JavaScript calls method on Java Applet-- Problem

Hi all,
I have a problem as following:
I have a method on JavaScript calling a method on Java Applet. A method on JavaScript repeatedly retrieves data form the server , let's say; every 100 ms and it calls the method on Java to draw a graph(I use thread to call repaint()). The problem is, if I leave the applet site(or the site has lost the focus), the stop() will be called and I can't recieve data from JavaScript anymore. If I go back to the site, the applet starts, but the graph doesn't show the figure, as it supposes to show.
how can I tell the browser doesn't call the stop() or there is another way to solve this problem?
Thanks for all answers. CU.
A-Pex

my own fault.. it's not the browser or the applet.. It's my computer.. it's too old for this applet..
Does anyone know, how to optimize the applet with thread? thanks..

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Call Javascript Function in my JAVA Applet

Hello every body,
I would like to be able to call a javascript function in my Java applet.
I know to call JAVA function with a javascript function but not inverse.
Someone can help me please ?

Look at chapters 25/26 (or so) in Sun's Plugin Developer's Guide.

Is it possible to call methods of JAVA objects from ABAP?

Hi all,
Does anyone know if it is possible to call methods of java classes from ABAP?
Regards,
Sukru

Hi,
Yes we can access the classes of JAVA in ABP.
This is posible from version ECC 6 onward with NETWEAVER atrhcitecuture.
Pls go through this link-
http://help.sap.com/saphelp_nw04s/helpdata/en/84/54953fc405330ee10000000a114084/frameset.htm
http://help.sap.com/saphelp_nw04s/helpdata/en/e1/b5443e02a9ab4186a6e1240a9a2455/frameset.htm
Here also we use the JCO connector objects
These clearly show the methods to use JAVA.
<removed_by_moderator_together_with_points>
Regards
Chandralekha
Edited by: Julius Bussche on Jul 8, 2008 5:58 PM

CONSTANT Java Applet Problems, HELP!

Alright, since I've had my mac, Java has never worked properly. I have the latest version of OSX and of Java, I tried repairing permissions and also tried manually installing the latest OSX update, but whenever a website uses the Java Applet (for a game / chatroom, etc.) It will never load, or it will freeze the computer while attempting to load.
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Several issues
1) Don't paint in the JApplet itself. Instead paint in a JPanel and override its paintComponent method, not its paint method. In fact you would do well to create the GUI in this JPanel and then add the JPanel to the JApplet's contentPane.
2) Don't override update and don't call update.
3) The first line of your paintComponent(Graphics g) override should be a call to super.paintComponent(g)
4) I would strongly urge you to not use NetBeans to generate your Swing code. By doing this, you're hampering your Swing education.
5) You really shouldn't be adding a MouseListener to a JButton. Instead you add ActionListener's to buttons.
Good luck and HTH

Java applets problem!

I cannot load/bring up webpages/chatroom links. The consistent error message is "Loading Java Applet Failed". I have J2SE RE 5.0Update 9 already on my pc.
I have ZoneAlarm PC protection yet I have never had this problem before. I am running Windows XP SP2. HELP anyone????
An example of an error message is below:
java.io.IOException: Server returned HTTP response code: 403 for URL: http://host.digichat.com/DigiChat/DigiClasses/Client.jar
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.plugin.net.protocol.http.HttpUtils.followRedirects(Unknown Source)
at sun.plugin.cache.CachedJarLoader.isUpToDate(Unknown Source)
at sun.plugin.cache.CachedJarLoader.loadFromCache(Unknown Source)
at sun.plugin.cache.CachedJarLoader.load(Unknown Source)
at sun.plugin.cache.JarCache.get(Unknown Source)
at sun.plugin.net.protocol.jar.CachedJarURLConnection.connect(Unknown Source)
at sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarFile(Unknown Source)
at sun.misc.URLClassPath$JarLoader.getJarFile(Unknown Source)
at sun.misc.URLClassPath$JarLoader.<init>(Unknown Source)
at sun.misc.URLClassPath$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getLoader(Unknown Source)
at sun.misc.URLClassPath.getResource(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
load: class com.diginet.digichat.client.DigiChatApplet not found.
java.lang.ClassNotFoundException: com.diginet.digichat.client.DigiChatApplet
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more
load: class com.diginet.digichat.client.DigiChatApplet not found.
java.lang.ClassNotFoundException: com.diginet.digichat.client.DigiChatApplet
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more

