How to Set Focus on JTextField

Question

I make my game run without mouse so using pointer is not a choice  High Score menu will show when player lose   this is my code      highScore new MyTextField  Your Name        highScore addKeyListener this       highScore setFont font       highScore requestFocusInWindow      I have tried       highScore setFocusable true   highScore requestFocusInWindow    highScore requestFocus true   highScore requestFocus      but still not gained focus on my JTextField   How to focus it

User · Answer

If the page contains multiple item and like to set the tab sequence and focus I will suggest to use FocusTraversalPolicy.

grabFocus() will not work if you are using FocusTraversalPolicy.

Sample code

int focusNumber = 0;
Component[] focusList;
focusList = new Component[] { game, move, amount, saveButton,
            printButton, editButton, deleteButton, newButton,
            settingsButton };

frame.setFocusTraversalPolicy(new FocusTraversalPolicy() {

        @Override
        public Component getLastComponent(Container aContainer) {
            return focusList[focusList.length - 1];
        }

        @Override
        public Component getFirstComponent(Container aContainer) {
            return focusList[0];
        }

        @Override
        public Component getDefaultComponent(Container aContainer) {
            return focusList[1];
        }

        @Override
        public Component getComponentAfter(Container focusCycleRoot,
                Component aComponent) {
            focusNumber = (focusNumber + 1) % focusList.length;
            if (focusList[focusNumber].isEnabled() == false) {
                getComponentAfter(focusCycleRoot, focusList[focusNumber]);
            }
            return focusList[focusNumber];
        }

        @Override
        public Component getComponentBefore(Container focusCycleRoot,
                Component aComponent) {
            focusNumber = (focusList.length + focusNumber - 1)
                    % focusList.length;
            if (focusList[focusNumber].isEnabled() == false) {
                getComponentBefore(focusCycleRoot, focusList[focusNumber]);
            }
            return focusList[focusNumber];
        }
    });

User · Answer

This code mouse cursor    jtextfield       Jcombobox    location focused    try        Robot  robot   new Robot            int x   Jtextfield getLocationOnScreen   x          int y   Jtextfield getLocationOnScreen   y         JOptionPane showMessageDialog null  x  x lt  - y gt   y     for I location see         robot mouseMove x  y         catch  AWTException ex             ex printStackTrace

User · Answer

if is there only one Top-Level Container then last lines in GUI constructor would be for example        myFrame setVisible true   EventQueue invokeLater new Runnable          Override      public void run              myComponent grabFocus             myComponent requestFocus     or inWindow

User · Answer

If you want your JTextField to be focused when your GUI shows up  you can use this   in   new JTextField 40   f addWindowListener  new WindowAdapter         public void windowOpened  WindowEvent e            in requestFocus                 Where f would be your JFrame and in is your JTextField

User · Answer

How about put jTextField requestFocusInWindow    into jTextField FocusLost event  Works for me have 5 controls on JPanel  Soon as click on MessageBox  focus lost on jTextField  Used all the suggested codes but no luck Only above method works my case

User · Answer

public void actionPerformed ActionEvent arg0        if  arg0 getSource    clearButton                enterText setText null           enterText grabFocus       Places flashing cursor on text box

User · Answer

It was not working for me when tried to use   JOptionPane showConfirmDialog        But - I found a solution   Very primitive  but works   Just jump to the field by java awt Robot using key  Tab   For example   Robot robot   new Robot    robot keyPress KeyEvent VK TAB   robot delay 100   robot keyRelease KeyEvent VK TAB     If you should press multiple times on  Tab  to get your Component you can use below method   GUIUtils pressTab 3     Definition   public static void pressTab int amountOfClickes        SwingUtilities invokeLater new Runnable                 public void run                         try                               Robot robot   new Robot                    int i   amountOfClickes                  while  i--  gt  0                                        robot keyPress KeyEvent VK TAB                       robot delay 100                       robot keyRelease KeyEvent VK TAB                                               catch  AWTException e                                System out println  Failed to use Robot  got exception      e getMessage                                         If your Component location is dynamic  you can run over the while loop without limitation  but add some focus listener on the component  to stop the loop once arrived to it

User · Answer

Try this one    myFrame setVisible true   EventQueue invokeLater new Runnable          Override      public void run              myComponent grabFocus             myComponent requestFocus     or inWindow

User · Answer

In my case nothing above worked untill I called requestFocus   AFTER my constructor has returned   MyPanel panel   new MyPanel       frame add panel   panel initFocus      MyPanel initFocus   would have   myTextField requestFocus      And it works

User · Answer

While yourTextField requestFocus   is A solution  it is not the best since in the official Java documentation this is discourage as the method requestFocus   is platform dependent   The documentation says      Note that the use of this method is discouraged because its behavior is platform dependent  Instead we recommend the use of requestFocusInWindow      Use yourJTextField requestFocusInWindow   instead

[java] How to Set Focus on JTextField?

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