Programming Silverlight Applications with JavaScript in .NET

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Programming Silverlight Applications with JavaScript
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FIGURE 9.3 A Silverlight application with a TextBlock and Rectangle that were configured in JavaScript
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Accessing child elements of XAML objects in JavaScript
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Another very valuable attribute that Silverlight adds to XAML objects is the children attribute. The children attribute provides access to a collection of child elements that are attached to the XAML element. Silverlight also provides several properties and functions attached to the children attribute that help in working with the child attributes. Table 9.4 lists the attributes and functions attached to the children attribute.
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TABLE 9.4
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Attributes and Functions of the children Attribute of an XAML Object in JavaScript
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Attribute Description
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add() clear() Count getItem() getValue() insert() name remove() removeAt() setValue()
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Accepts an object as an argument and adds it as a child to the end of the list. Removes all objects from the list. Integer that specifies the number of children in the list. Accepts an integer and returns the child element at that index. Accepts a string and returns the value of the property specified by the string. Accepts an integer index as the first argument and an object as the second object and inserts the object as a child at the index specified. Returns the name of the child object if available. Accepts an object and removes it from the list. Accepts an integer and removes the child at that index from the list. Accepts a string as the first argument that specifies the property and the value that the property should be set to as the second argument.
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The code in Listings 9.8 and 9.9 shows an example of using the children attribute of a root Canvas object to add a checkers game board to a Silverlight application. The code in Listing 9.8 is simple and only defines a basic Canvas object with the name parentCanvas.
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Programming Silverlight Applications
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LISTING 9.8
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Simple XAML Code That Defines a Root Canvas Element
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<Canvas x:Name= parentCanvas xmlns= http://schemas.microsoft.com/client/2007 xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml > </Canvas>
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The code in Listing 9.9 defines an onLoad function named createGame()that creates a series of Rectangle objects and uses the children attribute the parentCanvas control to add them as checker board squares, as shown in Figure 9.3.
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LISTING 9.9
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JavaScript Code That Creates a Checkerboard and Adds It as a Child Element to the Root Canvas Object
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function createSilverlight() { Silverlight.createObjectEx({ source: Page.xaml , parentElement: document.getElementById( silverlightHost ), id: SilverlightControl , properties: { width: 400 , height: 450 , version: 2.0 , background: LightGray , enableHtmlAccess: true }, events: {onLoad:createGame}, initParams: null, context: null }); } function createGame(control, context, sender) { var plugin = sender.getHost(); var game = plugin.content.findName( parentCanvas ); var doBlack = true; var blackBlock = <Rectangle Fill=\ Black\ Height=\ 50\ Width=\ 50\ /> ; var redBlock =
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Programming Silverlight Applications with JavaScript
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<Rectangle Fill=\ Red\ Height=\ 50\ Width=\ 50\ /> ; var boardCanvas = <Canvas Height=\ 400\ Width=\ 400\ Canvas.Top=\ 50\ /> ; var titleBlock = <TextBlock Text=\ Checkers\ Canvas.Top=\ 15\ Canvas.Left=\ 150\ /> ; var board = plugin.content.createFromXaml(boardCanvas); board.children.clear(); for (var x=0; x<8; x++) { for (var y=0; y<8; y++) { if(doBlack) { var square = plugin.content.createFromXaml(blackBlock); square.setValue( Canvas.Left , y*50); square.setValue( Canvas.Top , x*50); board.children.add(square); doBlack = false; } else { var square = plugin.content.createFromXaml(redBlock); square.setValue( Canvas.Left , y*50); square.setValue( Canvas.Top , x*50); board.children.add(square); doBlack = true; } } if(doBlack) doBlack = false; else doBlack = true; } var title = plugin.content.createFromXaml(titleBlock); game.children.add(title); game.children.add(board); }
Inside the createGame() function in Listing 9.9, the code first gets the root Canvas object using the findName() function. Then the code defines the XAML code used to create a Canvas game board, Rectangles for the red and black blocks, and a TextBlock for the title. Next, the code uses the clear() function of the children attribute of the root Canvas to clear any elements that might already exist. The createFromXaml() function is used to create the XAML object from text.
Part III
Programming Silverlight Applications
The code uses two for loops to create rows of alternating red and black squares. Inside the for loops the values of the index are used in the setValue() function to set the Canvas.Top and Canvas.Left properties of each block to place it at the correct coordinates of the Canvas. The add() function is used to add the squares to the game board Canvas and then to add the game board and title objects to the root Canvas object. The result is the checkerboard shown in Figure 9.4.