How to set Focus for Jcomponent such as JTextField, JRadioButton etc

Hi

How to set Focus for JComponet such as
JTextField, JRadioButton, etc.
That is, when displaying the Panel or JFrame, the Jcomponent should be the
default focus field. (no need to click
onto it to get focus).
 
heng03Asked:
Who is Participating?
 
jerchConnect With a Mentor Commented:
thank you :)
0
 
Laminamia063099Commented:
First, when you create the component, you need to set it's requestFocusEnabled:
  JComponent myComp = new JComponent();
  myComp.setRequestFocusEnabled(true);
 
//then you request the focus:
  myComp.requestFocus();

That should do it!

Laminamia
0
 
heng03Author Commented:
I have try it out, it doesn't work.
Pls note that I used JPanel to
Layout these JComponets.
Sometime, Panel within Panel.
Any probelm to set focus for such layout ?

Thanks
Phua
0
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jerchCommented:
hi heng03....
Invoke setFocus() after setVisible(). And add a line that disable request focus of the default component that has the focus by using setRequestFocusEnabled(false). By default, the requestFocus is enabled.

See code below...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test extends JFrame {
    JTextField field1, field2, field3, field4;

    public Test(String title) {
        super(title);
        setLocation(300,220);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        JPanel myPanel = new JPanel();
        field1 = new JTextField("field1");
        field2 = new JTextField("field2");
        field3 = new JTextField("field3");
        field4 = new JTextField("field4");

        myPanel.add(field1);
        myPanel.add(field2);
        myPanel.add(field3);
        myPanel.add(field4);
        getContentPane().add(myPanel);
        pack();
        setVisible(true);
        field1.setRequestFocusEnabled(false); //disable field1 from requesting focus
        field3.requestFocus();
    }

    public static void main(String[] args) {
        Test myframe = new Test("Test");
    }
}

Hope this helped...

Jerson
0
 
jerchCommented:
hi heng03....
Invoke setFocus() after setVisible(). And add a line that disable request focus of the default component that has the focus by using setRequestFocusEnabled(false). By default, the requestFocus is enabled.

See code below...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test extends JFrame {
    JTextField field1, field2, field3, field4;

    public Test(String title) {
        super(title);
        setLocation(300,220);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        JPanel myPanel = new JPanel();
        field1 = new JTextField("field1");
        field2 = new JTextField("field2");
        field3 = new JTextField("field3");
        field4 = new JTextField("field4");

        myPanel.add(field1);
        myPanel.add(field2);
        myPanel.add(field3);
        myPanel.add(field4);
        getContentPane().add(myPanel);
        pack();
        setVisible(true);
        field1.setRequestFocusEnabled(false); //disable field1 from requesting focus
        field3.requestFocus();
    }

    public static void main(String[] args) {
        Test myframe = new Test("Test");
    }
}

Hope this helped...

Jerson
0
 
jerchCommented:
Sorry I accidentally refreshed the browser... :)
0
 
heng03Author Commented:
Hi jerch, pls answer to this question
instead of comment.
I'll grant you the points.

Thanks
0
 
heng03Author Commented:
Thanks

heng03
0
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