Adding dynamic XAML using managed JavaScript in .NET

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Adding dynamic XAML using managed JavaScript
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You can use managed JavaScript code to dynamically add XAML objects that are rendered to the browser in the Silverlight application. This is one of the most powerful features of the DLR because it allows you to employ the strengths of the scripting language to create a content-rich interface for the user. One of the biggest strengths of the DLR is that almost every Silverlight object has a constructor. You can use that constructor rather than having to use CreateFromXaml() or a XamlReader to build XAML objects. To create an XAML object in managed JavaScript, simply call the constructor function. For example, to create a Canvas and a TextBlock object, use the following managed JavaScript code:
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c = new Canvas() t = new TextBlock()
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After you create the object, you can modify its properties using standard dot syntax. For example, to set the size of a Canvas object, use the following managed JavaScript code:
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c = new Canvas() c.Height = 50 c.Width = 200
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As with .NET programming, you cannot use string values for properties such as the Source property of an Image control or the Margin property of a StackPanel control. To set those values, you need to use the appropriate object from the CLR library.
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Programming Silverlight Applications
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For example, the following managed JavaScript code creates a SolidColorBrush object to set the Foreground color of a TextBlock:
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xaml.titleBlock.Foreground = new SolidColorBrush(Colors.Red)
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At times you may still want to use an XAML reader to generate an XAML DOM from a well-formed XAML string. To do this you can use the Load function of an XamlReader object to generate the XAML from a string. For example, the following managed JavaScript code creates an XAML DOM with the root object being a Canvas:
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myXaml = XamlReader.Load( <Canvas xmlns= Width= 200 Height= 200 Background= Blue Canvas.Top= %d Canvas.Left= %d > <TextBlock Text= %s Canvas.Top= 10 Canvas.Left= 15 Text= SomeText /> </Canvas>
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The XAML text needs to be well formed and must include an xmnls property, typically xmlns= , for Silverlight to be able to generate the XAML DOM.
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Example of a managed JavaScript Silverlight application
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The code in Listing 11.11 contains managed JavaScript code that implements all of the techniques that have been discussed in this section. The full managed JavaScript Silverlight application comprises the Web page in Listing 11.1, the XAML in Listing 11.9, the manifest in Listing 11.10, as well as the JavaScript code in Listing 11.11.
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Example app.jsx File for a Managed JavaScript Silverlight Application
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Import( System.Windows.Application ); Import( System.Windows.Controls.UserControl ); xaml = Application.Current.LoadRootVisual(new UserControl(), app.xaml ) xaml.titleBlock.Text = JavaScript Image Zoom xaml.zoomOut.Click += unZoom xaml.zoomIn.Click += doZoom xaml.zoomInMore.Click += bigZoom function unZoom (sender, args) {
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xaml.xFactor.Value = 1 xaml.yFactor.Value = 1 xaml.zoomImage.Begin() sender.Content = Clicked } function doZoom (sender, args) { xaml.xFactor.Value = 5 xaml.yFactor.Value = 5 xaml.zoomImage.Begin() sender.Content = Clicked } function bigZoom (sender, args) { xaml.xFactor.Value = 10 xaml.yFactor.Value = 10 xaml.zoomImage.Begin() sender.Content = Clicked }
The XAML code in Listing 11.9 defines Button controls named zoomOut, zoomIn, and zoomInMore. It also defines a TextBlock control named titleBlock and a StoryBoard control named zoomImage. The code in Listing 11.11 accesses these elements to implement event handlers that control zooming an image. The code first imports the necessary namespaces required by the application using Import statements. To access the Silverlight XAML, the managed JavaScript code uses the Application. Current.LoadRootVisual() function to get the UserControl control from the app.xaml file using the following line of code:
xaml = Application.Current.LoadRootVisual(new UserControl(), app.xaml )
Using the UserControl object xaml, the code is then able to set the Text property of the titleBlock control using the following line of code:
xaml.titleBlock.Text = JavaScript Image Zoom
The code in Listing 11.11 then implements a Click event handler for each button using the following code: