Browser focus problem

Hello.
We have a problem with focus on our web forms.
In our form we have one button. When the user clicks on the button, cursor appears in one item.
But when the user clicks outside the form (but still inside browser) and then back on the form, cursor is not visible. And if the user then clicks on the button, cursor is still not visible. Only when the user clicks into the item manually cursor appears.
Annoying.
Is there any solution for this?
Thanks.

a known forms focusing problem is fixed with SUN JRE 1.5_12. Also try to use the latest JInitiator if you don't want to use SUN JRE (on unix clients, you don't have any other option but to use SUN JRE). I recommend using Firefox on both unix and windows clients.
I hope this proves useful.

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An example of this would be my typing to post a message in this forum. Something occurs in the Verizon Access Manager and my typing is rendered useless unless I click with my mouse on the browser window to be able to use it again.
I'm highly suspecting whenever networks are coming and going in the Access Manager is when the problem occurs.
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Reader X - Firefox focus problem

Since I first started using Adobe Reader X, I have had an intermittent keyboard focus problem with Firefox (mostly recently 3.6.14, on Windows 7). If I open a PDF document in a browser tab, sometimes keyboard focus is not returned to Firefox iteself. For instance, I may try to type something into the Firefox search box or URL box, but cannot get keyboard focus there: I cannot get a blinking cursor, though I can select the text there.
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I don't know that "focus" is the right term to use, but I have the same exact problem. Do you have a scroll mouse? I've also noticed that when I scroll within an instance of Adobe Reader that's opened in Firefox using the scroll button on my mouse that the scroll bar does not register the change until I move my cursor over it, then the bar will jump to where it's supposed to be. This is really annoying because I can't quickly judge how far along I am in a .pdf.

Focus Problem on Solaris with jdk 1.3.1

Hi all,
We are having a focus problem on Solaris. The same code works fine on Windows without any problem.
I am sending the test code and run steps below which you can compile and repeat the problem.
NOTE: When we put a comment on the line "f1.requestFocus();" in TestFocus.java it works OK.
Run Steps :
1. Run TestFocus.class
2. A JFrame appears with 2 text field and a button
3. Try to write something on the text fields. It works OK.
4. Click the button to open a new JFrame
5. A new JFrame opens with a single text field and a button.
6. Click the button to close the second frame
7. You are now on the main JFrame
8. Try to write something on the text fields. It works OK.
9. Repeat the steps 4-7
10. Try to write something on the text fields. You are able to focus and write on the first field. BUT you cannot select or write the second Field!
JAVA SOURCE FILES :
PenHesapListener.java :
public interface PenHesapListener extends java.util.EventListener {
void tamam_actionPerformed(java.util.EventObject newEvent);
void iptal_actionPerformed(java.util.EventObject newEvent);
------PenHesapLisEventMulticaster.java----------------------------------
public class PenHesapLisEventMulticaster extends java.awt.AWTEventMulticaster implements PenHesapListener {
* Constructor to support multicast events.
* @param a java.util.EventListener
* @param b java.util.EventListener
protected PenHesapLisEventMulticaster(java.util.EventListener a, java.util.EventListener b) {
     super(a, b);
* Add new listener to support multicast events.
* @return muhasebe.HesappenListener
* @param a muhasebe.HesappenListener
* @param b muhasebe.HesappenListener
public static PenHesapListener add(PenHesapListener a, PenHesapListener b) {
     return (PenHesapListener)addInternal(a, b);
* Add new listener to support multicast events.
* @return java.util.EventListener
* @param a java.util.EventListener
* @param b java.util.EventListener
protected static java.util.EventListener addInternal(java.util.EventListener a, java.util.EventListener b) {
     if (a == null) return b;
     if (b == null) return a;
     return new PenHesapLisEventMulticaster(a, b);
* @return java.util.EventListener
* @param oldl muhasebe.HesappenListener
protected java.util.EventListener remove(PenHesapListener oldl) {
     if (oldl == a) return b;
     if (oldl == b) return a;
     java.util.EventListener a2 = removeInternal(a, oldl);
     java.util.EventListener b2 = removeInternal(b, oldl);
     if (a2 == a && b2 == b)
          return this;
     return addInternal(a2, b2);
* Remove listener to support multicast events.
* @return muhasebe.HesappenListener
* @param l muhasebe.HesappenListener
* @param oldl muhasebe.HesappenListener
public static PenHesapListener remove(PenHesapListener l, PenHesapListener oldl) {
     if (l == oldl || l == null)
          return null;
     if(l instanceof PenHesapLisEventMulticaster)
          return (PenHesapListener)((PenHesapLisEventMulticaster) l).remove(oldl);
     return l;
public void tamam_actionPerformed(java.util.EventObject newEvent) {
     ((PenHesapListener)a).tamam_actionPerformed(newEvent);
     ((PenHesapListener)b).tamam_actionPerformed(newEvent);
public void iptal_actionPerformed(java.util.EventObject newEvent) {
     ((PenHesapListener)a).iptal_actionPerformed(newEvent);
     ((PenHesapListener)b).iptal_actionPerformed(newEvent);
---------TestFocus2.java-----------------------------------------
import javax.swing.*;
import javax.swing.JOptionPane;
import java.awt.event.WindowAdapter;
import java.awt.event.KeyListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.ActionEvent;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.text.SimpleDateFormat;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.Color;
import java.util.Locale;
import java.util.ResourceBundle;
public class TestFocus2 extends JFrame implements ActionListener
     protected transient PenHesapListener PenhListener = null ;
     JTextField f10 = null;
     JButton b10= null ;
     JTextField f1 = new JTextField() ;
     JButton b1 = new JButton() ;
     JFrame f20 = null;
     public TestFocus2()
          getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
          getContentPane().add(f1);
          getContentPane().add(b1);
          pack();
          setVisible(true);
          b1.addActionListener(this);
     public void actionPerformed(ActionEvent e)
          if(e.getSource() == b1)
               fireTamam_actionPerformed(e);
     public void addPenHesapListener(PenHesapListener newListener)
          PenhListener = PenHesapLisEventMulticaster.add(PenhListener, newListener);
          return;
     protected void fireTamam_actionPerformed(java.util.EventObject newEvent) {
          PenhListener.tamam_actionPerformed(newEvent);
          this.setVisible(false);
     protected void fireiptal_actionPerformed(java.util.EventObject newEvent) {
          PenhListener.iptal_actionPerformed(newEvent);
     public static void main(String x[])
          TestFocus2 gen01 = new TestFocus2();
--------TestFocus.java-----------------------------------
import javax.swing.*;
import javax.swing.JOptionPane;
import java.awt.event.WindowAdapter;
import java.awt.event.KeyListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.ActionEvent;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.text.SimpleDateFormat;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.Color;
import java.util.Locale;
import java.util.ResourceBundle;
import java.awt.Container;
public class TestFocus extends JFrame implements ActionListener
     PenKreKart aPenKreKart = null ;
     Container ctn = null;
     JTextField f10 = null;
     JButton b10= null ;
     JTextField f1 = new JTextField() ;
     JTextField f2 = new JTextField() ;
     JButton b1 = new JButton() ;
     JFrame f20 = null;
     public TestFocus()
          //aPenKreKart = new PenKreKart(true);
          //aPenKreKart.aTemelPencere.setVisible(false);
          getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
          getContentPane().add(f1);
          getContentPane().add(f2);
          getContentPane().add(b1);
          pack();
          setVisible(true);
          b1.addActionListener(this);
     public void actionPerformed(ActionEvent e)
          if(e.getSource() == b1)
               pencere_islemi();
     // pencere koyma k?sm? .. begin
     public void pencere_islemi() {
          ctn = this;
          ctn.setEnabled(false);
          TestFocus2 fpen = new TestFocus2();
          //aPenKreKart.aTemelPencere.setVisible(true); //buras?
          //aPenKreKart.aTemelPencere.addPenHesapListener(new PenHesapListener() {
          fpen.addPenHesapListener(new PenHesapListener() {
                    // metod      tamam_actionPerformed begin...
                    public void tamam_actionPerformed(java.util.EventObject newEvent) {
                         ctn.setEnabled(true);
                         ctn.requestFocus();
                         // Problem is when we comment the below line it works .....
                         f1.requestFocus();
                         System.out.println("tamam");
                    // metod      tamam_actionPerformed end...
                    // metod      iptal_actionPerformed begin...
                    public void iptal_actionPerformed(java.util.EventObject newEvent) {
                         ctn.setEnabled(true);
                         ctn.requestFocus();
                         System.out.println("iptal");
                    // metod      iptal_actionPerformed begin...
     // pencere koyma k?sm? .. end
     public static void main(String x[])
          TestFocus gen01 = new TestFocus();

