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Introducing ASP.NET AJAX
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Ajax has revolutionized the way users interact with web pages. Gone are the days of frustrating page refreshes, losing your scroll position on a page, and working in the redraw-refresh paradigm of traditional web applications. In its place is the next generation of web applications: Ajax applications, whose characteristics include smoother page updates; continuous, fluid interaction; and visually appealing, rich interfaces. The term Ajax, which stands for Asynchronous JavaScript and XML, was coined to describe this new approach to web development. Although most users aren t familiar with the acronym, they re certainly familiar with its benefits. Sites like Google Maps, Live.com, and Flickr are just a few examples of recent applications that are leading the way through this new frontier. Each of them offers slightly different services, but all share the same goal: to provide a rich user experience that is personalized, engaging, and supported across all major browsers. Unfortunately, using these next-generation web applications is far more trivial than authoring them. Ajax applications require a different approach to thinking about web solutions. This paradigm shift requires more discipline and knowledge of client-side scripting along with the conscious decision to deliver a smarter and more intuitive application to the browser. In addition, although it s been around for a while, Ajax is still relatively new to web developers, and techniques for patterns, guidelines, and best practices are still being discovered and refined. To assist in this transition, the Microsoft ASP.NET AJAX framework encapsulates a rich set of controls, scripts, and resources that empowers you to more easily craft the next generation of web applications. The goal in this introductory chapter is to get you started on developing applications with the ASP.NET AJAX framework. To whet your appetite, we ll go through a whirlwind tour of the most basic and commonly used components and follow up with a few quick examples that demonstrate their use. Subsequent chapters examine each of these components in more detail and reveal how things work under the hood. But before you can discover the ASP.NET AJAX framework, you must first understand what Ajax is and how we got here.
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Ajax is an approach or pattern to web development that uses client-side scripting to exchange data with a web server. This approach enables pages to be updated dynamically without causing a full page refresh to occur (the dream, we presume, of every web developer). As a result, the interaction between the user and the application is uninterrupted and remains continuous and fluid. Some consider this approach to be a technology rather than a pattern. Instead, it s a combination of related technologies used together in a creative way.
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The result of bringing these technologies together is nothing new. Techniques for asynchronous loading of content on the Web can be dated as far back as Internet Explorer 3 (also known as the Jurassic years of web development) with the introduction of the IFRAME element. Shortly after, the release of Internet Explorer 5 introduced the XMLHttpRequest ActiveX object, which made possible the exchange of data between the client and server through web browser scripting languages.
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Some credit remote scripting as the precursor to Ajax development. Prior to the XMLHttpRequest object, remote scripting allowed scripts running in a browser to exchange information with a server. For more about remote scripting, read http://en.wikipedia.org/wiki/Remote_Scripting.
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Even with the release of the XMLHttpRequest object, and with applications like Outlook Web Access taking advantage of these techniques, it wasn t until the release of Google Maps that Ajax was noticed by the masses. You now have a high-level understanding of Ajax and how it came to be, but we haven t discussed the technologies that make up the pattern or how the ASP.NET AJAX framework fits into the picture. It s important that we spend a little more time fully explaining how Ajax works and discussing the technologies that form it.
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