JoptionPane, to not allow empty text

Question

how can i make the OK/X button impossible to click if user dont type number in the paginainicial and paginafinal textFields?

The Dialog

           final JTextField paginainicial = new JTextField();
           final JTextField paginafinal = new JTextField();
           Object[] message = {
                "Número da Primeira Folha: ", paginainicial,
                "Número Última Folha: ", paginafinal,
                "Pedido de: " + connection.getInetAddress().getHostName(),


            };
           Object[] options = {"OK"};

           int option = JOptionPane.showOptionDialog(null,
                          message,"Dados da Certidão",
                          JOptionPane.PLAIN_MESSAGE,
                          JOptionPane.QUESTION_MESSAGE,
                          null,
                          options,
                          options[0]);








      //  int option = JOptionPane.showConfirmDialog(null, message, "Dados da Certidão", JOptionPane.OK_CANCEL_OPTION);
        ocupado = "1";

        if (option == JOptionPane.OK_OPTION) {
            String primeirafolha = paginainicial.getText();
            String ultimafolha = paginafinal.getText();
            metodos metodosBD = new metodos();
            metodosBD.atualizafolha(primeirafolha, ultimafolha, caminhodoarquivo);
            System.out.println("Dados inseridos.");
            ocupado = "0";
            JOptionPane.showMessageDialog(null, "Certidão Finalizada");
        }else {
            metodos metodosBD = new metodos();
            metodosBD.removedadosBD(caminhodoarquivo);
            File certfile = new File(caminhodoarquivo);
            certfile.delete();
            System.out.println("Certidão Cancelada.");}

i tryed if text, but of course the if is after the OK press, so dont work :(

You could take a look at [this example](http://stackoverflow.com/questions/14334931/disable-ok-button-on-joptionpane-dialog-until-user-gives-an-input/14335083#14335083) and [this example](http://stackoverflow.com/questions/14591089/joptionpane-passing-custom-buttons/14591165#14591165) which is an extension to the first — MadProgrammer, Oct 09 '13 at 00:49

Hovercraft Full Of Eels · Answer 1 · 2013-10-08T21:28:27.013

I would create a custom-built modal JDialog for this. You could use DocumentListeners that are added to your text components to enable and disable the JButtons on the dialog.

Edit
You state:

hummm, in the way it is, can a create a KeyListenner to the textfields to check if the typed is number??? if its number, make the OK button visibile, but how can i access the button? its not a Jbutton

It is a JButton if you follow my suggestions above and make your own JDialog and don't use a JOptionPane. And no, you should almost never use a KeyListener with Swing applications. If you want to verify the input, use a JFormattedTextField or a DocumentFilter or an InputVerifier.

Edit 2
You state:

hummm, understand, i will read something about creating a modal Jdialog, thannk you :) this will work like "Jframe" isnt it? so i i will add components to it and will be possible to get Components events, property etc..

A JDialog is similar to a JFrame in that it's a top-level window, and like a JFrame you would load up a JPanel with all the components that it will display, then add the JPanel to the JDialog's contentPane, pack() it and set it visible, but it's different from a JFrame in that its constructors are different. You will need to pass in the parent window (here the main JFrame), a String title and a Dialog.ModalityType, likely APPLICATION_MODAL. Like a JOptionPane, once you set it to visible, all code from the calling code halts and waits for the dialog to no longer be visible prior to resuming.

hummm, in the way it is, can a create a KeyListenner to the textfields to check if the typed is number??? if its number, make the OK button visibile, but how can i access the button? its not a Jbutton :| — user2582318, Oct 08 '13 at 21:08
hummm, understand, i will read something about creating a modal Jdialog, thannk you :) this will work like "Jframe" isnt it? so i i will add components to it and will be possible to get Components events, property etc.. — user2582318, Oct 08 '13 at 21:16

score 2 · Answer 2 · answered Oct 08 '13 at 23:51

2

Read the section from the Swing tutorial on Preventing a Dialog From Closing for one approach.

answered Oct 08 '13 at 23:51

camickr

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JoptionPane, to not allow empty text

2 Answers2