Hi all,
We are having a focus problem on Solaris. The same code works fine on Windows without any problem.
I am sending the test code and run steps below which you can compile and repeat the problem.
NOTE: When we put a comment on the line "f1.requestFocus();" in TestFocus.java it works OK.
Run Steps :
1. Run TestFocus.class
2. A JFrame appears with 2 text field and a button
3. Try to write something on the text fields. It works OK.
4. Click the button to open a new JFrame
5. A new JFrame opens with a single text field and a button.
6. Click the button to close the second frame
7. You are now on the main JFrame
8. Try to write something on the text fields. It works OK.
9. Repeat the steps 4-7
10. Try to write something on the text fields. You are able to focus and write on the first field. BUT you cannot select or write the second Field!
JAVA SOURCE FILES :
PenHesapListener.java :
public interface PenHesapListener extends java.util.EventListener {
void tamam_actionPerformed(java.util.EventObject newEvent);
void iptal_actionPerformed(java.util.EventObject newEvent);
------PenHesapLisEventMulticaster.java----------------------------------
public class PenHesapLisEventMulticaster extends java.awt.AWTEventMulticaster implements PenHesapListener {
* Constructor to support multicast events.
* @param a java.util.EventListener
* @param b java.util.EventListener
protected PenHesapLisEventMulticaster(java.util.EventListener a, java.util.EventListener b) {
     super(a, b);
* Add new listener to support multicast events.
* @return muhasebe.HesappenListener
* @param a muhasebe.HesappenListener
* @param b muhasebe.HesappenListener
public static PenHesapListener add(PenHesapListener a, PenHesapListener b) {
     return (PenHesapListener)addInternal(a, b);
* Add new listener to support multicast events.
* @return java.util.EventListener
* @param a java.util.EventListener
* @param b java.util.EventListener
protected static java.util.EventListener addInternal(java.util.EventListener a, java.util.EventListener b) {
     if (a == null) return b;
     if (b == null) return a;
     return new PenHesapLisEventMulticaster(a, b);
* @return java.util.EventListener
* @param oldl muhasebe.HesappenListener
protected java.util.EventListener remove(PenHesapListener oldl) {
     if (oldl == a) return b;
     if (oldl == b) return a;
     java.util.EventListener a2 = removeInternal(a, oldl);
     java.util.EventListener b2 = removeInternal(b, oldl);
     if (a2 == a && b2 == b)
          return this;
     return addInternal(a2, b2);
* Remove listener to support multicast events.
* @return muhasebe.HesappenListener
* @param l muhasebe.HesappenListener
* @param oldl muhasebe.HesappenListener
public static PenHesapListener remove(PenHesapListener l, PenHesapListener oldl) {
     if (l == oldl || l == null)
          return null;
     if(l instanceof PenHesapLisEventMulticaster)
          return (PenHesapListener)((PenHesapLisEventMulticaster) l).remove(oldl);
     return l;
public void tamam_actionPerformed(java.util.EventObject newEvent) {
     ((PenHesapListener)a).tamam_actionPerformed(newEvent);
     ((PenHesapListener)b).tamam_actionPerformed(newEvent);
public void iptal_actionPerformed(java.util.EventObject newEvent) {
     ((PenHesapListener)a).iptal_actionPerformed(newEvent);
     ((PenHesapListener)b).iptal_actionPerformed(newEvent);
---------TestFocus2.java-----------------------------------------
import javax.swing.*;
import javax.swing.JOptionPane;
import java.awt.event.WindowAdapter;
import java.awt.event.KeyListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.ActionEvent;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.text.SimpleDateFormat;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.Color;
import java.util.Locale;
import java.util.ResourceBundle;
public class TestFocus2 extends JFrame implements ActionListener
     protected transient PenHesapListener PenhListener = null ;
     JTextField f10 = null;
     JButton b10= null ;
     JTextField f1 = new JTextField() ;
     JButton b1 = new JButton() ;
     JFrame f20 = null;
     public TestFocus2()
          getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
          getContentPane().add(f1);
          getContentPane().add(b1);
          pack();
          setVisible(true);
          b1.addActionListener(this);
     public void actionPerformed(ActionEvent e)
          if(e.getSource() == b1)
               fireTamam_actionPerformed(e);
     public void addPenHesapListener(PenHesapListener newListener)
          PenhListener = PenHesapLisEventMulticaster.add(PenhListener, newListener);
          return;
     protected void fireTamam_actionPerformed(java.util.EventObject newEvent) {
          PenhListener.tamam_actionPerformed(newEvent);
          this.setVisible(false);
     protected void fireiptal_actionPerformed(java.util.EventObject newEvent) {
          PenhListener.iptal_actionPerformed(newEvent);
     public static void main(String x[])
          TestFocus2 gen01 = new TestFocus2();
--------TestFocus.java-----------------------------------
import javax.swing.*;
import javax.swing.JOptionPane;
import java.awt.event.WindowAdapter;
import java.awt.event.KeyListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.ActionEvent;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.text.SimpleDateFormat;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.Color;
import java.util.Locale;
import java.util.ResourceBundle;
import java.awt.Container;
public class TestFocus extends JFrame implements ActionListener
     PenKreKart aPenKreKart = null ;
     Container ctn = null;
     JTextField f10 = null;
     JButton b10= null ;
     JTextField f1 = new JTextField() ;
     JTextField f2 = new JTextField() ;
     JButton b1 = new JButton() ;
     JFrame f20 = null;
     public TestFocus()
          //aPenKreKart = new PenKreKart(true);
          //aPenKreKart.aTemelPencere.setVisible(false);
          getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
          getContentPane().add(f1);
          getContentPane().add(f2);
          getContentPane().add(b1);
          pack();
          setVisible(true);
          b1.addActionListener(this);
     public void actionPerformed(ActionEvent e)
          if(e.getSource() == b1)
               pencere_islemi();
     // pencere koyma k?sm? .. begin
     public void pencere_islemi() {
          ctn = this;
          ctn.setEnabled(false);
          TestFocus2 fpen = new TestFocus2();
          //aPenKreKart.aTemelPencere.setVisible(true); //buras?
          //aPenKreKart.aTemelPencere.addPenHesapListener(new PenHesapListener() {
          fpen.addPenHesapListener(new PenHesapListener() {
                    // metod      tamam_actionPerformed begin...
                    public void tamam_actionPerformed(java.util.EventObject newEvent) {
                         ctn.setEnabled(true);
                         ctn.requestFocus();
                         // Problem is when we comment the below line it works .....
                         f1.requestFocus();
                         System.out.println("tamam");
                    // metod      tamam_actionPerformed end...
                    // metod      iptal_actionPerformed begin...
                    public void iptal_actionPerformed(java.util.EventObject newEvent) {
                         ctn.setEnabled(true);
                         ctn.requestFocus();
                         System.out.println("iptal");
                    // metod      iptal_actionPerformed begin...
     // pencere koyma k?sm? .. end
     public static void main(String x[])
          TestFocus gen01 = new TestFocus();

