Development
Evolve from the click-and-wait programming development to the most recent internet 2.0 paradigm utilizing this entire advisor to Ajax. Written through net improvement professional Thomas Powell, the publication lays out each function of Ajax along precise factors and real-world code examples.
Ajax: the whole Reference explains the way to create and attempt Ajax-enabled net purposes utilizing the XMLHttpRequest item in addition to replacement JavaScript-based conversation mechanisms. you will discover quite a few pattern functions that includes rising user-interface conventions and construct purposes that handle real-world networking and protection matters. a powerful verbal exchange library is built in the course of the booklet that allows you to architect versatile Ajax functions. the most recent applied sciences similar to internet providers, Flash-Ajax integration, client-side templates, Comet, and Offline entry also are coated. become aware of the way forward for internet improvement today!
- paintings with conventional JavaScript conversation methods like iframes
- discover all of the quirks and info within the XMLHttpRequest object
- deal with disparate information codecs, together with XML, JSON, CSV, YAML, and more
- care for networking matters, 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 resembling car recommend, click-to-edit, and drag-and-drop
- remedy troubling Ajax structure difficulties, together with again button, historical past, and bookmarking issues
- research Ajax's function in internet 2.0 and net services
- discover push sort verbal exchange utilizing Comet and Flash
- detect the way forward for offline net software entry and operation

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The answer is no, at least in modern browsers. To prove this to yourself, you can add another parameter to the previous example’s query called delay. This will delay the response by x number of seconds where x is the value of the parameter (for example, delay=5). html, which adds a five-second delay to the request. The rating will take a while to record, but the message indicating the vote will not be delayed and your browser should not lock. Query String Limits Before moving on to the next approach, an important question should come to mind: what is the limit for the data that can be passed via the query string?

Onload = handleResponse; 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 33 Of course, more likely a closure will be used to wrap the function so that variables can be preserved and passed rather than rely on global variables. This style of JavaScript will be seen frequently in Ajax applications. Given that it is possible that the image may not come back properly, it is also important to address error conditions. A simple approach using the image communication technique is to set up a callback in the case of the Image object firing its onerror event.

Significant Emphasis on JavaScript Long underestimated as a significant programming language, with Ajax, JavaScript has finally been recognized as the powerful tool it always has been. Unfortunately, given the past misunderstandings of JavaScript’s capabilities, few developers are actually true experts in the language. While this is changing rapidly, it is common for many new Ajax developers to spend a great deal of time first mastering JavaScript language features such as loose typing, reference types, advanced event handling, DOM methods, and prototype OOP style programming before really dealing with Ajax.

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