Problem Using KeyListener in swing program.

[gauravfzd]

Hi guys I am creating a Swing application, but having a problem in using keyListener.
I am building a JFrame containing a JDesktopPane. This JDesktopPane will show three JInternalFrame. This programe uses a Sqlite embedded database. The InternalFrames is used For
1. Displaying Data
2. Inserting Data
3. Updating Data

In the Update Internal frame I have a JTextField "sno" on which I applied the KeyListener.
What I require is that when I type the Integers in this Jtextfield, the matching Serial No should
match in the database and rest of the text boxes should automatically fill up.
The Code I have written is this:

@Override
public void keyTyped(KeyEvent e){		
       	if(winUp != null){
		if(e.getSource().equals(winUp.tsno)==true){
			char ch = e.getKeyChar();
			String sno = winUp.tsno.getText();  /****This is where the problem lies****/
			if((ch>32 && ch < 48) || (ch > 57 && ch < 126)){					
				JOptionPane.showMessageDialog(winUp,MSG,"Wrong input",JOptionPane.WARNING_MESSAGE);
				e.consume();
			}
			else{
				if(sno != null){
					if(ActionHandle.validSerial(sno)==true){
						Game g = DBIntf.find(sno);
						if(g != null){
							setData(g);
							winUp.snoUp = sno;
						}
						else{
							ActionHandle.clearUpdate(winUp);
						}
					}						
				}			
			}
		}
	}
}

The problem in this code is where I marked in Comment. That is the getText() method of the JTextField is not providing the text in the TextField.
When I Type one more character then the text before this typed character is returned by the TextField.

I am puzzled. Please help....

[Fubarable]

Don't use a KeyListener in this situation. Much more appropriate would be a DocumentListener if you're not going to modify the text entered into the JTextField or a DocumentFilter if you are going to modify the text (or allow vs disallow some text).

[gauravfzd]

OK, But how to use DocumentListener? I don't See any method like addDocumentListener() on the reference of JTextField...

[camickr]

Add it to the Document of the text component.

[gauravfzd]

Is it the setDocument(Document doc) method?

[Junky]

Is it the setDocument(Document doc) method?

To do what?

[Fubarable]

You call getDocument() on the JTextField to get its document and then you add the DocumentListener to that Document.

[gauravfzd]

Thanks I will try it.....