Oracle 10g express edition browser login problem

Hi
I installed oracle 10g express edition and after installing successfully logged in browser , unlocked hr login and also created one form then I shutdown the database and rebooted my pc and since then when I try to login to "go to Database Home page" after starting database , I get a cookie 127.0.0.1 with username and password, First of all I am not sure what username/password it is expecting, I believe it requires my Windows XP username and password , I tried to enter couple of times my pc login username which has administrator privileges, I also checked it has ora_dba group but after entering pc username , password browser opens saying "unauthorized". I created another os user and tried with that still same. I tried entering oracle password "SYSTEM" and password for it but still could not login, I tried HR username password still nothing.
I tried disabling firewall but still same issue. I tried to re-install two time but still same .
Start database dos prompt does show all the process are started successfully .
I also did ping for 127.0.0.1 and it does ping.
I tried everything what I knew.
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Hi
This is how I resolved the browser login problem .
I checked the listener log
C:\OracleXE\app\oracle\product\10.2.0\server\NETWORK\log
And found the error
TNS-12542: TNS:address already in use
TNS-12560: TNS:protocol adapter error
TNS-00512: Address already in use
I have another version for oracle installed on my pc .
I ended both the oracle process (Oracle.exe) through the Task Manager
Then manually started OracleServiceXe service through Component Services
Control Panel Performance & Maintenance Administrative Component Services
Then did following
Programs Oracle Database10g ExpressEdition Start Database
Programs Oracle Databse10g ExpressEdition Go to Database Homepage
Enter username SYSTEM
Enter password xxxxxx whatever given at the time of installing.
And I did successfully login to the browser .
Hope this will help to those of you who have run into similar problem which I faced
Good Luck .
A. Patil

