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Swing / AWT / SWT

problem with showMessageDialog

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posted 19 years ago

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Hi everyone,
I seem to be having trouble displaying a message dialog.My application requires user input to a textField in a specific format(say hh-mm-ss).And whenever user enters invalid i/p,a dialog should appear saying "this is the wrong format.Please enter in the format hh-mm-ss" and in the dialog there is only one button ok.when pressed the user should be prompted to enter i/p again.

I am using JOptionsPane.showMessageDialog which is showing the dialog,but my application hangs when i click ok.Can someone please help me with the listener for the ok button.
Thanks,
Thejaswini.

John Wetherbie

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posted 19 years ago

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You may want to post your code so people may see what is going on.

The only reason for time is so that everything doesn't happen all at once.
- Buckaroo Banzai

Ken Blair

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posted 19 years ago

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No listener is needed. This is almost certainly unrelated to showMessageDialog() and is a problem with the code you've written that follows it.

Dieter Merlin

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posted 19 years ago

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indeed. The way I validate user input is in this way:

Messages.java

thejaswini ramesh

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posted 19 years ago

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Thanks John,Ken & Dieter...well my code is way too long to post completely.I will post only part of it...now i have written a custom dialog with ok button and a listener for tht.Please see if it makes any sense to you...I know am doing something wrong here but not able to figure it out...

public class Gui1 {/*my main class*/
.
.
.
  private static void initGui() {
.
.
    dialog = new JDialog(mainFrame, "Input Error", true);  /*the custum dialog*/
    
    JLabel label = new JLabel("<html><p align = center>"
+ " The Input entered is incorrect! The format is:\n"
 + " cmd:tid:[aid]:ctag[:gb]:<other>;<cr lf> \n"
+ " Please enter again");
 
    okButton = new JButton("OK");
       
 
    JPanel closePanel = new JPanel();
    closePanel.setLayout(new BoxLayout(closePanel,BoxLayout.LINE_AXIS));
    closePanel.add(Box.createHorizontalGlue());
    closePanel.add(okButton);
    closePanel.setBorder(BorderFactory.createEmptyBorder(0,0,5,5));
 
    JPanel contentPane = new JPanel(new BorderLayout());
    contentPane.add(label, BorderLayout.CENTER);
    contentPane.add(closePanel,BorderLayout.PAGE_END);
    contentPane.setOpaque(true);
    dialog.setContentPane(contentPane);
.
.
.
   tlCommand = new JTextField(25);/*here i take in the input*/
.
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   sendButton = new JButton(" SEND "); /*the button associated with the textfield tlCommand*/
   sendButton.addActionListener(new ActionListener() {  /*listener for send button*/
       public void actionPerformed(ActionEvent et) {
 String str = tlCommand.getText();

StringTokenizer st = new StringTokenizer(str,":");
  int num = st.countTokens();
  if((num == 4) || (num == 6)) {
              out.println(str);
      tlCommand.setText(" ");
              tlWindow.append(str + "\n");
      
  }  
  else {
    
      dialog.setSize(new Dimension(300,150));
      dialog.setLocationRelativeTo(mainFrame);
      dialog.setVisible(true);
 
  } 
           }
    });

okButton.addActionListener(new ActionListener() {   /*listener for the ok button of the dialog...this gets executed but still the 
application hangs.*/
      public void actionPerformed(ActionEvent ae) {
//tlCommand.setSelected(true);
        //dialog.hide();
        SwingUtilities.invokeLater(new Runnable() {
          public void run() {
            System.out.println("ok button action listener");
            dialog.setVisible(false);
    System.out.println("print this...");
    tlCommand.setEditable(true);
    System.out.println("exit listener...");
  }
        });
      }
    });
 
.
  .
.
.
   public static void main(String[] args) {
    initGui();
  }
}

Thanks for your time.
Thejaswini.

Michael Dunn

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Posts: 4632

posted 19 years ago

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this might be one way.

needs testing to ensure the hour range is what you want

import javax.swing.*;
import javax.swing.text.*;
class  Testing
{
  public Testing()
  {
    MaskFormatter  mf = null;
    try{mf = new  MaskFormatter("##-##-##");}
    catch(Exception e){e.printStackTrace();}
    JFormattedTextField ftf = new JFormattedTextField(mf);
    ftf.setInputVerifier(new DateVerifier());
    JOptionPane.showMessageDialog(null,ftf,"Time format hh-mm-ss",-1);
    JOptionPane.showMessageDialog(null,"You will only see this when a valid time is entered");
    System.exit(0);
  }
  public static void main(String[] args){new Testing();}
}
 
class DateVerifier extends InputVerifier
{
  java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("hh-mm-ss");
  java.util.Calendar cal = java.util.Calendar.getInstance();
  public DateVerifier(){sdf.setLenient(false);}
  public boolean verify(JComponent input)
  {
    JFormattedTextField ftf = (JFormattedTextField) input;
    try
    {
      cal.setTime(sdf.parse(ftf.getText()));
    }
    catch (Exception pe )
    {
      JOptionPane.showMessageDialog(null,"invalid data, format hh-mm-ss\n\nTry again");
      return false;
    }
    return true;
  }
}

thejaswini ramesh

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Posts: 74

posted 19 years ago

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Thanks everybody...John, Ken ,Dieter & Michael...now my code is working.

The basic problem seems to be the code following showMessageDialog like you suggested ken.Once again thanks to all of you.

Thejaswini.

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