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ASP.NET AJAX client components
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The good news is that you can develop client controls associated with complex markup code. The trick is easy: You embed the markup in a container element (for example, a div or a span element), and you use the container as the associated element of the client control. Then, you access the child elements in the control. To clarify this concept, the following section explains how you can create a client control that relies on multiple DOM elements to implement a photo gallery.
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Creating a PhotoGallery control
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The goal of the following example is to show you how to build a client control with a complex UI. By complex, we mean the UI can consist of as many elements as you need, although you ll use only a few in order to keep things simple. The result of the work will be a dynamic photo gallery control that you can use to browse a set of photos saved on the website. The URLs of the photos are stored in an array passed to the control. Figure 8.10 shows the result. The block of static HTML that you use for the PhotoGallery control is contained in a div element. As you can see by lookFigure 8.10 A simple photo gallery control ing at the code in listing 8.11, the UI is reprealized by associating a client control to a resented by two buttons used for portion of structured markup code. browsing the previous or next photo in the sequence and an img element with an ID of gal_image that displays the current photo. A second img element gal_progress displays an indicator during the loading of the next photo.
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Listing 8.11 HTML code for the UI of the PhotoGallery control
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<div id="photoGallery"> <div> <input type="button" id="gal_prevButton" value="Prev" /> <input type="button" id="gal_nextButton" value="Next" /> <img id="gal_progress" src="Images/progress.gif" alt="" style="visibility:hidden" /> </div>
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<div> <img src="Images/placeholder.png" id="gal_image" alt="" /> </div> </div>
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For simplicity, the HTML code doesn t take into account the control s style, which is available in the code you can download from the Manning website at http:// www.manning.com/gallo. Let s examine the code for the client control. Because you want to develop a custom client control, you create a class called Samples.PhotoGallery that inherits from the base Sys.UI.Control class. To help you better understand what s going on, we ve split the code into two listings. The first contains the code for the constructor and the call to the registerClass method. The second shows the code for the prototype object of the Samples.PhotoGallery class. You must merge the two listings to obtain the complete code for the PhotoGallery control. Let s start by exploring the code in the constructor, shown in listing 8.12.
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Listing 8.12 Code for the PhotoGallery class s constructor
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Type.registerNamespace('Samples'); Samples.PhotoGallery = function(element) { Samples.PhotoGallery.initializeBase(this, [element]); this._imageElement = null; this._nextElement = null; this._prevElement = null; this._progressElement = null; this._images = []; this._index = -1; this._imgPreload = null; } Samples.ImageGallery.registerClass('Samples.PhotoGallery', Sys.UI.Control);
The constructor, as usual, contains the class fields. The first four fields, whose names end with the word Element, hold references to the child nodes of the associated DOM element. Although the containing div element becomes the associated element of the PhotoGallery control, the child elements that you need to access are stored in some of the control s fields. The _images array holds the URLs of the photos to display, and the _index variable keeps track of the index of the URL in the array. Finally, _imgPreload
ASP.NET AJAX client components
holds a dynamic img element that is responsible for loading the next photo while the current one is still displayed. As you ll see in chapter 10, this lets you play cool transitions between photos in the sequence. The prototype object of the PhotoGallery control contains all the logic needed to load and browse the photos; see listing 8.13.
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