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A common mistake is to specify the ID of the HTML element that is hosting the Silverlight object instead of the ID of the Silverlight object itself.
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The second way to access the Silverlight object is to use the getHost() function of an XAML object; for example, inside an event handler. Each XAML object has a getHost() function that returns the Silverlight object that is hosting it. The following code example accesses the Silverlight object from an event handler function and assigns it to the variable control:
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function myEvent(sender, eventArgs)
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{ var control = sender.getHost(); }
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Both methods of accessing the Silverlight object host are acceptable and work well. Typically, if an XAML object is available, it is much easier to use the getHost() method because you do not need to know the ID of the Silverlight object.
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Accessing the Silverlight application settings
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Now that you know how to access the Silverlight object, you can access the settings for the Silverlight application. You can access the settings used by the createObject() and createObjectEx() functions. This can be useful for a lot of reasons. For example, accessing the settings allows you to determine what source file was used to render the Silverlight application. Many of the Silverlight settings can be accessed directly from the Silverlight object. The settings defined by the properties argument are accessed using the settings attribute of the Silverlight object. The code example in Listing 9.2 illustrates accessing the Silverlight object in an event handler onLoad that is attached to the root canvas object of the XAML file. The onLoad handler collects information about the Silverlight object and displays it in an alert window, as shown in Figure 9.1.
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LISTING 9.2
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function createSilverlight() { Silverlight.createObjectEx({ source: Page.xaml , parentElement: document.getElementById( silverlightHost ), id: SilverlightControl , properties: { width: 100% , height: 100% , version: 1.1 , background: #1FFFFF , enableHtmlAccess: true }, events: {onLoad:onLoad}, initParams: null, context: null }); }
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function onLoad(control, context, sender) { var plugin = sender.getHost(); var msg = Silverlight Control Properties\r\n ; msg += \r\nControl : + sender.toString(); msg += \r\nParent : + plugin.parentElement.id; msg += \r\nSource : + plugin.source; msg += \r\nID : + plugin.id; msg += \r\nBackground : + plugin.settings.background; msg += \r\nMaxFrameRate : + plugin.settings.maxFrameRate; alert(msg); }
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FIGURE 9.1 The alert window displaying the settings assigned to the Silverlight application
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The example in Listing 9.2 accesses the Silverlight object from the XAML object that initiated the onLoad event. Notice that the source, id, and parentElement values are accessed directly from the object itself; however, the background and maxFrameRate values are accessed from the settings attribute. Using the Silverlight object, you are also able to modify the Silverlight application settings from JavaScript. Changes that are made to the Silverlight object modify how the object is rendered. This can be useful to dynamically change the look and feel of the Silverlight application based on environment or user settings. To illustrate changing the Silverlight object dynamically, look at the code examples in Listings 9.3, 9.4, and 9.5 that dynamically set the height, width, and background attributes of the Silverlight object using random values when the page is loaded.
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LISTING 9.3
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XAML File Named Page.xaml That Renders a Simple Canvas That Contains a TextBlock
<Canvas x:Name= parentCanvas xmlns= http://schemas.microsoft.com/client/2007 xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml > <TextBlock x:Name= myText Text= Silverlight /> </Canvas>
LISTING 9.4
HTML File That Embeds as Silverlight Application
<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd > <html xmlns= http://www.w3.org/1999/xhtml > <head> <title>Silverlight JavaScript Project Test Page </title> <script type= text/javascript src= Silverlight.js ></script> <script type= text/javascript src= TestPage.html.js ></script> </head> <body> <div id= silverlightHost > <script type= text/javascript > createSilverlight(); </script> </div> </body> </html>
LISTING 9.5
JavaScript Code That Creates a Silverlight Application Object and Dynamically Sets the Height, Width, and Background Color
function createSilverlight() { Silverlight.createObjectEx({ source: Page.xaml , parentElement: document.getElementById( silverlightHost ),
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id: SilverlightControl , properties: { width: 400 , height: 200 , version: 2.0 , enableHtmlAccess: true , background: #1FFFFF }, events:{ onLoad: onLoad }, initparams: null, context: null }); } function onLoad(control, context, sender) { var plugin = sender.getHost(); var sizes = [100, 200, 300]; var colors = [ Blue , LightGray , Gray ]; var randNum = Math.round(Math.random() * 2); plugin.width = sizes[randNum]; plugin.height = sizes[randNum]; plugin.settings.background = colors[randNum]; }
In this example, the onLoad function randomly gets a color and size setting from an array and then sets the source attribute of the Silverlight object. The result is that the size and background color of the Silverlight application are changed dynamically each time the Web page is loaded, as shown in Figure 9.2.
FIGURE 9.2 Dynamically rendering random size and background color settings in a Silverlight application