By Dave Crane
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There is another, more mundane, reason for the title of this book: our readers are busy. They use books to do a job or to solve a problem. They need books that allow them to jump in and jump out easily and learn just what they want just when they want it. ” The books in this series are designed for such readers. com> xxx ABOUT THIS BOOK About the cover illustration The figure on the cover of Ajax in Action is a “Sultana,” a female member of a sultan’s family; both his wife and his mother could be addressed by that name.
The client/server and related n-tier architectures are essential for collaborative or centrally coordinated applications, but they raise the specter of network latency, with its ability to break the spell of user productivity. Although a generalpurpose solution to the conflict between the two exists in asynchronous remote event handling, the traditional request-response model of the classic web application is ill suited to benefit from it. We’ve set a goal for ourselves, and for Ajax, in this chapter of delivering usable sovereign applications through a web browser, thereby satisfying the goals of user productivity, networking, and effortless, centralized maintenance of an application all at once.
Building a rich client interface is a bit more complicated than designing a web page. What is the incentive, then, for going this extra mile? What’s the payoff? What is a rich client, anyway? Two key features characterize a rich client: it’s rich, and it’s a client. Let me explain a little more. Rich refers here to the interaction model of the client. A rich user interaction model is one that can support a variety of input methods and that responds intuitively and in a timely fashion. We could set a rather unambitious yardstick for this by saying that for user interaction to be rich, it must be as good as the current generation of desktop applications, such as word processors and spreadsheets.