HI Pankaj,
depending on your Java applett it might be possible that the applett opens a new connection. therefore depending on your total configuration it might be possible taht another server is used.Even worse if you do SSL-offloading the applett might tell the user to do http instead of https. I suggest that you check with a sniffertrace what is happening:
1) is there a new connection setup while the applett runs
2) is it again http or https and if https is it a new https session which will be again balanced not depending on the original https session.
Hope that helps
regards,
Joerg

SSL Load Balancing (Java applets problem)

Hi,
I have implemented loadbalancing of two webservers using CSS 11503.
Servers are containing SSL pages which need to be loadbalanced.
I have tried configuring the content rule for ssl using
port 443
application ssl
advanced-balance ssl
commands.The site opens properly using the VIP address (checked the SSL certificate issued by one of the servers. ) and I am able to see all the TABS on the same.The real problem starts when I am trying to upload a file to the server using the VIP address.
The moment I try to upload a file the session shifts to the second server and prompts for new certificate issued by the second server.
One more thing which I would like to mention here is that while uploading the file, JAVA is used.
i.e.the files are being uploaded using JAVA applets.
If anybody has encountered this kind of problem kindly suggest on the same.
Would appreciate if you send the solution on [email protected]
Any configs needed plz contact me on the above e-mail ID.
Thanks,
Pankaj P.

HI Pankaj,
depending on your Java applett it might be possible that the applett opens a new connection. therefore depending on your total configuration it might be possible taht another server is used.Even worse if you do SSL-offloading the applett might tell the user to do http instead of https. I suggest that you check with a sniffertrace what is happening:
1) is there a new connection setup while the applett runs
2) is it again http or https and if https is it a new https session which will be again balanced not depending on the original https session.
Hope that helps
regards,
Joerg

Java Applet problem in Internet Explorer 7 with Tab Key

Hi
I am developing some web pages in which iam using a java applet. so far the intended user are supposed to be using Internet Explorer 7. the problem i am facing is that when i press the tab key within the applet. the control get transferred to new tab position in the web page outside the applet and i have to click back to the applet to get control again transferred to the applet.
i want to restrict the control of tab so that when tab is pressed within the applet the tab should not move to next tab position in the page and remain confined within the applet.
Can someone please help me how can i achieve this and whether i have to do coding for it in the applet or in the web page...so that within the applet the Internet Explorer tab control should remain disabled..

Hello all,
I have the same problem, but I don't found a solution. Could you resolved the problem and who??
Thank you.
Jorge

Simple Question Calling methods from Java files through JSP without JVM

Hi.
I've got a simple question (forigve my newbieness)...
If I'm running Tomcat can I exectue a method in a compiled Java file from a JSP page without having the JVM installed on the server?
Any thoughts or additional comments would be appreciated.
Many thanks.

No... but that's because you can't run Tomcat without
a JVM installed on the server.
If you are running Tomcat, you are running a JVM for
the JSP pages to run in, in which case, yes, the JSP
pages can call the other Java code... as long as it's
in the classpath.Thanks a lot for the replies.
So just to check, if I sign up with a hosting company that offers Tomcat then the JVM will be installed on the server and I can call other Java code as long as it's in the classpath?
I just want to make sure before I sign up with a hosting company =D
Thanks again!

Calling perl from java applets

I have problems in executing PERL from a JAVA applet and Swing interface.
I'm working under Windows 98.
My aim is the following:
When I click on the "Analizza" button,
I want to execute a PERL program and automatically
close the DOS window after completion. If there
is an error, this error should be displayed in DOS.
I wrote this piece of code
public void actionPerformed(ActionEvent eventoUtente){
     String comandoPulsante = eventoUtente.getActionCommand();
          if (comandoPulsante == "Analizza"){
          Runtime rt = Runtime.getRuntime();
          try{
          Process pr= rt.exec("cmd -c c:\\command /c perl C:\\_webasco\\contatutto2.pl");
          catch(java.io.IOException ioEx)
          System.out.println("IOEx:"+ioEx.getMessage());
I tried also with a Windows executable, ie I replaced the line
     Process pr= rt.exec("cmd -c c:\\command /c perl C:\\_webasco\\contatutto2.pl");
with
     Process pr= rt.exec("command /c c:\\windows\notepad.exe");
but in both cases nothing happens within the applet.
What am I doing wrong????
Any suggestions is warmly welcomed.
Thank you
Marina

