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CHAPTER 15 s ENHANCING THE WEB EXPERIENCE WITH SILVERLIGHT
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As you can see, the xamlFragment is a string containing a new piece of XAML. This is created and a reference to it returned to the textBlock var. This reference is then added to the tree by adding it to the children of the root element.
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The findName Method
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XAML nodes may be named using their x:Name attribute. Should you want to manipulate the content of the XAML node (to, for example, change the contents of a TextBlock), you do so by using the findName method to get a reference to that node, and then editing the reference. This was shown in our first example, in the event handler for clicking the TextBlock. Here s the code again:
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var SilverlightControl; var theTextBlock; function handleLoad(control, userContext, rootElement) { SilverlightControl = control; theTextBlock = SilverlightControl.content.findName("txt"); theTextBlock.addEventListener("MouseLeftButtonDown", "txtClicked"); } function txtClicked(sender, args) { theTextBlock.Text = "Hello to you too!"; }
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As you can see in the handleLoad function, the findName method was called to get a reference to the TextBlock (called txt). This reference was then manipulated by adding an event handler to it.
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The createObject Method
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This method allows you to create a new object for a specific purpose. In version 1.0 of Silverlight, only one object is supported: the Downloader object. The Downloader object allows you to download additional elements using asynchronous downloading functionality. It is very similar in scope to Ajax. It supports a number of properties, methods, and events that allow you to handle the download.
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Using the Downloader Object
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The Silverlight control provides a Downloader object (created using the createObject method) that allows you to get additional application assets in an asynchronous manner.
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CHAPTER 15 s ENHANCING THE WEB EXPERIENCE WITH SILVERLIGHT
It supports the following properties:
DownloadProgress: This provides a value (between 0 and 1) representing the percent-
age progress of the download session.
Status: This gets the HTTP status code for the current download session status. It is a standard HTTP status code, containing, for example, 200 for a successful download, and 404 when the resource cannot be found. StatusText: This gets the HTTP status text associated with the status code. For example, when the status is 200, the status text is OK. URI: This contains the URI of the object that you want to download.
In addition to this, you can call some methods on the Downloader object:
abort: This cancels the current download and resets all properties to their default
state.
getResponseText: This returns a string representation of the downloaded data. open: This initializes the download session, taking an HTTP verb as defined by the W3C. Silverlight 1.0 only supports the GET verb. send: This executes the download request.
Finally, the Downloader object supports two events:
completed: This will fire once the download is complete. downloadProgressChanged: This will fire while the content is downloading. It fires every time the progress changes by 5 percent or more, and when it reaches 100 percent.
To use the Downloader object, you must first create an instance of it. In JavaScript, this is very straightforward. Here s an example:
var downloader = control.createObject("downloader");
Then you need to initialize the download session by using the open method to set the URI of the resource to download, and the send method to start it downloading.
downloader.open("GET","movie.wmv",true); downloader.send();
CHAPTER 15 s ENHANCING THE WEB EXPERIENCE WITH SILVERLIGHT
If you want to monitor the download progress and completion status, you can wire up the appropriate event handlers. Here s an example:
downloader.addEventListener("downloadProgressChanged", "handleDLProgress"); downloader.addEventListener("completed", "handleDLComplete");
Now you can implement these handlers:
function handleDLProgress(sender, args) { var ctrl = sender.getHost(); var t1 = ctrl.content.findName("txt1"); var v = sender.downloadProgress * 100; t1.Text = v + "%"; } function handleDLComplete(sender, args) { alert("Download complete"); }
Summary
In this chapter, you took a look at Silverlight and how Silverlight applications are constructed. You worked your way through the anatomy of a typical Silverlight application before embarking on a tour of the Silverlight control and its various properties, methods, and events. In the next chapter, you will look at XAML, and take a tour of the XAML controls that are supported by Silverlight. You ll also look into their JavaScript API, rounding out the programming aspects of working in Silverlight. This will hopefully serve as a launch board for you to go out and get more involved with the technology!
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