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This method accepts an instance of a class described as being a ScriptableType. The object is registered with the scripting engine by passing it as the second parameter to the RegisterScriptableObject method, which then uses the first parameter to create an alias for the class instance. This alias is appended to the content property of the hosting Silverlight plug-in. The Silverlight plug-in exposes a subobject called content, which exposes the content of a Silverlight plug-in; this is the scripting version of the Content property of the SilverlightHost class previously discussed. You can access your scriptable object by first retrieving the plug-in instance and then referencing the ScriptableMember you want, as demonstrated in listing 4.1.
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Listing 4.1 Referencing a managed item from script on the HTML page
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<!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 Project Test Page </title> <script type="text/javascript" src="Silverlight.js"></script> <script type="text/javascript"> function buttonClick() { var plugin = document.getElementById("mySilverlightControl"); plugin.content.bridge.ExecuteWebService(); Scriptable object } and method </script> </head> <body style="height:100%;"> <div id="mySilverlightHost" style="height:100%;"> <script type="text/javascript"> var host = document.getElementById("mySilverlightHost"); Silverlight.createObjectEx({ source: "ClientBin/MySilverlightApp.xap", parentElement: host, id: "mySilverlightControl", properties: { height: "100%", width: "100%", version: "2.0" }, events: { } }); </script> </div> <input type="button" onclick="buttonClick();" value="Execute Web Service" /> </body> </html>
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This listing demonstrates how a scriptable object can be accessed from a plug-in instance. This plug-in gives you the ability to use managed code from JavaScript. This can be valuable in situations where you don t need the rich visual features of
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Silverlight. For instance, you may decide to create something known as a headless Silverlight application. A headless Silverlight application is an application that doesn t have a UI. Instead, it uses objects registered as ScriptableType elements as the brains for a traditional web page. This approach allows you to write nonvisual components using the .NET Framework and integrate existing code libraries. This type of application is valuable because you can use it to perform tasks that the browser s JavaScript engine can t do. For instance, you may choose to use a headless Silverlight application to make cross-domain requests or listen to a socket (both items discussed in chapter 14). Regardless, you may still need to rely on the features of a preexisting JavaScript library. For these situations, you can use Silverlight to call JavaScript from managed code.
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Silverlight gives you the flexibility to call JavaScript from managed code and, in turn, the ability to call any method on an HTML or JavaScript object. This can be useful if you re integrating Silverlight with a preexisting web application. There s one spot in particular where this feature is especially valuable: printing. Silverlight has basic printing capabilities (see chapter 19), but the Window object in the HTML DOM also exposes a print method. You can use Silverlight s ability to call a function on a JavaScript object to deliver this functionality. To accomplish this, you use a method called Invoke. This method can be used to execute a JavaScript function from managed code, as demonstrated in the following C# code:
HtmlWindow window = HtmlPage.Window; window.Invoke("print", new object[]{});
This code can be used to print the current web page, including your Silverlight application. The Invoke method can be applied to any HtmlDocument, HtmlElement, or HtmlWindow object. The first parameter of this method represents the name of the function to be invoked. The second parameter represents the arguments that will be passed to this function when it s called. As you can see, this parameter is an array of objects, so you have the flexibility to pass anything you need to a JavaScript function. Silverlight gives you the ability to execute JavaScript code from managed code. In addition, you can go the other way and call managed code from JavaScript. These two features show how you can use Silverlight to bridge the scripting and managed code worlds. This is important because you need to use this approach if you want to communicate between two different types of plug-ins, such as Flash and Silverlight, or between technologies such as AJAX and Silverlight. Silverlight gives you the ability to bridge scripting and managed code running inside the browser. In addition, you can use Silverlight to learn about the user s browser window. What s perhaps even more interesting, you can use managed code to interact with the HTML DOM. All this is made possible by the rich HTML DOM API that s an integral part of Silverlight.
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