Calling1.4.1 signed applet from Javascript causes keyboard/focus problems

Pretty sure there's a JRE bug here, but I'm posting to forums before I open one in case I'm missing something obvious :-)
This issue may be specific to IE, I haven't tested elsewhere yet. Our web application is centered around a signed applet that is initialized with XML data via Javascript. We first noticed the problem when our users started upgrading from the 1.3.x plug-in to the 1.4.x plug-in. The major symptom was that shortcut keys stopped working. I debugged the problem off and on for about a month before I boiled it down to a very simple program that demonstrates the issue (included below). Basically, the program has a function that adds a JButton to a JPanel and registers a keyboard listener (using the new DefaultKeyboardFocusManager class) that prints a message to the console. This function is called by the applet's init() method, as well as by a public method that can be called from Javascript (called callMeFromJavascript()). I also included a very simple HTML file that provides a button that calls the callMeFromJavascript() method. You can test this out yourself: To recreate, compile the class below, JAR it up, sign the JAR, and put in the same dir with the HTML file. Load the HTML file in IE 5.0 or greater, and bring the console up in a window right next to it. Now click the button that says init--you should see the small box appear inside the button that indicates it has the focus. Now press some keys on your keyboard. You should see "KEY PRESSED!!!" appearing in the console. This is proper behavior. Now click the Init Applet from Javascript button. It has removed the button called init, and added one called "javascript". Press this button. Notice there is no focus occurring. Now press your keyboard. No keyboard events are registered.
Where is gets interesting is that if you go back and make this an unsigned applet, and try it again, everything works fine. This bug only occurs if the applet is signed.
Furthermore, if you try it in 1.3, signed or unsigned, it also works. So this is almost certainly a 1.4 bug.
Anyone disagree? Better yet, anyone have a workaround? I've tried everything I could think of, including launching a thread from the init() method that sets up the components, and then just waits for the data to be set by Javascript. But it seems that ANY communication between the method called by Javascript and the code originating in init() corrupts something and we don't get keyboard events. This bug is killing my users who are very reliant on their shortcut keys for productivity, and we have a somewhat unique user interface that relies on Javascript for initialization. Any help or suggestions are appreciated.
================================================================
Java Applet (Put it in a signed JAR called mainapplet.jar)
================================================================
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MainApplet extends JApplet implements KeyEventDispatcher
    JPanel test;
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        System.out.println("init called");
        setUp("init");
    public void callMeFromJavascript()
        System.out.println("callMeFromJavascript called");
        setUp("javascript");
    private void setUp(String label)
        getContentPane().removeAll();
        test = new JPanel();
        getContentPane().add( test );
        JButton button = new JButton(label);
        test.add( button );
        test.updateUI();
        DefaultKeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(this);
    public boolean dispatchKeyEvent(KeyEvent e)
        System.out.println("== KEY PRESSED!!! ==");
        return false;
}================================================================
HTML
================================================================
<form>
<APPLET code="MainApplet" archive="mainapplet.jar" align="baseline" id="blah"
     width="200" height="400">
     No Java 2 SDK, Standard Edition v 1.4.1 support for APPLET!!
</APPLET>
<p>
<input type="button" onClick="document.blah.callMeFromJavascript();" value="Init Applet via Javascript">
</form>

I tried adding the requestFocus() line you suggested... Same behavior.
A good thought, but as I mention in my description, the applet has no trouble gaining the focus initially (when init() is called). From what I have seen, it is only when the call stack has been touched by Javascript that I see problems. This is strange though: Your post gave me the idea of popping the whole panel into a JFrame... I tried it, and the keyboard/focus problem went away! It seems to happen only when the component hierarchy is descended from the JApplet's content pane. So that adds yet another variable: JRE 1.4 + Signed + Javascript + components descended from JApplet content pane.
And yes, signed or unsigned DOES seem to make a difference. Don't ask me to explain why, but I have run this little applet through quite a few single variable tests (change one variable and see what happens). The same JAR that can't receive keyboard events when signed, works just fine unsigned. Trust me, I'm just as baffled as you are.

Focus problem since jre 1.4.2_11

Hi,
I have a awkward focus problem with my java applet. Everything is working fine for jre 1.4.2_10 and all older jre.
The applet is embedded in a large DHTML application running in a shell which uses the internet explorer for rendering. The applet communicates with the sorrounding java script via LiveConnect (JSObjects). We do use the static versioning, in order to determine the adaequate vm version. The controls are all based upon the swing controls, some are a bit modified.
Since the introduction of jre 1.5 update 6 the static versioning does no longer work properly. So, when I run my applet with 1.4.2_11 and all the predecessors a strange focus problem occurs.
When I click outside the applet (focus lost) and the click on a jscript control to get back the focus to the applet, the keyboard input does not reach the applet. The comboboxes do not work anymore. A mouse click is recognized, but the data-list which should appear is only flickering for a moment.
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Does anyone has an idea, has seen similar effects or knows what has been changed in the jre between 1.4.2_10 and 1.4.2_11 ??
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cheers thorsten

Two things: Is there a document detailing manual removal of this JRE (and indeed others); you mention different 'builds' of the same JRE, this is the first time I have read that there are sub-versions/releases of a JRE. Where do I find out the available builds of this JRE and others and how they differ?

Browser display problem in firefox

After reinstall Vibe 3.3 to new server. Browser display problem in firefox. Last column only display half in the table. But IE is display fine. Any suggestion?

