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By Dave Crane

Книга Ajax - Ajax In motion Ajax - Ajax In ActionКниги Java Script Автор: Dave Crane, Eric Pascarello, and Darren James Год издания: 2006 Формат: pdf Издат.:Manning courses Co. Страниц: 681 Размер: 6,32 Язык: Английский0 (голосов: zero) Оценка:AJAX (расшифровывается как Асинхронный JavaScript и XML) представляет собой набор принципов и техник для создания интерактивных web-приложений. Сам термин AJAX был введен в обращение Джеймсом Гаретом и с тех пор стал использоваться повсеместно. Несмотря на то, что технологии, позволяющие создавать интерактивные Web-приложения, были доступны с 2000 года, широкое распространение они получили только сейчас, во многом благодаря успеху таких Web-проектов как Google Maps, GMail, Flickr. За прошедший год AJAX техники приобрели большую популярность, появилось множество библиотек для написания AJAX приложений, производители средств разработки вовсю кричат о “поддержке AJAX” в своих продуктах.

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Think of Ajax as a rehabilitation center for this misunderstood, ill-behaved child of the browser wars. By providing some guidance and a framework within which to operate, we can turn JavaScript into a helpful model citizen of the Internet, capable of enhancing the real usability of a web application—and without enraging the user or trashing the browser in the process. Mature, well-understood tools are available to help us do this. Design patterns are one such tool that we make frequent use of in our work and will refer to frequently in this book.

As the application continues to be used, cumulative traffic (C) increases. com> The four defining principles of Ajax 21 look at the pros and cons of each in detail in chapter 5. Suffice it to say for now that any one of these formats will be much smaller than the mish-mash returned by the classic web application. In an Ajax application, the traffic is heavily front-loaded, with a large and complex client being delivered in a single burst when the user logs in. Subsequent communications with the server are far more efficient, however.

Furthermore, the unreliability of the network (and hence the need to resend lost packets of information) makes this inefficiency variable and hard to predict. The responsiveness of the memory bus on your local machine is not only better but also very well defined in comparison. But what does that have to do with usability? Quite a lot, as it turns out. A successful computer UI does need to mimic our expectations of the real world at the very basic level. One of the most basic ground rules for interaction is that when we push, prod, or poke at something, it responds immediately.

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