Windows Media Player 11 SDK Controlling the Playback Experience 

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Controlling the Playback Experience

This section discusses some of the playback issues you may encounter when using the HTMLView feature.

Requiring the user to view Web-based content

You may decide that you only want users to be able to enjoy your digital media content when the HTMLView Web-based content is also displayed. You can include script code in your HTMLView Web page that stops playback of the digital media content if the user switches away from the Now Playing feature. To do this, you can specify an event handler for the unload event as part of the BODY element, as the following HTML code demonstrates:

<BODY onunload = "UnloadMe();">

Then you can include script code in your event handler function to close the file in the Player. The following example code does this:

function UnloadMe()

When the user switches away from Now Playing by clicking a button to open another Windows Media Player feature, such as the library, the Player closes the embedded browser. This causes the onunload event to occur, running the script in the function named UnloadMe. The Player.close method stops playback and unloads the current digital media file. To view the content again, the user must reopen the original .asx file. This technique also stops playback when the user navigates away from the HTMLView Web page. Note that this technique cannot prevent the user from viewing the digital media content when he or she switches to skin mode.

You will recall that the HTMLView parameter can be applied to each ENTRY element in an .asx file. You can take advantage of this feature to ensure that your HTMLView content is displayed each time a new digital media file starts. To do this, associate a PARAM element for HTMLView with each entry in your .asx playlist. When each entry plays, the Player returns to full mode and displays the HTMLView content you specified in the playlist.

URL and FILE script command types are disabled by default

Windows Media Player 9 Series or later provides settings that enable the user to specify whether URL and FILE type script commands are able to run. By default, both of these script command types do not run. If you use custom script command types, they will continue to run, regardless of the user setting. If you must use URL and FILE type script commands, you must prompt the user to change the settings. To change the settings, click Tools, then Options, and then Security.

Reopening an HTMLView does not reload the Web page

When the user opens an .asx file that includes an HTMLView parameter and subsequently reopens the same file, Windows Media Player does not refresh the HTMLView Web page. This also means that if you have allowed users to navigate away from your HTMLView Web page, the Player does not return the embedded browser to the initial HTMLView Web page.

Hiding the content location

You might decide that you don't want Windows Media Player to display the location of your digital media content while it is playing an .asx file. Usually, Windows Media Player only shows information about the playlist itself when streaming content from the Internet. However, there are further steps you can take to prevent users from determining the location of your content. For example, one way to ensure that the Player does not display the path to your content is to stream your content using Windows Media Services server-side playlists. That way, when the user views the properties for the content, he or she sees the URL of the server and not the URL of your content.

See Also