I know nothing about Perl, but the line
if (comandoPulsante == "Analizza"){
compares references not values and will always return false. Try:
if (comandoPulsante.equals("Analizza")) {

How do you call a JavaScript function from a Java applet

I have an Applet that needs to run on the following platforms: Internet Explorer (Windows-NT, Windows -2000), Netscape (Windows-NT, Windows-2000, Sun(Solaris), RedHat(Linux), HP(11.0), IBM(AIX)).
The Applet needs to call a JavaScript function that is included on the HTML page that contains the applet. In JRE-1.3.1 I used the AppletContext.showDocument(url,"_self" ) where the url is "javascript:MyScript('param1')". This works just fine. I tried using showDocument without the second parameter and all the other choices for the second parameter and none of them worked (nothing happened).
I tried the same code with JRE version 1.4-beta. It seems that version 1.4-beta no longer supports a URL that starts with "javascript" in the AppletContext.showDocument(url,"_self" ) method. The error is:
netscape.javascript.JSException: call does not support self.open
at sun.plugin.javascript.navig.Window.call(Unknown Source)
at sun.plugin.ActivatorAppletContext.showDocument(Unknown Source)
I tried to catch the JSException but I cannot seem to.
I then tried a completely different approach. I then grabbed the JSObject for the page and tried to call my javascript function (MyScript) directly:
JSObject theObj = JSObject.getWindow(this);
Object paramArray[] = new Object[1];
paramArray[0] = Param1;
theObj.call("MyScript", paramArray);
This worked fine on Netscape[Windows-NT, Windows-2000]. HP throws a JSException on getWindow() and Solaris just hangs. I did not even try IE.
What is the recommended approach here?

you can try this, it worked for me:
JSObject win = JSObject.getWindow(this);
win.eval(function_call);
I have other ways also, so if this doesn't work, let me know.

Calling method from another class problem

hi,
i am having problem with my code. When i call the method from the other class, it does not function correctly?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Dice extends JComponent
    private static final int SPOT_DIAM = 9;
    private int faceValue;
    public Dice()
        setPreferredSize(new Dimension(60,60));
        roll();
    public int roll()
        int val = (int)(6*Math.random() + 1);
        setValue(val);
        return val;
    public int getValue()
        return faceValue;
    public void setValue(int spots)
        faceValue = spots;
        repaint();
    @Override public void paintComponent(Graphics g) {
        int w = getWidth();
        int h = getHeight();
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.WHITE);
        g2.fillRect(0, 0, w, h);
        g2.setColor(Color.BLACK);
        g2.drawRect(0, 0, w-1, h-1);
        switch (faceValue)
            case 1:
                drawSpot(g2, w/2, h/2);
                break;
            case 3:
                drawSpot(g2, w/2, h/2);
            case 2:
                drawSpot(g2, w/4, h/4);
                drawSpot(g2, 3*w/4, 3*h/4);
                break;
            case 5:
                drawSpot(g2, w/2, h/2);
            case 4:
                drawSpot(g2, w/4, h/4);
                drawSpot(g2, 3*w/4, 3*h/4);
                drawSpot(g2, 3*w/4, h/4);
                drawSpot(g2, w/4, 3*h/4);
                break;
            case 6:
                drawSpot(g2, w/4, h/4);
                drawSpot(g2, 3*w/4, 3*h/4);
                drawSpot(g2, 3*w/4, h/4);
                drawSpot(g2, w/4, 3*h/4);
                drawSpot(g2, w/4, h/2);
                drawSpot(g2, 3*w/4, h/2);
                break;
    private void drawSpot(Graphics2D g2, int x, int y)
        g2.fillOval(x-SPOT_DIAM/2, y-SPOT_DIAM/2, SPOT_DIAM, SPOT_DIAM);
}in another class A (the main class where i run everything) i created a new instance of dice and added it onto a JPanel.Also a JButton is created called roll, which i added a actionListener.........rollButton.addActionListener(B); (B is instance of class B)
In Class B in implements actionlistener and when the roll button is clicked it should call "roll()" from Dice class
Dice d = new Dice();
d.roll();
it works but it does not repaint the graphics for the dice? the roll method will get a random number but then it will call the method to repaint()???
Edited by: AceOfSpades on Mar 5, 2008 2:41 PM
Edited by: AceOfSpades on Mar 5, 2008 2:42 PM