Originally Posted by yuenc
Sorry that, our company no planning on upgrade.
And they said no problem before move to new server.
Then you could try the workaround mentioned in comment 6: https://bugzilla.novell.com/show_bug.cgi?id=786587#c6
According to the bug report it was found in 3.3, so either they had this problem before or they used an older version firefox than 16 prior to the server migration.
Thomas

Focus Problem on the t3i

My t3i is having focusing problems. What can be the cause? Can I fine to the focus like on the fullframe cameras?
Solved!
Go to Solution.

Kolourl3lind wrote:
OK I will but I just relized maybe it's because I am zooming after focusing and recomposing?
Yep - most lenses are "varifocal" -- meaning that if you carefully focus on a subject at some specific focal length in the zoom range... then zoom to a new focal length, then your subject will no longer be accurately focus. You must re-focus the lens.
There are a few lenses which are "parfocal" -- mean that if you zoom the focal length after focusing, your subject will still be accurately focused. However... VERY FEW lenses are technically "parfocal" (though some are close).
The lenses that I'm aware of which are "parfocal" are:
EF 16-135mm f/2.8L USM
EF 17-40mm f/4L USM
EF 70-200mm f/2.8L USM (only the non-IS version)
That's it. If you use any other lens, you have to re-focus the lens after zooming.
But I also notice you were shooting at 1/15th sec. That's a bit slow but you were at 18mm (which helps.) Here's the guideline on that.
In the 35mm days, there used to be a general guideline that if the shutter speed is equal to or faster than 1/focal-length (e.g. if shooting at 50mm the you'd want to be at least 1/50th sec.... at 70mm you'd want to be at least 1/70th or faster, etc.) would be adequate. This number doesn't apply to your T3i, but I'll get to that in a moment.
But there are a few caveats with that...
First, It assumes you are actually using very good camera-holding technique and you are actually TRYING to be steady. Good camera-holding technique means you are supporting the camera from below -- typically your left is palm-up supporting the bottom of the camera and lens and your elbow is in toward your chest/stomach. Your body weight is centered between your legs and you have a wide stance. This means you are not leaning so your muscles don't have to work hard to keep you upright and your arms work like a brace to support the camera to your body and of course your body is nicely balanced and stable.
Second, It's just a "guideline" -- not a rule. Some people are noticeably able to be more steady than others (and if caffiene makes you jittery and you just drank a coffee... and all that sort of thing.) And sometimes it takes a bit of practice to learn good technique.
Third, It's also not the same for APS-C size sensor cameras (like your T3i). For that camera, you'd have to multiple the minimum speed by the crop factor of the camera. For a Canon APS-C camera it's 1.6 (but if you wanted to use 1.5 that'd be pretty close.) That means at 50mm instead of using 1/50th you'd actually have to use 1/75th (technically 1/80th if we use the 1.6 factor). e.g. 50 x 1.6 = 80 so for 50mm we'd use 1/80th.
If you have a lens that includes image stabilization, then you may be able to shoot a bit slower.
Most image stabilization claims to improve lens stability by 2 to 4 "stops". What that means it that you can reduce the speed of the shutter... two to four times slower than you'd normally need because the lens is stabilizing for you. But more caveats apply because it's not as simple as "you get 4 stops". The stabilization isn't a guarantee... it's just a liklihood. If it has to be less ambitious to stabilize your shot it will be far more likely to succeed. If it has to be more ambitious to stabilize your shot then it'll do it's best... but there's no guarantee that it will work.
You were shooting at 18mm. So if you are using excellent posture and camera-holding technique but don't have image stabilization and you're the "average" person trying to hold the camera steady, then we multiply 18 x 1.6 and get 28.8. There is no 1/28.8th shuter speed so we'll round that to 1/30th (because there is a 1/30th.
1 stop slower than 1/30th is 1/15th.. and the image stabilization probably is adequate to get you 1 stop slower successfully.
2 stops slower is 1/8th. Image stabilization that claims "4 stops" will usually do well at 2 stops. So this is less of a sure-fire thing, but it does tilt the odds in your favor.
3 stops slower is 1/4 sec. At this point you're pushing the image stabilization system... you'll notice that if you shoot a lot of frames, that the "keeper" rate (good shots you like) will be lower, but you'll see that you are getting some.
4 stops slower is 1/2 sec (based on the base of 1/30th for an 18mm focal length on an APS-C size sensor camera). If you push any image stabilized lens to 4 stops, do not expect to get a very high keeper rate. It'll sometimes help you, but you have to accept that you're really being ambitious in your expectations.
That's image stabilization by the numbers... take the focal length, multiply it by your crop factor (which is always 1.6 but if you want to use 1.5 because it's a bit easier to do that math in our head it's close enough), round up to the nearest shutter speed available. If you have image stabilization you can speed up the shutter speed by 1, 2, 3, or 4 times faster... but each time you get more ambitious your odds of getting "keepers" go down (but it's still better than no image stabilization at all.)
The summary is that your minimum shutter speed (assuming good holding technique and that you are steady, etc. etc.) with image stabilization OFF the 1/30th would be your minimum speed. At 1/15h sec you were relying on 1 stop of image stabilization help. The image stabilization technology in the lens is good enought that "most of the time" it probably will be able to do this (not guaranteed... just likely.) If you were NOT using good posture and holding technique... you may be challenging your image stabilization system to try to keep up.
Tim Campbell
5D II, 5D III, 60Da

Focus problems

for some reason my canon is having focus problems even on auto focus..what is going on??

