Ajax in Practice by Dave Crane

By Dave Crane

Ajax in perform presents example-rich assurance of Ajax filled with ready-to-use code and useful recipes for universal and not-so-common initiatives. Ajax builders now face the flow from Ajax-as-theory to Ajax-in-practice. Ajax in perform courses net builders during the transition from studying approximately Ajax to effectively making use of Ajax-driven ideas in real-world improvement situations. Ajax supplies internet builders the aptitude to create wealthy user-centered net functions. yet Ajax additionally provides a brand new point of complexity and class to these functions. Ajax in perform tackles Ajax head-on, delivering numerous hands-on concepts and a whole bunch reusable code to handle the explicit matters builders face while development Ajax-driven recommendations. After a quick evaluation of Ajax, this booklet takes the reader via dozens of operating examples, all offered in an easy-to-use cookbook structure. Readers will find out how to enforce drag-and-drop interfaces and should realize find out how to create potent nagigation recommendations for his or her functions. in contrast to a conventional cookbook, although, Ajax in perform offers a radical dialogue of every method provided and exhibits how the person parts might be hooked up to create robust suggestions. A enjoyable "mash-up" bankruptcy concludes the e-book. all through Ajax in perform, the examples selected are fascinating, enjoyable, and functional.

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Extra resources for Ajax in Practice

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In the pre-Ajax architecture, pictured on the left, all the action is taking place on the server, with the browser acting as a dumb terminal, accepting predigested HTML content. The middle column illustrates the impact of introducing some relatively simple Ajax into the application. Let’s say that the server still controls all aspects of the workflow, but hyperlinks and forms now request fragments of HTML content that are used to update parts of the screen, rather than perform a full refresh. Server responses are fielded by JavaScript code, which reads the response and rearranges the DOM accordingly.

The request is now on its way to the server, and there’s nothing more for the client code to do until the response comes back. We’ll address that issue in the next section. 4 Processing the response We’ve fired the request at the server, and we can assume for now that the server will do its job and return a response to us. 4, the next thing that we need to do is to receive the response when it comes in and unpack it. In the previous section, we already made preparations for this moment, by assigning a callback handler function to our XHR object.

From a business perspective, the importance of this cannot be understated. Ajax has opened up a large new market to browser-based line-of-business apps, disrupting not only web development, but the world of thick clients and desktop apps in the process. Within the enterprise, adoption of Ajax-based solutions is considerable. On the public Internet, several heavyweight Ajax-based office suites have been developed in the last year, and web-based operating systems are under development. Although none of these have yet gone mainstream, progress has been considerable.

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