TAILIEUCHUNG - Beginning Ajax with ASP.NET- P3

Beginning Ajax with P3:Thank you for purchasing Beginning Ajax with . We know that you have a lot of options when selecting a programming book and are glad that you have chosen ours. We’re sure you will be pleased with the relevant content and high quality you have come to expect from the Wrox Press line of books. | Chapter 1 What Is Ajax So into this development environment comes a set of technologies that are collectively referred to as Ajax. If you are an old guy developer like us then Ajax represents a similar concept to the clientserver development we mentioned earlier in the chapter. With client-server development the amount of data transferred is minimized over a terminal application by transferring only the necessary data back and forth. Similarly with Ajax only the necessary data is transferred back and forth between the client and the web server. This minimizes the network utilization and processing on the client. Figure 1-3 shows that typically Ajax operates with the assistance of some type of proxy. Figure 1-3 Advantages of Ajax The advantages of Ajax over classical web based applications are Asynchronous Ajax allows for the ability to make asynchronous calls to a web server. This allows the client browser to avoid waiting for all data to arrive before allowing the user to act once more. Minimal data transfer By not performing a full postback and sending all form data to the server the network utilization is minimized and quicker operations occur. In sites and locations with restricted pipes for data transfer this can greatly improve network performance. Limited processing on the server With the fact that only the necessary data is sent to the server the server is not required to process all form elements. By sending only the necessary data there is limited processing on the server. There is no need to process all form elements process the viewstate send images back to the client and no need to send a full page back to the client. 6 Introduction to Ajax on ASP NET Responsiveness Because Ajax applications are asynchronous on the client they are perceived to be very responsive. Context With a full postback the user may lose the context of where they are. The user may be at the bottom of a page hit the Submit button and be redirected back to the top of the page. With

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