accessing dynamically generated Jbuttons

[Carl John]

hi..!
i'm generating jbuttons dynamically inside a jpanel. i want to write event for those buttons. Please guide me to do this..! Thanks in advance..

[Peter Taucher]

So, how do you create buttons dynamically? Is there by any chance a collection of buttons? No crystal ball here. There's no difference in defining one button or a bunch of buttons, so you'd better provide a more thourough description of your 'problem'.

We got a topic around here on danymic menu items ... maybe you want to look it up (it's not that different, because menu items and buttons are handled very similar):
https://coderanch.com/t/498424/GUI/java/applying-actionlistener-dynamic-submenu

[Carl John]

Peter Taucher wrote:So, how do you create buttons dynamically? Is there by any chance a collection of buttons? No crystal ball here. There's no difference in defining one button or a bunch of buttons, so you'd better provide a more thourough description of your 'problem'.

We got a topic around here on danymic menu items ... maybe you want to look it up (it's not that different, because menu items and buttons are handled very similar):
https://coderanch.com/t/498424/GUI/java/applying-actionlistener-dynamic-submenu

I had a JFrame which contains one jbutton and a jpanel. then i'm adding jbuttons like this..

here pan--> jpanel
//
//
int number = Integer.parseInt(JOptionPane.showInputDialog("Enter the number:"));
pan.removeAll();
for(int i=0;i<number;i++){
pan.setLayout(new GridLayout(4,2));
button = new JButton("Button"+i);
button.setName("Button"+i);
pan.add(button);
pan.revalidate();
}

later i want to access those buttons and get their names by click event..>

[Peter Taucher]

Ok, so I'm using exactly the same action as in the referenced thread (in exactly the same way):

public class FunWithButtons extends JFrame
{
    final List<JButton> buttons;
    
    public FunWithButtons( int numberOfButtons )
    {
        super( "Fun with buttons..." );
        setDefaultCloseOperation( DISPOSE_ON_CLOSE );
        
        Container pane = getContentPane();
        pane.setLayout( new GridLayout( 4, 2 ) );
        
        buttons = new ArrayList<JButton>( numberOfButtons );        
        
        for ( int i = 0; i < numberOfButtons; i++ )
        {
            JButton button = new JButton( new SomeAction( "Button " + i )  );
            pane.add( button );
            // Remember buttons in collection, we might need to access them sometime
            buttons.add( button );
        }
        
        pack();
    }
    
    public static void main( String[] args ) throws InterruptedException, InvocationTargetException
    {
        EventQueue.invokeAndWait( new Runnable()
        {   
            public void run()
            {
                int numberOfButtons = Integer.parseInt(
                    JOptionPane.showInputDialog( "Enter the number of buttons: " ) );
                new FunWithButtons( numberOfButtons ).setVisible( true );
            }
        });
    }
}

class SomeAction extends AbstractAction
{
    public SomeAction( String text )
    {
        super( text );
    }
    
    public void actionPerformed( ActionEvent e )
    {
        JOptionPane.showMessageDialog( null, "Action occured: " + getValue( NAME ) );
    }
}

[Rob Camick]

Here is a similiar example to get you started: http://forums.sun.com/thread.jspa?forumID=57&threadID=609795

[Carl John]

Peter Taucher wrote:Ok, so I'm using exactly the same action as in the referenced thread (in exactly the same way):

public class FunWithButtons extends JFrame
{
    final List<JButton> buttons;
    
    public FunWithButtons( int numberOfButtons )
    {
        super( "Fun with buttons..." );
        setDefaultCloseOperation( DISPOSE_ON_CLOSE );
        
        Container pane = getContentPane();
        pane.setLayout( new GridLayout( 4, 2 ) );
        
        buttons = new ArrayList<JButton>( numberOfButtons );        
        
        for ( int i = 0; i < numberOfButtons; i++ )
        {
            JButton button = new JButton( new SomeAction( "Button " + i )  );
            pane.add( button );
            // Remember buttons in collection, we might need to access them sometime
            buttons.add( button );
        }
        
        pack();
    }
    
    public static void main( String[] args ) throws InterruptedException, InvocationTargetException
    {
        EventQueue.invokeAndWait( new Runnable()
        {   
            public void run()
            {
                int numberOfButtons = Integer.parseInt(
                    JOptionPane.showInputDialog( "Enter the number of buttons: " ) );
                new FunWithButtons( numberOfButtons ).setVisible( true );
            }
        });
    }
}

class SomeAction extends AbstractAction
{
    public SomeAction( String text )
    {
        super( text );
    }
    
    public void actionPerformed( ActionEvent e )
    {
        JOptionPane.showMessageDialog( null, "Action occured: " + getValue( NAME ) );
    }
}

Thanks peter..!It works great..!A ton of Thanks to u..!

[Rob Camick]

Did you understand my suggestion which is slightly more efficient because you only need to create a single ActionListener, not a unique ActionListener for every button?

[Carl John]

Rob Camick wrote:Did you understand my suggestion which is slightly more efficient because you only need to create a single ActionListener, not a unique ActionListener for every button?

Hi Rob..!

Thanks for your suggestion.It Works fine...i got the solution for that....!

[Campbell Ritchie]

. . . and welcome to the Ranch, Carl John.