Yes, a lot of your problem focusing could simply be that you are trying to use the camera in too low light, if shooting indoors. It will vary depending upon the camera and the lens being used on the camera. There are some ways to get focus to work, such as using an accessory flash (or ST-E2 flash controller) that can emit a Focus Assist (as Tim mentioned in his response above).
But, not knowing your experience with the camera and autofocus cameras in general, I first have to suggest some general info on autofocus and how it works....
This video on YouTube is a good place to start: http://www.youtube.com/watch?v=iAx86nblZ2g. This is the first of three half-hour videos about how the Canon AF system works. Good background info to start with. I'd recommend viewing them all, then you may be able to solve the problem yourself.
Alan Myers
San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
FLICKR & PRINTROOM

Weird focus problems (& 1 workaround)

I am building a wizard with an extension of JDialog. Based on earlier input, I create the JDialog with a bunch of JPanels each with a combobox and a textfield. I have a next, cancel, and back button at the bottom on its own panel. I also have a "Finish" button when I reach the last panel. So I have to change the buttonPanel by putting the finish button on at the end and I put the next button back on when coming back from the last panel.
The problems I have been running into involve getting focus to one of the JTextfields mentioned above. I had a problem when I built my JDialog after clicking the next button. I removed everything from my ContentPane (cp) using cp.removeAll(). After building my JDialog, my code trys to give focus to the first text field. It wouldn't. I tested the text field and it is indeed focusable, visible, and displayable.
The fix was removing each individual component from the content pane instead of doing the removeAll(). Then, after adding everything to the content pane, my textfield could grab the focus.
The only problem that remains is with the back button. When I move back from the final panel the following code is executed:
buttonPanel.removeAll();
//buttonPanel.remove(backButton);
//buttonPanel.remove(finalButton);
//buttonPanel.remove(cancelButton);
buttonPanel.add(backButton);
buttonPanel.add(nextButton);
buttonPanel.add(cancelButton);
Then, as in other cases, the buttonPanel object is added to the content pane. This causes the textfield to be unable to grab focus. I commented out the code and the focus worked fine (but of course my buttonPanel was not correct).
This is happening with 1.4.1 on windows 2000. I don't have another computer to test this one.
Am I doing something inherently wrong or is this a bug?
I've looked around and there are a lot of problems reported with focus and swing, but I wasn't sure if this was a symptom of those problems or if this is something different.
I appreciate any help you can give.
thanks,
Geoff