One way:
class Flintstone
    private String name;
    public Flintstone(String name)
        this.name = name;
    public String toString()
        return name;
    public static void useFlintstoneWithReference(Flintstone fu2)
        System.out.println(fu2);
    public static void useFlintstoneWithOutReference()
        Flintstone barney = new Flintstone("Barney");
        System.out.println(barney);
    public static void main(String[] args)
        Flintstone fred = new Flintstone("Fred");
        useFlintstoneWithReference(fred); // fred's the reference I"m passing to the method
        useFlintstoneWithOutReference();
{code}
can also be done with action listener
{code}    private class MyActionListener implements ActionListener
        private Flintstone flintstone;
        public MyActionListener(Flintstone flintstone)
            this.flintstone = flintstone;
        public void actionPerformed(ActionEvent arg0)
            //do whatever using flinstone
            System.out.println(flintstone);
    }{code}
Edited by: Encephalopathic on Mar 5, 2008 3:06 PM

SQL Server 2000 - JDBC + Java Applet problem

Hai
I have some problem connecting my SQL server database with Java.
I use Applet to make my interface.
I use Windows 2000 server.
Here is my program listing :
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.sql.*;
public class VLookup extends JApplet {
String database = "jdbc:odbc:Driver={SQL Server};SERVER=Windows2000;uid=sa;pwd=;Database=User-Phone Database";
String user = "sa";
String password = "";
Statement s;
Connection c;
JTextField searchFor = new JTextField(10);
JLabel completion = new JLabel(" ");
JTextArea results = new JTextArea(40, 20);
public void init() {
searchFor.getDocument().addDocumentListener(new SearchL());
JPanel p = new JPanel();
p.add(new Label("ID to search for :"));
p.add(searchFor);
p.add(completion);
Container cp = getContentPane();
cp.setLayout(new BorderLayout());
cp.add(p, BorderLayout.NORTH);
cp.add(results, BorderLayout.CENTER);
try {
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
c = DriverManager.getConnection(database, user, password);
s = c.createStatement();
} catch(Exception e) {
results.setText(e.getMessage());
class SearchL implements DocumentListener {
public void changedUpdate(DocumentEvent e){}
public void insertUpdate(DocumentEvent e){
textValueChanged();
public void removeUpdate(DocumentEvent e){
textValueChanged();
public void textValueChanged() {
ResultSet r;
if(searchFor.getText().length() == 0) {
completion.setText("");
results.setText("");
return;
try {
r = s.executeQuery("SELECT " + "Tipe " + "FROM " + "Time " + "WHERE " + "(Tipe Like '" + searchFor.getText() + "%') "
+ "GROUP BY " + "Tipe " + "ORDER BY " + "Tipe " );
if(r.next())
completion.setText(r.getString("Tipe"));
r = s.executeQuery("SELECT " + "ID_Pengguna, Phone_Number, Tipe " + "FROM " + "Time "
+ "WHERE " + "(Tipe ='" + completion.getText() + "') "
+ "GROUP BY " + "ID_Pengguna, Phone_Number, Tipe "
+ "ORDER BY " + "ID_Pengguna, Phone_Number " );
} catch(Exception e) {
results.setText(searchFor.getText() + "\n");
results.append(e.getMessage());
return;
results.setText("");
try {
while(r.next()) {
results.append(r.getString("ID_Pengguna") + ", " + r.getString("Phone_Number") + ", " + r.getString("Tipe") + "\n");
} catch(Exception e) {
results.setText(e.getMessage());
public static void main(String[] args) {
JApplet applet = new VLookup();
JFrame frame = new JFrame("User ID");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
frame.add(applet);
frame.setSize(500, 200);
applet.init();
applet.start();
frame.setVisible(true);
} ///:~
And java catch error like this : access denied (java.lang.RuntimePermission access ClassInPackage.sun.jdbc.odbc)
What is wrong ??
Is there any problem with my DNS ? 'cos I don't know how to set up my DNS.
Can u help my with this problem ??
Thank's

