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WebForm_DoCallback( '__Page', arg, ClientCallbackHandler, context, ClientErrorHandler, false)
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This string equates to the JavaScript that is required to invoke a special ASP.NET JavaScript method named WebForm_DoCallback, which then manages the asynchronous callback to our page behind the scenes. As you can see, the values passed to that special method will be the same as the values we pass into our AddDays function. So there are some useful abstractions going on here making our lives much simpler. First, the WebForm_DoCallback abstracts away the difficulty of invoking the asynchronous JavaScript call; but secondly, the ClientScript.GetCallbackEventReference method abstracts the complexity of producing that string in the first place. At this point we can run the test page and click the button a few times to see that the Result label is updated, even though the Date Created time shown at the top of the page does not change at all. Having achieved our desired outcome of refreshing only the part of the page that is changing, we ve saved users from twiddling their thumbs during a full-page postback. In the grand scheme of things, updating the value of a label based on some arbitrary page event such as a button click rates as pretty minor. When faced with real application problems, we often find that working with client-side JavaScript can become extremely complex because the tools for working with JavaScript are not as advanced as the tools we have for working with pure .NET code. For example, we don t get Intellisense help when working with objects in JavaScript, and the debugging experience is far short of the experience we have when debugging native .NET code such as C#. So there s a problem here. We have growing demand for Ajax-style web pages but the cost of producing this sort of page is much higher because of the added complexity. Thankfully the ASP.NET team has again come to the fore with a new set of extensions to ASP.NET, codenamed Atlas. It s these Atlas extensions to ASP.NET that will bring Ajax-style application development within reach of all developers. 10.4.2 Announcing Atlas When Microsoft introduced Atlas to the world at the PDC conference in Los Angeles in November 2005, it was warmly received by the development community. Up until that time there had been several third-party and open-source solutions for simplifying the task of creating Ajax-style applications in ASP.NET, but no clear standards had emerged. The announcement of Atlas would mean that ASP.NET developers could develop Ajax applications on top of a standard platform that would evolve and grow with the ASP.NET product, and that it would also receive the same level of tooling support as other ASP.NET controls within the Visual Studio IDE. In March 2006 Microsoft released the first publicly available version of Atlas that comes with a GoLive license which means developers can use that version to create applications they plan to deploy. This version of Atlas comes as a standalone assembly file which has a
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INTO THE FUTURE
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version number of 2.0.50727 and was made available at the newly created Atlas developer center, http://atlas.asp.net. So what kinds of problems does Atlas solve for us Let s look at a typical Ajax scenario and then look at how we d solve it using Atlas. 10.4.3 Using Atlas In web applications, people often search for a particular item and then display further details about it. As an example, consider a product inventory application where a user would search for a product. In such an application the user might drill into the product information by first locating a category Figure 10.3 This sample uses and then choosing the product from a list of prod- Ajax to populate an auto-complete ucts within that category. Figure 10.3 shows us a list from a web service based on text that a user has entered into simple example of this type of behavior. the text box. In figure 10.3 the user can type the name of a category into a textbox and then press the Get Products button to have the products for that category retrieved and displayed. Notice that beneath the textbox, Intellisense help is displayed to the user about the categories available based upon the characters that the user has already typed. This filtering behavior, known as auto-completion is a feature that clients ask for regularly when they want to present users with a large list of items and have them locate an item within that list. The term auto-completion comes from the way that the behavior automatically provides a list based on the characters that have been entered. This is a useful way to find words because a user can type his way through a list of words until there is only one word remaining. Using Atlas we ll learn how to implement the auto-complete Intellisense items by calling a web service without needing to postback, and we ll do the same for the products that are displayed. We ll display those when the user clicks the Get Products button without requiring a postback either. Let s get started
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