I won't throw everything at you but this should be plenty. If anyone needs any explanations I am not going anywhere. I'm trying to figure out if the problem is a bug or not.
The workaround is mentioned in a comment for the action listener of nextButton. The problem piece of code that is mentioned at the top of this thread is also commented and it is part of the action listener for backButton.
There are some declarations I have left out and I've left out some helper functions and some private classes, but I looked at it closely. There shouldn't be anything that is a mystery here. But, again, if anything is unclear just give a shout.
thanks in advance,
Geoff
public InfoDialog(JFrame owner, int[] results)
     super(owner, "Wizard", true);
     cp = getContentPane();
     this.owner = owner;
     answers = results;
     lastPanel = answers.length-1;
     //figure out number of panels and last one greater than 0
     for(int i =0; i<answers.length; i++)
          numPanels++;
          if(answers>0)
               lastPanel = i;
     if(numPanels==0)
          return;
     nameVectors = new Vector[answers.length];
     typeVectors = new Vector[answers.length];
     while(answers[currentPanel]<=0 && currentPanel<answers.length)
          currentPanel++;
     firstPanel = currentPanel;
     inputLabel = new JLabel();
     inputLabel.setAlignmentX(Component.CENTER_ALIGNMENT);
     inputLabel.setText(getInputLabelText(currentPanel));
     panelArray = new JPanel[answers[currentPanel]];
     nameVectors[currentPanel] = new Vector();
     typeVectors[currentPanel] = new Vector();
     comboArray = new ClassComboBox[answers[currentPanel]];
     textArray = new StringTextField[answers[currentPanel]];
     for(int i=0; i<panelArray.length; i++)
          panelArray[i] = new JPanel();
          panelArray[i].setLayout(new BoxLayout(panelArray[i], BoxLayout.X_AXIS));
          comboArray[i] = new ClassComboBox();
          panelArray[i].add(comboArray[i]);
          textArray[i] = new StringTextField(new String(""));
          panelArray[i].add(textArray[i]);
     cp.setLayout(new BoxLayout(cp, BoxLayout.Y_AXIS));
     //cp.add(infoPanel);
     cp.add(inputLabel);
     for(int i=0; i<panelArray.length; i++)
          cp.add(panelArray[i]);
     //infoPanel = new JPanel();
     //infoPanel.setLayout(new BoxLayout(infoPanel, BoxLayout.X_AXIS));
     //infoPanel.add(new ClassComboBox());
     //infoPanel.add(new StringTextField(new String("")));
     //cp.add(infoPanel);
     backButton = new JButton("Back");
     backButton.setEnabled(false);
     backButton.addActionListener(new ActionListener(){
          public void actionPerformed(ActionEvent ae){
               //save values of previous panel into vector
               typeVectors[currentPanel] = null;
               nameVectors[currentPanel] = null;
               typeVectors[currentPanel] = new Vector();
               nameVectors[currentPanel] = new Vector();
               for(int i=0; i<panelArray.length; i++)
                    typeVectors[currentPanel].add((String)comboArray[i].getSelectedItem());
                    nameVectors[currentPanel].add(textArray[i].getText());
               //remove everything from JDialog
               //cp.removeAll();
               cp.remove(inputLabel);
               for(int i=0; i<panelArray.length; i++)
                    cp.remove(panelArray[i]);
               cp.remove(buttonPanel);
               //store last panel, figure out what the new currentPanel val is
               int previousPanel = currentPanel;
               currentPanel--;
               while(answers[currentPanel]<=0 && currentPanel >= firstPanel)
                    currentPanel--;
               //go through panelArray getting rid of its subcomponents
               for(int i=0; i<panelArray.length; i++)
                    panelArray[i].removeAll();
               panelArray = null;
               comboArray = null;
               textArray = null;
               //arrays will be initialized to the appropriate length for the currentPanel
               panelArray = new JPanel[answers[currentPanel]];
               comboArray = new ClassComboBox[answers[currentPanel]];
               textArray = new StringTextField[answers[currentPanel]];
               //inputLabel.setText(pinTypes[currentPanel]);
               inputLabel.setText(getInputLabelText(currentPanel));
               cp.add(inputLabel);
               for(int i=0; i<panelArray.length; i++)
                    panelArray[i] = new JPanel();
                    panelArray[i].setLayout(new BoxLayout(panelArray[i], BoxLayout.X_AXIS));
                    comboArray[i] = new ClassComboBox();
                    comboArray[i].setSelectedItem(typeVectors[currentPanel].get(i));
                    panelArray[i].add(comboArray[i]);
                    //textArray[i] = new StringTextField(new String(""));
                    textArray[i] = new StringTextField((String)nameVectors[currentPanel].get(i));
                    panelArray[i].add(textArray[i]);
                    cp.add(panelArray[i]);
               //focus problem is caused by this block of code
               //moving back from last panel
               if((currentPanel == lastPanel-1) && previousPanel==lastPanel)
                    buttonPanel.removeAll();
                    //the following code did not fix the problem
                    //buttonPanel.remove(backButton);
                    //buttonPanel.remove(finalButton);
                    //buttonPanel.remove(cancelButton);
                    buttonPanel.add(backButton);
                    buttonPanel.add(nextButton);
                    buttonPanel.add(cancelButton);
               if(currentPanel==firstPanel)
                    backButton.setEnabled(false);
               cp.add(buttonPanel);
               //System.out.println();
               //System.out.println("textArray[0].isVisibile: " + textArray[0].isVisible());
               //System.out.println("textArray[0].isDisplayable: " + textArray[0].isDisplayable());
               //System.out.println("textArray[0].isFocusable: " + textArray[0].isFocusable());
               //textArray[0].grabFocus();
               pack();
               //repaint();
               System.out.println();
               System.out.println("textArray[0].isVisibile: " + textArray[0].isVisible());
               System.out.println("textArray[0].isDisplayable: " + textArray[0].isDisplayable());
               System.out.println("textArray[0].isFocusable: " + textArray[0].isFocusable());
               textArray[0].grabFocus();
     nextButton = new JButton("Next");
     nextButton.addActionListener(new ActionListener(){
          public void actionPerformed(ActionEvent ae){
               //logic to grab information from JComboBox and JTextField
               typeVectors[currentPanel] = null;
               nameVectors[currentPanel] = null;
               typeVectors[currentPanel] = new Vector();
               nameVectors[currentPanel] = new Vector();
               for(int i=0; i<panelArray.length; i++)
                    typeVectors[currentPanel].add((String)comboArray[i].getSelectedItem());
                    nameVectors[currentPanel].add(textArray[i].getText());
               //here is the code that didn't work and the subsequent code
               //that fixed the problem
               //cp.removeAll();
               cp.remove(inputLabel);
               for(int i=0; i<panelArray.length; i++)
                    cp.remove(panelArray[i]);
               cp.remove(buttonPanel);
               currentPanel++;
               //System.out.println("currentPanel prior to processing: " + currentPanel);
               if(currentPanel<(answers.length-1))
                    while(answers[currentPanel]<=0 && currentPanel<lastPanel)
                         currentPanel++;
               for(int i=0; i<panelArray.length; i++)
                    panelArray[i].removeAll();
                    //comboArray[i].removeAll();
                    //textArray[i].removeAll();
               panelArray = null;
               comboArray = null;
               textArray = null;
               panelArray = new JPanel[answers[currentPanel]];
               inputLabel.setText(getInputLabelText(currentPanel));
               cp.add(inputLabel);
               //test to see if this is the first time reaching this point
               //if you haven't reached this point before, vector will be null
               boolean firstTime = false;
               if(nameVectors[currentPanel]==null)
                    firstTime = true;
               if(firstTime)
                    nameVectors[currentPanel] = new Vector();
                    typeVectors[currentPanel] = new Vector();
               comboArray = new ClassComboBox[answers[currentPanel]];
               textArray = new StringTextField[answers[currentPanel]];
               //establish the proper # of combo boxes & text fields
               int len = panelArray.length;
               for(int i=0; i<len; i++)
                    panelArray[i] = new JPanel();
                    panelArray[i].setLayout(new BoxLayout(panelArray[i], BoxLayout.X_AXIS));
                    comboArray[i] = new ClassComboBox();
                    if(!firstTime)
                         comboArray[i].setSelectedItem(typeVectors[currentPanel].get(i));
                    panelArray[i].add(comboArray[i]);
                    textArray[i] = new StringTextField();
                    if(!firstTime)
                         textArray[i].setText((String)nameVectors[currentPanel].get(i));
                    panelArray[i].add(textArray[i]);
                    cp.add(panelArray[i]);
               if(currentPanel==lastPanel)
                    buttonPanel.removeAll();
                    buttonPanel.add(backButton);
                    buttonPanel.add(finalButton);
                    buttonPanel.add(cancelButton);
               backButton.setEnabled(true);
               cp.add(buttonPanel);
               //textArray[0].requestFocus();
               //System.out.println();
               //System.out.println("textArray[0].isVisibile: " + textArray[0].isVisible());
               //System.out.println("textArray[0].isDisplayable: " + textArray[0].isDisplayable());
               //System.out.println("textArray[0].isFocusable: " + textArray[0].isFocusable());
               //textArray[0].grabFocus();
               pack();
               //System.out.println();
               //System.out.println("textArray[0].isVisibile: " + textArray[0].isVisible());
               //System.out.println("textArray[0].isDisplayable: " + textArray[0].isDisplayable());
               //System.out.println("textArray[0].isFocusable: " + textArray[0].isFocusable());
               textArray[0].grabFocus();
     setLocationRelativeTo(owner);
     setVisible(true);

Camera (focus) problem - help?

