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The AJAX Revolution
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Like it or not, the Web is changing, and this time it is changing for developers and architects. In the evolution of software, we first observe a spark of genius triggering an innovative process and the teaching of new tricks and new ways of doing things. In this case, it was the spark of AJAX and the need to build effective and rich user experiences. Next, developers
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1 ASP.NET Web Forms Today
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start generalizing and abstracting things to make them reusable and easy to replicate repeatedly in a variety of scenarios. When this happens, we have a paradigm shift. Today we are moving away from many of the ideas and pillars of Web Forms. It s not a process that has a well-known and defined completion date yet, but nobody doubts that such a day is in our near future. The spark of AJAX was just the realization that we can place out-of-band requests, bypass the classic browser machinery, and gain total control of the request and subsequent response. Is this just a little, geeky detail Maybe, but this little detail triggered a huge transformational process an entire paradigm shift whose results will be clear and definitive only in a few years. That s my guess, at least. Let s briefly consider what paradigm shifts are and what they mean (and have meant) to humans throughout history.
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As drastic as it might sound, the Web revolutionized the concept of an application. Now AJAX is revolutionizing the concept of a Web application. The Web will always remain separate from the desktop, but Web applications are going to enter a new age.
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What s a Paradigm Shift
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According to Wikipedia, a paradigm shift describes a change in most of the basic assumptions within the ruling theory of a science. The shift creates a break and clearly contrasts with the current ideas and approaches. A paradigm shift is a long process that begins naturally when enough significant limitations and anomalies have been found within the current state of the art in a discipline. At this point, new ideas are tried often ideas that were considered years before and then discarded. The community proceeds by trial and error, experimenting and trying to come to general conclusions. Inevitably, a paradigm shift puts the discipline into a state of crisis. (This is the term used by Thomas Kuhn, who coined the term paradigm shift and formalized these concepts.) The state of crisis manifests itself through a number of attempts to change, each presented as possibly definitive but that hardly work for everybody, at least in the original form. The impact of a paradigm shift is particularly deep in areas that appear to be stable and mature. A great example of a paradigm shift is the changes in physics at the beginning of the twentieth century. Before the advent of Einstein s theory of relativity, physics was unanimously considered to be a largely worked-out system. The theory of relativity he formulated in 1905 changed everything in the field, but it was only about three decades later that the process of redefining the fundamentals of physics was completed. For more information, pay a visit to http://en.wikipedia.org/wiki/Paradigm_shift. It s definitely illuminating reading.
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Part I The ASP.NET Runtime Environment
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So now, how does this apply to ASP.NET and AJAX
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The AJAX Paradigm Shift
Even though we tend to date the advent of AJAX around the 2004, one of the core tools of AJAX the XmlHttpRequest object is much older. In the late 1990s, we already had all the technologies we are using today to set up AJAX solutions. For a number of reasons, the idea of using JavaScript, the HTML DOM, and the XmlHttpRequest object to update pages asynchronously was discarded for most applications, even though Outlook Web Access and a number of niche applications continued using it. It was tried again in the early 2000s, and this time it really stuck. Like physics in the early twentieth century, ASP.NET Web Forms was a stable and mature platform when AJAX experiments started. In the beginning, it was simply a matter of spicing up some pages with a piece of JavaScript code and downloading raw data from an HTTP endpoint. However, it is one thing to download a number or a string and refresh the small portion of the user interface that contains it, but it s quite another to download a collection of data objects to repopulate a grid. And what if you intend to post the content of a form and then update a large section of the current view The underlying machinery and tools remain the same, but the way in which they are organized, exposed to developers, and consumed requires a lot of thinking and perhaps a brand new application model. In particular, the advent of AJAX raised the need for developers to embed more JavaScript code in HTML pages. The JavaScript code, however, has to deal with HTML DOM elements, each of which is commonly identified with a unique ID. In an ASP.NET Web Forms application, it s the set of server controls defined in a page that ultimately determines the structure of the HTML DOM and the ID of the constituent elements. To support AJAX deeply and effectively, Web Forms developers have to dig out some of the internal details of the server control black boxes. In doing so, developers attack one of the pillars of the Web Forms model. The more AJAX you want, the more control you need over HTML; the more control over HTML you want, the more you are mining the foundation of ASP.NET Web Forms. But there s more than just this.
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