You need to read up on what applets are capable of. Applets generally cannot open connections to things like databases due to sandboxing. There are a couple of ways to get around this. The applet can connect to a servlet on the same machine from which it came and have the servlet do the database accesses. Alternately, you can create a signed applet which allows you to get around some of these sandboxing issues.If tried to make localhost on my computer ( by setting my IIS configuration setting, and using Configure SQL XML Support in IIS I've created a new http://localhost/skripsi to my SQL database.
Is there any command that I have to add to my program listing so the applet can work as I wish ??
Is there any way to use applet to connect my database withaout using servlet, and can u explain siggned applet to mey ??
Sorry, I don't really know java very well.
driver type 4 ??

C++ calling java applet

Hello,
Is it possible for Visual C++ to call methods from java applet. If possible, may I know roughly how to do so.
Thank you in advance.

Hi,
You need to create JavaVM in your VC++ code.
Get the class of the Applet.Then get the method id in the applet.
You can do it.
Since you have asked for rough idea, I stop with this.
And you can refer to the following URL
http://java.sun.com/docs/books/jni/html/jniTOC.html
All the best.
LathaDhamo

Calling javascript method from java

Hi this is sri,
I have one doubt on Java Applets "how to call the javascript method from java Applet".Can u give me the complete sample code for one program(both java applet file and html file also)because i can easily understand the programming flow.
Thanks ,
Srilekha.

It's an extremely important skill to learn how to search the web. Not only will it increase your research and development talents, it will also save you from asking questions that have already been answered numerous times before. By doing a little research before you ask a question, you'll show that you're willing to work and learn without needing to have your hand held the entire time; a quality that is seemingly rare but much appreciated by the volunteers who are willing to help you.
If you've done the research, found nothing useful, and decide to post your question, it's a great idea to tell us that you've already searched (and what methodologies you used to do your research). That way, we don't refer you back to something you've already seen.
To get you started, here's a link...
http://www.google.com/search?q=call+java+from+javascript

COMMUNICATION BETWEEN JAVASCRIPT AND JAVA APPLET: US$20 AWARD FOR SOLUTION!

