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The Downloader object supports the following methods: abort The abort method cancels the current download and resets all properties to their default state. getResponseText The getResponseText method returns a string representation of the downloaded data. It takes an optional parameter that is used to name the contents of the file name in a downloaded package. open The open method initializes the download session. It takes two parameters. The first is the verb for the action. The set of HTTP verbs is documented by the W3C; however, only the GET verb is supported in Silverlight. The second parameter is the URI for the resource that is to be downloaded. send The send method executes the download request that was initialized with the Open command.
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6 The Silverlight Browser Object
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The Downloader object supports the following events: completed The completed event fires when the download is complete. It takes two parameters. The first is the object that raised the event (in this case, the downloader control itself), and the second is a set of event arguments (eventArgs). downloadProgressChanged The downloadProgressChanged event fires while content is being downloaded. It fires every time the progress (which is a value between 0 and 1) changes by 0.05 (5 percent) or more, as well as when it reaches 1.0 (100 percent). When it reaches 1.0, the completed event also fires.
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Using the Downloader Object
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With the Downloader object, you can access network resources from JavaScript. Please note that this object works only if you are running the Silverlight application from a Web server, and it will throw an error if you are simply loading the page from the file system. You create a Downloader object using the createObject method provided by the Silverlight control. Here s an example:
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<script type="text/javascript"> function handleLoad(control, userContext, sender) { var downloader = control.createObject("downloader"); } </script>
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The next step is to initialize the download session by using the open method of the Downloader object to declare the URI of the file and then to call the send method to kick off the download. Following is an example that downloads a movie file called movie.wmv:
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function handleLoad(control, userContext, sender) { var downloader = control.createObject("downloader"); downloader.open("GET","movie.wmv"; downloader.send(); }
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Part I Introducing Silverlight 3 To trap the download progress and completion, you need to wire the appropriate event handlers. Following is the same function updated accordingly:
function handleLoad(control, userContext, sender) { var downloader = control.createObject("downloader"); downloader.addEventListener("downloadProgressChanged","handleDLProgress"); downloader.addEventListener("completed","handleDLComplete"); downloader.open("GET","movie.wmv"; downloader.send(); }
Now you can implement these event handlers. In this example, the DownloadProgressChanged event is wired to a JavaScript function called handleDLProgress, and the Completed event is wired to the handleDLComplete JavaScript function. You can see these functions here:
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"); }
Note You can use the Downloader object only on applications that are hosted on a Web server. If you try to use it from a page that is loaded from the file system, you ll get an error. Do also note that the Downloader object is how you can download resources using JavaScript. If you are building Silverlight applications that use the Microsoft .NET Framework, a plethora of options to access network resources is available. These are covered in much more detail in 12, Networking and Interoperability in Silverlight.
Using the Object Model to Build an Install Experience
The Silverlight object model exposes events that you can use to build a very friendly user experience for installing Silverlight. When it comes to using a Web site that requires a plug-in to render content, the user is generally faced with a choice: Is it worth spending the time and effort to install the plug-in to get to the content that I want Is it clear to me what I am installing Do I want to install it
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