11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit in .NET

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11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit
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Listing 114 ImageRotatorExtender Class
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[assembly:SystemWebUIWebResource("ImageRotatorImageRotatorBehaviorjs", "text/javascript")] namespace ImageRotator { [ParseChildren(true, "ImageList")] [Designer(typeof(ImageRotatorDesigner))] [ClientScriptResource("ImageRotatorImageRotatorBehavior", "ImageRotatorImageRotatorBehaviorjs")] [RequiredScript(typeof(TimerScript))] [TargetControlType(typeof(Image))] public class ImageRotatorExtender : ExtenderControlBase { [ExtenderControlProperty] [ClientPropertyName("rotationInterval")] [DefaultValue(3), DisplayName("RotationInterval(seconds))")] [DesignerSerializationVisibility( DesignerSerializationVisibilityVisible)] public int RotationInterval { get { return GetPropertyValue<int>("RotationInterval", 3); } set { SetPropertyValue<int>("RotationInterval", value); } } private ImageUrlList _imageList; [ExtenderControlProperty] [ClientPropertyName("imageList")] [DesignerSerializationVisibility( DesignerSerializationVisibilityContent)] [PersistenceMode(PersistenceModeInnerDefaultProperty)] public ImageUrlList ImageList { get { if (_imageList == null) { _imageList = GetPropertyValue<ImageUrlList>( "ImageList", null); if (_imageList == null) { _imageList = new ImageUrlList(); SetPropertyValue<ImageUrlList>( "ImageList", _imageList); } } return _imageList; } } } }
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Adding Client-Side Behavior Using the ExtenderControlBase
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Creating the AjaxControlToolkitBehaviorBase Class The ASPNET AJAX Control Toolkit comes with its own version of the SysUIBehavior class, which provides additional functionality and supports the development pattern the toolkit is designed to work with The AjaxControlToolkitBehaviorBase class provides inheritor support for working with client state and interacting with the asynchronous request events of the SysWebFormsPageRequestManager The support for working with client state is provided by the get_ClientState and set_ClientState methods that can be used to work with the string-based hidden eld associated with your extender The class also provides two methods tied to the beginRequest and endRequest events of the PageRequestManager, which can be overridden to provide speci c functionality in your behavior in situations where an UpdatePanel is being used The ImageRotatorBehavior class shown in Listing 115 inherits from the BehaviorBase class and provides the client-side behavior for our extender control The structure of this class is exactly the same as in 5, with the rotationInterval property used to set the interval at which the images will be swapped out and the imageList property containing an array of the images The one change to the class is in the use of the SysTimer class, which is part of the ASPNET AJAX Control Toolkit This class, which is contained in the Compat/Timer folder, wraps the windowsetInterval call, providing a cleaner interface for this timer-speci c functionality The SysTimer class is just one of many that come with the toolkit that provide added functionality to the existing Microsoft AJAX Library If you look in the Compat and Common folders in the toolkit library project, you will nd classes for working with dates, drag and drop, and threading, just to name a few
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Listing 115 ImageRotator Behavior Class
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TyperegisterNamespace('ImageRotator'); ImageRotatorImageRotatorBehavior = function(element) { ImageRotatorImageRotatorBehaviorinitializeBase(this, [element]); this_imageIndex = 0; this_imageList = new Array(); this_rotationInterval = null; this_timer = null;
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11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit
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Listing 115 continued
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} ImageRotatorImageRotatorBehaviorprototype = { initialize : function() { ImageRotatorImageRotatorBehaviorcallBaseMethod(this, 'initialize'); var element = thisget_element(); if(this_imageList) { this_imageList = SysSerializationJavaScriptSerializerdeserialize( this_imageList); this_imageList[this_imageListlength] = elementsrc; } if(this_rotationInterval == null) this_rotationInterval = 3; if(this_timer == null) this_timer = new SysTimer(); this_timerset_interval(this_rotationInterval * 1000); this_timeradd_tick(FunctioncreateDelegate(this, this_rotateImage)); this_timerset_enabled(true); }, dispose : function() { ImageRotatorImageRotatorBehaviorcallBaseMethod(this, 'dispose'); if (this_timer) { this_timerdispose(); this_timer = null; } this_imageList = null; }, get_rotationInterval: function(){ return this_rotationInterval; }, set_rotationInterval: function(value){ this_rotationInterval = value; }, get_imageList: function(){ return this_imageList; },
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Adding Client-Side Behavior Using the ExtenderControlBase
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set_imageList: function(value){ this_imageList = value; }, _rotateImage: function(){ var element = thisget_element(); if(element) { elementsrc = this_imageList[this_imageIndex++]; if(this_imageIndex > this_imageListlength - 1) this_imageIndex = 0; } } } ImageRotatorImageRotatorBehaviorregisterClass( 'ImageRotatorImageRotatorBehavior', AjaxControlToolkitBehaviorBase);
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Attaching the Extender to a Control You can attach the ImageRotator extender to an image control by using the new Extender Control Wizard (see Figure 113) that comes with Visual Studio 2008 and thus provide the same design-time experience we saw in 5 The wizard is available from the smart tag of the image control by selecting the Add Extender option, which opens the wizard The wizard enables the user to select an extender control from a list and associate it with a control In our case, we would select the ImageRotator extender to associate it with the image control After we do that, we add values to the RotationInterval property and ImageList property using the Properties window of the image control Final Thoughts If we compare our experience of creating extender controls using the ASPNET AJAX Control Toolkit to using the classes provided by the ASPNET 20 AJAX Extensions, we can see that our development experience is much simpler The use of attributes to register our properties to be included in the $create statements and to register our associated script les dramatically reduces the complexity of our code compared to implementing logic in the GetScriptDescriptors and GetScriptReferences methods This convenience alone makes it worth using the toolkit, but if we tack on the added design-time features, support for working with client state, and the numerous added JavaScript les such as the SysTimer class, the
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