COMMUNICATION BETWEEN JAVASCRIPT AND JAVA APPLET PROBLEM (Easy Filter Java Applet) -
US$20 TO ANYONE WHO CAN RESOLVE THE PROBLEM
To forum visitors:
I am prepared to pay a standard shareware fee of US$20 to a user who can resolve this technical problem.
If your advice resolves the problem, I'll forward the payment to your postal address (include your
address with your reply, and also your email address)
I am attempting to enable a HTML button (using Javascript's onClick command) to directly input a number into one of the parameter text boxes in the Easy Filter Java applet (ie, enter a new color value number in the text field of the standard Colors Multiplicator Filter interface).
The applet is Freeware and can be downloaded at: http://www.javazoom.net/applets/easyfilter10/EasyFilter10.html
(It is a very effective bitmap display and editing utility)
To achieve this, I am trying to access the part of the applet that defines and sets the textbox. The text box is defined in the .class file by accessing the parameter details in the genericfilter.txt file (accompanies the .class files). I need to access 'private String appletInitialize()' and then one of the 'textFieldParameters' which sets the textbox.
I understand the basic syntax for referencing the applet:
document.appletname.setString("An example"). However, accessing the text fields in this applet is more complex!!
Please can you recommend the correct Javascript syntax to achieve communication with the applet.
Thank you for your kind assistance.
JM Graham
[email protected]
The Java source code for the applet: EasyFilter.class
# Easy Filter - E.B/JavaZOOM 1999 #
# Contact: [email protected] #
# http://javazoom.hypermart.net #
/* Originally compiled from EasyFilter.java */
import java.awt.*;
import java.io.*;
import java.net.*;
import java.applet.Applet;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.MemoryImageSource;
import java.awt.image.PixelGrabber;
import java.util.Vector;
public synchronized class EasyFilter extends Applet implements KeyListener
private String paramFileName;
private Color bgColor;
private Color fgColor;
private Color parColor;
private Color sepColor;
private Color titleColor;
private Color helpColor;
private int WinWidth;
private int WinHeight;
private String title;
private String logoFileName;
private String originalImageFileName;
private String filteredCaption;
private String originalCaption;
private Vector paramsName;
private Vector paramsValue;
private Vector paramsComment;
private Panel panelParameters[];
private Label labelParameters[];
private TextField textFieldParameters[];
private Label labelComments[];
private int nbParameters;
private ScrollPane scrollPaneParams;
private Panel panelParams;
private Image theLogo;
private Image theOriginalImage;
private Image theFilteredImage;
private int theOriginalPixelArray[];
private int logoWidth;
private int logoHeight;
private int imageWidth;
private int imageHeight;
private drawCanvas canvasTitle;
private Panel panelTitle;
private Label labelTitle;
private Panel panelImages;
private Panel panelOriginalImage;
private drawCanvas canvasOriginalImage;
private Label labelOriginalImage;
private Panel panelFilteredImage;
private drawCanvas canvasFilteredImage;
private Label labelFilteredImage;
private Panel panelHelp;
private Label labelHelp;
private int Yspc;
private FilterImplementation theFilter;
public void init()
String string = null;
string = appletInitialize();
setBackground(bgColor);
if (string != null)
removeAll();
setBackground(Color.white);
setForeground(Color.black);
Label label = new Label(new StringBuffer("Error: ").append(string).toString(), 1);
Panel panel = new Panel();
panel.add(label);
add(panel);
setLayout(new FlowLayout(1, 5, Yspc));
public void keyPressed(KeyEvent keyEvent)
panelHelp.removeAll();
boolean flag = true;
if (KeyEvent.getKeyText(keyEvent.getKeyCode()).equals("Enter"))
for (int i = 0; i < nbParameters; )
try
paramsValue.setElementAt(new Double(textFieldParameters.getText()), i);
i++;
catch (NumberFormatException e)
labelHelp.setText(labelParameters[i].getText() + ": Not a Number");
flag = false;
break;
if (flag == 1)
labelHelp.setText(" .... Running, please wait .... ");
labelHelp.setAlignment(1);
panelHelp.add(labelHelp);
panelHelp.doLayout();
theFilter.updateParameters(paramsValue);
theFilter.computeFilter();
theFilteredImage = createImage(new MemoryImageSource(theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight(), theFilter.getFinalImageBuffer(), 0, theFilter.getFinalImageWidth()));
canvasFilteredImage.setImage(theFilteredImage);
canvasFilteredImage.setBounds(0, 0, theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight());
canvasFilteredImage.repaint();
panelHelp.removeAll();
labelHelp.setText("- Done -");
