[solved] Adding a ActionListener to JOptionPane.showOptionDialog?

Newbie & Debugging Questions
#1

Hey JGO, before we start let me show you what I’m talking about :stuck_out_tongue:

My question:
How can I prevent the user from clicking the “Send” button if the text field is empty?

I know this is done via JOptionPane.showOptionDialog which returns an int based on which button was clicked sooooo how can I do this?

My idea would be to make the JOptionPane.showOptionDialog show a custom JPanel that has buttons on it, and as soon as text is typed in the custom text field the button becomes visible to send, but this seems complex (easy, but complex) so I’m wondering if there’s a easier way to do this?

Here’s the code to show the popup:


		execServerCMDButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				// Popup header.
				String popupHeader = "Please enter a command:";

				// Popup buttons. (Custom)
				String[] options = { "Send", "Cancel" };

				// Panel that will contain our label/textfield.
				JPanel panel = new JPanel(new BorderLayout());

				// Label that will go on our panel.
				JLabel lbl = new JLabel(
						"<html><b>Enter a command to execute:</b>
<span style='font-size:10'>(To view command type /commands)</span></html>");

				// Textfield commands will be entered in.
				JTextField txt = new JTextField(20);

				// Add our label/txtfield to our panel.
				panel.add(lbl, BorderLayout.NORTH);
				panel.add(txt, BorderLayout.SOUTH);

				// Finally show the popup asking for a command
				int selectedOption = JOptionPane.showOptionDialog(
						frame.getContentPane(), panel, popupHeader,
						JOptionPane.YES_OPTION, JOptionPane.INFORMATION_MESSAGE, 
						null, options, txt);

				// Check whether they clicked send/cancel.
				if (selectedOption == 0) { // Send button

					// Obtain the text from the field:
					String command = txt.getText();

					// Make sure there's something in the field :P
					if (command == null || command.length() == 0) {
						// There is no text in the field
						// user just hit send... :/
						commandTextArea.append("Unable to process command. (FIELD WAS EMPTY)\n");
					} else {
						// There is some text in the command field
						// check if it's a valid command.
						if (isValidCommand(command)) {
							// TODO: Execute command :P
							commandTextArea.append("Command executed: "+ command + "\n");
						} else {
							// Not a valid command
							commandTextArea.append("Unable to process command. (INVALID COMMAND)\n");
						}
					}
				} else if (selectedOption == 1) { // Cancel button
					System.out.println("Command sending canceled");
				}
			}
		});

Thanks for any help JGO :slight_smile:

#2

do
{
int selectedOption = JOptionPane.showOptionDialog(
frame.getContentPane(), panel, popupHeader,
JOptionPane.YES_OPTION, JOptionPane.INFORMATION_MESSAGE,
null, options, txt);
}
while(txt.equals(""));

#3

Thank you for attempting to help, but it didn’t work :confused:

I’ll try making my own custom popup menu via jpanels/jbuttons etc unless somebody posts a reply that can solve this :slight_smile:

Once again thanks for the help thedanisaur.

EDIT: That just made it so when I click send/cancel it repeatedly makes the popup arise lol.

Had to change it to:


while(txt.getText().equals(""));
#4

In this stackoverflow post: http://stackoverflow.com/a/13055405

The responder creates a custom jdialog.

CopyableCougar4

#5

You always seem to have the answers my friend, thanks XD

I’ll invest some time looking @ the post and try to re-create it myself or I’ll end up being lazy and doing it my way lol.
Project isn’t for me it’s for a mate and I’m doing it for free. (Thus the lazyness lol)

#6

That while-loop is out of the question…
The custom dialog is a better option.

But I would say to just ‘do nothing’ when the user leaves it empty.
Error messages are really annoying sometimes, certainly when you accidentally activate something and it doesn’t leave after a blow on ENTER.

#7

Thanks for all the help guys, I’ve just reverted to creating my own custom popup :-*

(Still have to add commands :P)

Here’s the link for the code if anyone’s interested. (Shared code board)
Link to shared code