Duplicate post, please see: Camera (focus) problem - help?
Message was edited by: Admin Moderator

Warranty is valid only in country of original purchase. You have to return
the iPhone to the US for evaluation. Either you return it personally or send
it to a friend/relative/co-worker in the US to take into Apple. Apple will not
accept international shipments for evaluation nor will Apple ship out of the
country after repair/replacement.
Have you tried the standard trouble shooting steps: restart, restore, restore
as new iPhone?

How to handle Back button, Browser Refresh problem at server side.

Hi Friends,
How to handle Back button, Browser Refresh problem at server side in java?.
I am able to trace that,
request.getHeader("ACCEPT") is returning value- */*
when the browser was refreshed and returning different MIME types
for all other actions from browser.
I have doubt, will the above solution works always for all servers,browsers?.
Please also specify any solution to handle back button at server side?.
Thanks in Advance.
Venkat..

I'm sorry I don't think tht's the right solution for
the above question....
We must be aware that whatever scripting methdologies
we either javascript/vbscript would executed @
client(browser) side not @ server side....
Dud If U get a good solution keep me updated.....
THANKS & REGARDS,
RAHULMy dear friend ...
the bad news is that u simply cant disable or add any listener to the back button of the browser.
When u hit the back button of ur browser the URL gets re-executed. So in case u have a JSP then the history.forward() is the best solution. [only if the page doesnt get expired similar to secure https sites]
Now dont say that user can have javascript disabled ...those users will have a pretty touch time browsing websites since javascripts r used extensively by almost all websites.
But in case u have an action.do or servlet call then u need to manage it using a session variable since the request will be sent to the server rather than client.
For multiple form submittion issues read the following article in javaworld...
Client vs. server solutions
Different solutions can solve this multiple form submission situation. Some transactional sites simply warn the user to wait for a response after submitting and not to submit twice. More sophisticated solutions involve either client scripting or server programming.
In the client-only strategy, a flag is set on the first submission, and, from then on, the submit button is disabled based on this flag. While appropriate in some situations, this strategy is more or less browser dependent and not as dependable as server solutions.
For a server-based solution, the Synchronizer Token pattern (from Core J2EE Patterns) can be applied, which requires minimal contribution from the client side. The basic idea is to set a token in a session variable before returning a transactional page to the client. This page carries the token inside a hidden field. Upon submission, request processing first tests for the presence of a valid token in the request parameter by comparing it with the one registered in the session. If the token is valid, processing can continue normally, otherwise an alternate course of action is taken. After testing, the token resets to null to prevent subsequent submissions until a new token is saved in the session, which must be done at the appropriate time based on the desired application flow of control.
for more details refer :
http://www.javaworld.com/javaworld/javatips/jw-javatip136.html
Hope u got the idea.
FYI I have been using both these ideas in my credit card payment gateway project. This concept has worked really well.

JBuilder .exe focus problem

I have a swing application of a JFrame with a JMenuBar and JTextfields, JButtons, etc... It works great as a standalone application, or when run as an executable .jar. The problem is when I use JBuilder 7 Native Executable Builder and make a .exe out of the application. It also works fine, but when I click on a JMenuItem that does not bring up a JDialog, just performs a function, it performs the function, but refuses thereafter to give focus to the JTextfields and JTextArea, unless I click on a JButton to bring up a JDialog or JFileChooser, close, then the JTextfields accept focus again (what a workaround!!).
I have added code for a JTextField to requestFocus, grabFocus after the function was performed, and even had the SwingFocusManager disabled, all of which still did not allow focus after the function was performed.
Once again, this is only in the .exe version of my application- the other "normal" ways run fine. Has anyone else had this problem? Has anyone thought up a solution, or is this just a JBuilder unfixable for their cool neat new feature??
Thanks for any ideas,
Jim

Well, your that did not work either. I think it is not anything to do with the code necessarily- as it is not always reproducible!!- The only commonality is that it occurs only with JBuilders .exe created from the source code- all else works fine. And then, the .exe only has this focus problem on my Dell Inspiron laptop running win 2k- strange- and not always (the first time works-sometimes- and then not afterwards- even when shut down and restarted!!) maybe I'll knock it up to just a OS/Platform problem....well I'll give you the duke anyway for the try-
Jim

Focus problem on a Powershot SD870 IS

Hi den253! Thank you for your post! So that the Community can better help, we'll need a little more information. What kind of focusing problem are you having with your PowerShot SD870 IS? Does this happen in all shooting modes, or just one? Are you seeing any error messages? Any other details you can give us will help us to help you better! If this is an urgent support need, please CLICK HERE to reach our friendly Technical Support Team by phone or email.
Thanks and have a great day!

Hi Johnfaris,
I am sorry to hear about the error message on your PowerShot SX500 IS.
This error indicates an internal error has occurred. Sometimes this can happen if the battery runs very low while the camera attempts to power off. Please try using an alternate or fully charged battery in the camera to make sure this was not the cause. If the battery is fully charged, try removing it for a few minutes. If the error still displays on your camera, then it will need to be serviced.
To start the repair process, you'll need to complete a Repair Request on our website.
If this is a time sensitive-matter, additional support options are available at Contact Us.
Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

Browser focus problem

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