else
labelHelp.setText("- Press Enter to run the Filter -");
labelHelp.setAlignment(1);
panelHelp.add(labelHelp);
panelHelp.doLayout();
public void keyReleased(KeyEvent keyEvent)
public void keyTyped(KeyEvent keyEvent)
private String appletInitialize()
WinWidth = size().width;
WinHeight = size().height;
if (getParameter("bgcolor") == null)
bgColor = new Color(0, 0, 40);
else
bgColor = new Color(Integer.parseInt(getParameter("bgcolor"), 16));
if (getParameter("fgcolor") == null)
fgColor = new Color(255, 255, 255);
else
fgColor = new Color(Integer.parseInt(getParameter("fgcolor"), 16));
if (getParameter("sepcolor") == null)
sepColor = new Color(158, 128, 128);
else
sepColor = new Color(Integer.parseInt(getParameter("sepcolor"), 16));
if (getParameter("parcolor") == null)
parColor = new Color(24, 24, 24);
else
parColor = new Color(Integer.parseInt(getParameter("parcolor"), 16));
if (getParameter("titlecolor") == null)
titleColor = new Color(255, 255, 0);
else
titleColor = new Color(Integer.parseInt(getParameter("titlecolor"), 16));
if (getParameter("helpcolor") == null)
helpColor = new Color(0, 255, 255);
else
helpColor = new Color(Integer.parseInt(getParameter("helpcolor"), 16));
paramsName = new Vector();
paramsValue = new Vector();
paramsComment = new Vector();
paramFileName = getParameter("paramfile");
String string = readParams(paramFileName);
if (string != null)
return string;
MediaTracker mediaTracker = new MediaTracker(this);
theOriginalImage = getImage(getDocumentBase(), originalImageFileName);
mediaTracker.addImage(theOriginalImage, 0);
if (logoFileName != null)
theLogo = getImage(getDocumentBase(), logoFileName);
mediaTracker.addImage(theLogo, 1);
try
mediaTracker.waitForAll();
catch (InterruptedException e1)
return "Error while loading image";
if (mediaTracker.isErrorAny())
return "Error while loading image";
if (logoFileName != null)
logoWidth = theLogo.getWidth(this);
logoHeight = theLogo.getHeight(this);
imageWidth = theOriginalImage.getWidth(this);
imageHeight = theOriginalImage.getHeight(this);
theOriginalPixelArray = new int[imageWidth * imageHeight];
PixelGrabber pixelGrabber = new PixelGrabber(theOriginalImage, 0, 0, imageWidth, imageHeight, theOriginalPixelArray, 0, imageWidth);
try
pixelGrabber.grabPixels();
panelTitle = new Panel();
canvasTitle = new drawCanvas();
labelTitle = new Label();
panelTitle.setLayout(new FlowLayout(1, 10, Yspc));
add(panelTitle);
panelTitle.setBackground(bgColor);
panelTitle.add(canvasTitle);
canvasTitle.setImage(theLogo);
canvasTitle.setBounds(0, 0, logoWidth, logoHeight);
labelTitle.setText(title);
catch (InterruptedException e2)
return "Internal Error, Try RELOAD !";
if (title != null)
panelTitle.add(labelTitle);
labelTitle.setForeground(titleColor);
labelTitle.setFont(new Font("Dialog", 1, 14));
panelImages = new Panel();
panelOriginalImage = new Panel();
canvasOriginalImage = new drawCanvas();
labelOriginalImage = new Label();
panelFilteredImage = new Panel();
canvasFilteredImage = new drawCanvas();
labelFilteredImage = new Label();
panelImages.setLayout(new FlowLayout(1, 10, Yspc));
add(panelImages);
panelImages.setBackground(bgColor);
panelOriginalImage.setLayout(new BorderLayout(0, 2));
panelImages.add(panelOriginalImage);
panelOriginalImage.setBackground(Color.black);
panelOriginalImage.add("Center", canvasOriginalImage);
canvasOriginalImage.setImage(theOriginalImage);
canvasOriginalImage.setBounds(0, 0, imageWidth, imageHeight);
labelOriginalImage.setText(originalCaption);
labelOriginalImage.setAlignment(1);
panelOriginalImage.add("South", labelOriginalImage);
labelOriginalImage.setBackground(Color.lightGray);
labelOriginalImage.setForeground(Color.black);
labelOriginalImage.setFont(new Font("SansSerif", 0, 10));
panelFilteredImage.setLayout(new BorderLayout(0, 2));
panelImages.add(panelFilteredImage);
panelFilteredImage.setBackground(Color.black);
panelFilteredImage.add("Center", canvasFilteredImage);
theFilter = new FilterImplementation(paramsValue, theOriginalPixelArray, imageWidth, imageHeight);
theFilter.computeFilter();
theFilteredImage = createImage(new MemoryImageSource(theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight(), theFilter.getFinalImageBuffer(), 0, theFilter.getFinalImageWidth()));
canvasFilteredImage.setImage(theFilteredImage);
canvasFilteredImage.setBounds(0, 0, theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight());
labelFilteredImage.setText(filteredCaption);
labelFilteredImage.setAlignment(1);
panelFilteredImage.add("South", labelFilteredImage);
labelFilteredImage.setBackground(Color.lightGray);
labelFilteredImage.setFont(new Font("SansSerif", 0, 10));
scrollPaneParams = new ScrollPane(0);
panelParams = new Panel();
nbParameters = paramsName.size();
