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itself with the ScriptManager (event 2). During this step, the ScriptManager gets a list of script references from the server control. The second step happens during the Render phase, when the Ajax-enabled control provides the ScriptManager with a list of script descriptors (event 4). Finally, the ScriptManager renders in the page both the script tags with the references to the script files and the $create statements generated by the script descriptors. If you re worried by the complexity of this procedure, have no fear. To make things simpler, ASP.NET AJAX provides base classes for creating Ajax-enabled controls. The advantage of deriving from these classes is that they take care of performing the entire registration procedure automatically. Creating an Ajaxenabled control is a matter of implementing the methods that return the list of script descriptors and script references. These methods are defined in the interfaces implemented by the base classes. As a consequence, you have to override them to get the job done. In some situations, it s not possible to derive from a base class, and you need to implement the procedure manually. Later in the chapter, we ll go under the hood of the registration procedure. Now, it s time to introduce the base classes and interfaces that you ll use to create Ajax-enabled controls.

Here are a few pointers about how this customization works: The button bar must always contain four category buttons plus the More button. You cannot add more buttons or remove buttons to display fewer options. You cannot replace More with another button. If you replace a button with an item already in the button bar, the two items simply switch positions. There is no revert to defaults option. The original order is Featured, Most Viewed, Bookmarks, and Search. The items you do not include in the button bar appear as a list when you tap More. You can select them from that list. It s an extra step, but all the options are still available.

The easiest way to get started creating views is to run some temporary views using the Futon interface. For a detailed overview of Futon, see 5 of this book. I have created a database called contacts and populated it with the five records, as shown in in Figure 7-1. This database looks like Figure 7-2 in Futon.

Video information screens provide a detail view for each video. Figure 5-5 shows a typical info screen. Here, you ll find the name of the video, its rating (in stars, from zero to five), the number of times the video has been viewed, its run time, and more. Scroll down the screen to find YouTube s suggestions for related videos.

In the previous section, we mentioned that you can choose between two kinds of Ajax-enabled controls: You can create either an extender or a script control. The difference between these two types of controls is mainly conceptual, because the goal of both is to provide a list of script descriptors and script references. You can think of extenders as providers of client functionality. The goal of an extender is to attach client components to an existing server control at any time, without the need to derive a new class. To understand why you have to bother with extenders, suppose you ve created a client component that adds auto-complete functionality like the one provided by Google Suggest to a text box element. To wire the client component to the text box, you could create an AutoCompleteTextBox class that derives from the TextBox class and provides the necessary script references and script descriptors. Another approach keeps the TextBox class and lets an external object do the work of wiring a client component to the TextBox control. In this scenario, the external object is the extender, and the TextBox becomes the extended control or target control. An extender can upgrade or extend existing server controls to Ajaxenabled controls without the need to replace them with custom server controls. This concept is represented in figure 9.6.

Futon makes it very simple to create temporary views of this data. To the top right of the key/value table, you will see a Select view drop-down box. Currently, All documents should be selected. Choose Temporary view from this list to navigate to the temporary view builder page (Figure 7-3).

Figure 5-5. A video info screen offers information about the video and the option to bookmark the video.