Passing parameter to Applet Dynamically

Question

Hi All,
How can i pass the parameter to applet at the runtime?
I want to play a video file. So 'm using one applet(I got this from JMF Documentation).
Here is the Applet._
import java.applet.Applet;
import java.awt.*;
import java.io.File;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;
import javax.media.*;
import javax.swing.JOptionPane;
public class TypicalPlayerApplet extends Applet implements ControllerListener
// media player
Player player = null;
String mediaFile = null;
// component in which video is playing
Component visualComponent = null;
// controls gain, position, start, stop
Component controlComponent = null;
// displays progress during download
Component progressBar = null;
* Read the applet file parameter and create the media
* player.
public void init()
setLayout(new BorderLayout());
// input file name from html param
//String mediaFile = null;
// URL for our media file
URL url = null;
// URL for doc containing applet
URL codeBase = getDocumentBase();
// Get the media filename info.
// The applet tag should contain the path to the
// source media file, relative to the html page.
if ((mediaFile = getParameter("FILE")) == null)
Fatal("Invalid media file parameter");
try
// Create an url from the file name and the url to the
// document containing this applet.
if ((url = ((new File(mediaFile)).toURI()).toURL()) == null)
Fatal("Can't build URL for " + mediaFile);
// Create an instance of a player for this media
if ((player = Manager.createPlayer(url)) == null)
Fatal("Could not create player for "+url);
// Add ourselves as a listener for player's events
player.addControllerListener(this);
catch (NoPlayerException ex)
JOptionPane.showMessageDialog(null, "Error "+ex.getMessage());
catch (MalformedURLException u)
Fatal("Invalid media file URL!");
catch(IOException i)
Fatal("IO exception creating player for "+url);
* Start media file playback. This function is called the
* first time that the Applet runs and every
* time the user re-enters the page.
public void start()
// Call start() to prefetch and start the player.
if (player != null) player.start();
* Stop media file playback and release resources before
* leaving the page.
public void stop()
if (player != null)
player.stop();
player.deallocate();
* This controllerUpdate function must be defined in order
* to implement a ControllerListener interface. This
* function will be called whenever there is a media event.
public synchronized void controllerUpdate(ControllerEvent event)
// If we're getting messages from a dead player,
// just leave
if (player == null) return;
// When the player is Realized, get the visual
// and control components and add them to the Applet
if (event instanceof RealizeCompleteEvent)
if ((visualComponent = player.getVisualComponent()) != null)
add("Center", visualComponent);
if ((controlComponent = player.getControlPanelComponent()) != null)
add("South",controlComponent);
// force the applet to draw the components
validate();
else if (event instanceof CachingControlEvent)
// Put a progress bar up when downloading starts,
// take it down when downloading ends.
CachingControlEvent e = (CachingControlEvent) event;
CachingControl cc = e.getCachingControl();
long cc_progress = e.getContentProgress();
long cc_length = cc.getContentLength();
// Add the bar if not already there ...
if (progressBar == null)
if ((progressBar = cc.getProgressBarComponent()) != null)
add("North", progressBar);
validate();
// Remove bar when finished ownloading
if (progressBar != null)
if (cc_progress == cc_length)
remove (progressBar);
progressBar = null;
validate();
else if (event instanceof EndOfMediaEvent)
// We've reached the end of the media; rewind and
// start over
player.setMediaTime(new Time(0));
player.start();
else if (event instanceof ControllerErrorEvent)
// Tell TypicalPlayerApplet.start() to call it a day
player = null;
Fatal (((ControllerErrorEvent)event).getMessage());
void Fatal (String s)
// Applications will make various choices about what
// to do here. We print a message and then exit
System.err.println("FATAL ERROR: " + s);
throw new Error(s); // Invoke the uncaught exception
// handler System.exit() is another
// choice
Following is my HTML Code,_
<applet id="TypicalPlayerApplet" name="TypicalPlayerApplet" code="TypicalPlayerApplet.class" codebase="app" width=320 height=300>
<param name=file id="param1" value="c:\\avi\\cineloop1.avi" />
</applet>
What my question is how can i pass this location "c:\\avi\\cineloop1.avi" at the runtime. I am passing the cineloop location along with the URL. Now i want to pass this location which is taken from the URL, to the Applet.
How can i achieve this. Will some one help me out.
Thanks and regards
Chennaibee.

Answer 1

Thanks winj,
I tried to pass the cine loop filename via java script on page load event.
function assignit()
var filename='c:\\avi\\loop3.avi';
var myapplet = document.getElementById('TypicalPlayerApplet');
myapplet.mediaFile=filename;
And in the page load event i called this JS.
*<body onload='assignit();'>*
It's passing the file name after the applet getting started.
How can i pass the file name before the applet getting starts.
Is it possible to call this Java Script during the page initialization.
Regards
Chennaibee.