int i = WinHeight - (33 + 7 * Yspc + logoHeight + imageHeight + 23);
if (i < Yspc + 2 + 24)
i = Yspc + 2 + 24;
scrollPaneParams.setBounds(0, 0, WinWidth - 10, i);
panelParams.setLayout(new GridLayout(nbParameters, 1, 5, Yspc / 2));
scrollPaneParams.add(panelParams);
panelParams.setBackground(sepColor);
panelParameters = new Panel[nbParameters];
labelParameters = new Label[nbParameters];
textFieldParameters = new TextField[nbParameters];
labelComments = new Label[nbParameters];
for (int j = 0; j < nbParameters; j++)
panelParameters[j] = new Panel();
panelParameters[j].setLayout(new FlowLayout(0, 5, 1));
panelParams.add(panelParameters[j]);
panelParameters[j].setBackground(parColor);
labelParameters[j] = new Label();
labelParameters[j].setText((String)paramsName.elementAt(j));
panelParameters[j].add(labelParameters[j]);
labelParameters[j].setForeground(fgColor);
labelParameters[j].setFont(new Font("Dialog", 1, 12));
textFieldParameters[j] = new TextField(8);
textFieldParameters[j].setText(paramsValue.elementAt(j).toString());
panelParameters[j].add(textFieldParameters[j]);
textFieldParameters[j].setBackground(fgColor);
textFieldParameters[j].addKeyListener(this);
labelComments[j] = new Label();
labelComments[j].setText((String)paramsComment.elementAt(j));
panelParameters[j].add(labelComments[j]);
labelComments[j].setForeground(fgColor);
add(scrollPaneParams);
panelHelp = new Panel();
labelHelp = new Label();
panelHelp.setLayout(new FlowLayout(1, 5, 0));
add(panelHelp);
panelHelp.setBackground(bgColor);
labelHelp.setText(" Change colour values and press enter ");
labelHelp.setAlignment(1);
panelHelp.add(labelHelp);
labelHelp.setForeground(helpColor);
return null;
private String readParams(String string1)
Object object1;
String string2;
if (string1 == null)
return "Filename of filter's parameters needed";
try
URL uRL = new URL(getDocumentBase(), string1);
URLConnection uRLConnection = uRL.openConnection();
uRLConnection.setDoInput(true);
uRLConnection.setUseCaches(false);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(uRLConnection.getInputStream()));
string2 = null;
catch ()
return object1.getMessage();
catch ()
return object1.getMessage();
catch ()
return object1.getMessage();
if (bufferedReader != null)
Object object2;
try
for (object2 = bufferedReader.readLine(); object2 != null && string2 == null; object2 = bufferedReader.readLine())
string2 = extractFormat(object2);
catch ()
string2 = object2.getMessage();
finally
bufferedReader.close();
if (string2 != null)
return string2;
else
return null;
private String extractFormat(String string1)
if (string1.length() == 0)
return null;
int i = 0;
int j = string1.indexOf(" ", i);
if (j == -1)
return "Bad format error (space missing)";
String string2 = string1.substring(i, j);
if (string2.equals("TITLE"))
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in TITLE missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in TITLE missing)";
title = string1.substring(i, j);
return null;
if (string2.equals("ORIGINALCAPTION"))
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in ORIGINALCAPTION missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in ORIGINALCAPTION missing)";
originalCaption = string1.substring(i, j);
return null;
if (string2.equals("FILTEREDCAPTION"))
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in FILTEREDCAPTION missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in FILTEREDCAPTION missing)";
filteredCaption = string1.substring(i, j);
return null;
if (string2.equals("LOGO"))
i = j + 1;
j = string1.length();
logoFileName = string1.substring(i, j);
return null;
if (string2.equals("ORIGINALIMAGE"))
i = j + 1;
j = string1.length();
originalImageFileName = string1.substring(i, j);
return null;
if (!string2.equals("PARAM"))
return null;
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format in a PARAM line";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format in a PARAM line";
paramsName.addElement(string1.substring(i, j));
i = j + 2;
j = string1.indexOf(32, i);
if (j == -1)
return "Bad format in a PARAM line";
try
paramsValue.addElement(new Double(string1.substring(i, j)));
j = string1.indexOf(34, i);
catch (NumberFormatException e)
return "Bad format in a PARAM line";
if (j == -1)
return "Bad format (Double quote in PARAM comment missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in PARAM comment missing)";
paramsComment.addElement(string1.substring(i, j));
return null;
public EasyFilter()
logoHeight = 33;
Yspc = 5;

Addition to my above submission
To clarify, I'll offer the US$20 to the FIRST person who offers me a workable solution to the problem, not to everyone!!!
JMGRAHAM

JavaScript calls method on Java Applet-- Problem

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