5: Adding Client Capabilitie s to Ser ver Controls in .NET framework

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5: Adding Client Capabilitie s to Ser ver Controls
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class adds the behavior to the Image of switching the image source periodically through an internal list of images
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NOTE
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Detailed Explanation of the Behavior Class
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The makeup of the behavior class was covered in 3, so we concentrate only on the functionality as it relates to our example as we move forward
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The class contains the RotationInterval and ImageList properties that were part of the ScriptBehaviorDescriptor class and an internal _set Rotation method that sets up the behavior to call back into itself using the windowsetInterval method to rotate the image Notice that we are building up the JavaScript expression to be called by the setInterval method This is required due to the source of the this value when calling methods As you recall from 3, the behavior is actually a property of the element itself, so the code builds up a method call directly to the behavior by getting the element id and constructing an expression that calls the rotateImage method, ensuring we have the correct this context as the method is executed Inside the rotateImage method, we access the image element and change to image source, and thus ensure the functionality we need to rotate the images
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Listing 512 ImageRotator SysUIBehavior-based Class
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/// <reference name="MicrosoftAjaxjs"/> TyperegisterNamespace("ImageRotatorExtender"); ImageRotatorExtenderImageRotator = function(element) { ImageRotatorExtenderImageRotatorinitializeBase(this, [element]); this_imageIndex = 0; this_imageList = null; this_rotationInterval = 3; } ImageRotatorExtenderImageRotatorprototype = { initialize: function() { ImageRotatorExtenderImageRotatorcallBaseMethod(this,'initialize'); this_setupRotation();
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Adding Client-Side Behavior Using the ExtenderControl
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}, dispose: function() { ImageRotatorExtenderImageRotatorcallBaseMethod(this, 'dispose'); }, get_rotationInterval: function(){ return this_rotationInterval; }, set_rotationInterval: function(value){ this_rotationInterval = value; }, get_imageList: function(){ return this_imageList; }, set_imageList: function(value){ this_imageList = value; }, _setupRotation: function(){ var expression = "$get('" + thisget_element()id + "')ImageRotator_rotateImage()"; setInterval(expression,thisget_rotationInterval()*1000); }, _rotateImage: function(){ var element = thisget_element(); if(element) { elementsrc = this_imageList[this_imageIndex++]; if(this_imageIndex > this_imageListlength - 1) this_imageIndex = 0; } } } ImageRotatorExtenderImageRotatorregisterClass( 'ImageRotatorExtenderImageRotator', SysUIBehavior); if (typeof(Sys) !== 'undefined') SysApplicationnotifyScriptLoaded();
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Attaching the Extender to a Control
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With the creation of the extender control library completed, it is now time to cover the design-time experience of using our ImageRotator extender control The rst thing we want to talk about is the new Extender Control Wizard, shown in Figure 56, that comes with Visual Studio 2008 The Extender Control Wizard is used to automate the assignment of an extender control to a server control The wizard is used when a page is in design mode and is accessible from the smart tag Extender Wizard option on the controls on a page The wizard displays a list of available extender controls
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5: Adding Client Capabilitie s to Ser ver Controls
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from which you can select and name the extender control before the wizard creates the HTML markup that attaches the extender control to the current control After the extender control has been attached, it is easy to move to the Properties window and ll in the appropriate entries, easily customizing the extender control for any particular situation The HTML markup in Listing 513 shows a con gured ImageRotator extender that was attached to an image control using the Extender Control Wizard, and Figure 57 shows the complete page
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Figure 56 Extender Control Wizard
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Listing 513 Sample Web Page with an Image Control and Associated ImageRotator Control
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<%@ Register assembly="ImageRotatorExtender" namespace="ImageRotatorExtender" tagprefix="cc1" %> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <h3>Pictures of Florence provided by <asp:Image ID="Image2" runat="server"
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Adding Client-Side Functionality Using the ScriptControl
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ImageUrl="~/images/freeDigitalPhotoslogogif" /></h3> <div> <asp:Image ID="Image1" runat="server" ImageUrl="~/images/1jpg" /> <cc1:ImageRotator ID="Image1_ImageRotator" runat="server" ImageList="images/1jpg,images/2jpg,images/3jpg,images/4jpg" TargetControlID="Image1" /> </div>
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Figure 57 ImageRotator sample page
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Adding Client-Side Functionality Using the ScriptControl
The need to add client-side functionality to server controls has been around since the early days of ASPNET and has been accomplished in many ways The combined use of the ClientScriptManager class and the String Builder class to build up dynamic JavaScript code worked, but the inconsistencies among the various browsers led to code that intermittently
5: Adding Client Capabilitie s to Ser ver Controls
worked and was hard to debug ASPNET 20 AJAX Extensions and the Microsoft AJAX Library provide a much better way to add browserindependent client-side functionality to server controls by utilizing the ScriptControl and the SysUIControl classes In this section, we look at how we can create server controls that are built on these frameworks that can provide a browser-independent rich user experience on the client
ScriptControl Overview The ScriptControl class, shown in Figure 58, is an abstract class designed for use by developers who are creating server controls that require clientside functionality If we look back at extender controls, the idea behind them was to add client-side behavior to an already existing server control without modifying that control With the ScriptControl, we are interested in creating a completely contained control that provides a server-side design-time experience with integrated client-side functionality