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TextListener question

Posted on 2004-08-05
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Last Modified: 2009-12-16
I am confused how to use the TextListener on a JTextField.

Since there is no JTextListener Interface, how can I trap every key stroke on a JTextField
by  using the TextListener?

Does any one have an example of how to do this (on a JTextField and not TextField ) or otherwise???
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Question by:prain
7 Comments
 

Accepted Solution

by:
ikerasd earned 100 total points
ID: 11726647
you can use the KeyListener class and the methods keyPressed(KeyEvent e) and keyTyped(KeyEvent e)
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LVL 30

Expert Comment

by:Mayank S
ID: 11726659
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LVL 37

Assisted Solution

by:zzynx
zzynx earned 100 total points
ID: 11726678
As an alternative you can add a document listener to the JTextField's document:

yourTextField.getDocument().addDocumentListener( someDocListener );
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Expert Comment

by:zzynx
ID: 11738234
>> how can I trap every key stroke on a JTextField
Just to know, why do you want that?
Is it to ignore/skip some characters typed in?
Then you should certainly use the document approach.
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LVL 3

Expert Comment

by:JohnnyAffa
ID: 11741511
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

class MyFrame extends JFrame implements KeyListener
{
    JTextField textField;
     Container contentPane;

   public MyFrame()
    {
          this.setBounds(10,10,400,400);
          contentPane = this.getContentPane();
         contentPane.setLayout(null);

          textField = new JTextField();

          textField.addKeyListener(this);
          textField.setBounds(10,10,200,30);

         contentPane.add(textField);
        this.setVisible(true);
   }

     public void keyPressed(KeyEvent event)
    {
System.out.println("PRESSED : " + event.getKeyChar());
     }

     public void keyReleased(KeyEvent event)
    {
System.out.println("RELEASED : " + event.getKeyChar());
    }

      public void keyTyped(KeyEvent event)
     {
System.out.println("TYPED : " + event.getKeyChar());
     }

     public void processWindowEvent(WindowEvent event)
   {
             if ( event.getID() == WindowEvent.WINDOW_CLOSING)
                  System.exit(0);
     }


         public static void main(String args[])
      {
                     MyFrame frame = new MyFrame();
          }
}
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