Updating JSpinner display

Question

Hi, I have created a JSpinner that's responsive to the user input by adding a keyListener. The code would check to make sure the user input is valid, or else it would set the user input to the last valid display value. i would like the JSpinner's TextField to change on the fly; however, it seems that the display (JSpinner's Textfield) is never updated properly until Enter key is pressed. I would be greatly appreciated if someone can help out thanks.
public void JSpinnerSampleCode(){
     KeyAdapter listener1 = new KeyAdapter() {
      * Invoked when a key has been typed.
      * This event occurs when a key press is followed by a key release.
     @Override
     public void keyTyped(KeyEvent e) {
               Object source = e.getSource();
          if (source == ((JSpinner.DefaultEditor)daySpinner.getEditor()).getTextField()){
               dayFieldChanged();
     SpinnerNumberModel daySpinnerModel = new  SpinnerNumberModel(new Integer(0),new Integer(0),new Integer(364),new Integer(1));
     JSpinner daySpinner = new JSpinner(daySpinnerModel);
private void dayFieldChange(){
          int tempDays;
       /* please note the variable daysis a global value, declared as int*/
          JFormattedTextField dayTextField =((JSpinner.DefaultEditor)daySpinner.getEditor()).getTextField();
          dayTextField.setEditable(true);
          try{
               if (dayTextField.getText().length() == 0) days = 0;
               tempDays = Integer.parseInt(dayTextField.getText());
               if (tempDays > 365 || tempDays < 0) {
                    throw new NumberFormatException();
               }else{
                    days = tempDays;
          }catch(NumberFormatException e){
               getToolkit().beep();
               String dayDisplay = (new Integer(days)).toString();
               dayTextField.setText(dayDisplay);
               try {
                    dayTextField.commitEdit();
               } catch (ParseException e1) {
                    e1.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
               dayTextField.setCaretPosition(dayTextField.getText().length());
                        dayTextField.repaint();
               dayTextField.revalidate();
}The repaint() and revalidate() doesn't seem to update to the correct value. For example if I type in 658. The computer would beep to indicate that there is error. The display will not change the dayTextField value ( it will display 658)unless I pressed Enter Key, then it would change to 65. I am wondering is there a way to making it change on the fly, thanks

Answer 1

ok, this is a simplified version of source code. I place the number of character restriction to 2, but when you run the JSpinner, you can see that type in (more than 2 characters). The subroutine never for once enters or calls the CustomizeDocFilter.java's insertString or replace function which supposes to restrict the user input.
import javax.swing.*;
import javax.swing.event.DocumentListener;
import javax.swing.event.DocumentEvent;
import javax.swing.text.*;
import java.awt.*;
public class JspinnerTest extends JDialog {
     private JPanel contentPane;
     private JSpinner spinner1;
     private JButton buttonOK;
     public JspinnerTest() {
          setContentPane(contentPane);
          setModal(true);
          getRootPane().setDefaultButton(buttonOK);
     public static void main(String[] args) {
          JspinnerTest dialog = new JspinnerTest();
          dialog.pack();
          dialog.setSize(100, 100);
          dialog.setVisible(true);
          System.exit(0);
     private void createUIComponents() {
          SpinnerNumberModel numberMd = new SpinnerNumberModel(0, 0, 1000, 1);
          spinner1 = new JSpinner(numberMd);
          JTextField spinnerTextField = ((JSpinner.DefaultEditor) spinner1.getEditor()).getTextField();
          AbstractDocument doc = (AbstractDocument) spinnerTextField.getDocument();
          doc.setDocumentFilter(new CustomizeDocFilter(2));
          DocumentListener lister1 = new DocumentListener() {
                * Gives notification that there was an insert into the document.  The
                * range given by the DocumentEvent bounds the freshly inserted region.
                * @param e the document event
               public void insertUpdate(DocumentEvent e) {
                * Gives notification that a portion of the document has been
                * removed.  The range is given in terms of what the view last
                * saw (that is, before updating sticky positions).
                * @param e the document event
               public void removeUpdate(DocumentEvent e) {
                    //To change body of implemented methods use File | Settings | File Templates.
                * Gives notification that an attribute or set of attributes changed.
                * @param e the document event
               public void changedUpdate(DocumentEvent e) {
                    //To change body of implemented methods use File | Settings | File Templates.
          doc.addDocumentListener(lister1);
// GUI initializer generated by IntelliJ IDEA GUI Designer
// >>> IMPORTANT!! <<<
// DO NOT EDIT OR ADD ANY CODE HERE!
          $$$setupUI$$$();
      * Method generated by IntelliJ IDEA GUI Designer
      * >>> IMPORTANT!! <<<
      * DO NOT edit this method OR call it in your code!
      * @noinspection ALL
     private void $$$setupUI$$$() {
          createUIComponents();
          contentPane = new JPanel();
          contentPane.setLayout(new GridBagLayout());
          final JPanel panel1 = new JPanel();
          panel1.setLayout(new GridBagLayout());
          GridBagConstraints gbc;
          gbc = new GridBagConstraints();
          gbc.gridx = 0;
          gbc.gridy = 0;
          gbc.weightx = 1.0;
          gbc.weighty = 1.0;
          gbc.fill = GridBagConstraints.BOTH;
          contentPane.add(panel1, gbc);
          gbc = new GridBagConstraints();
          gbc.gridx = 0;
          gbc.gridy = 0;
          gbc.anchor = GridBagConstraints.WEST;
          gbc.fill = GridBagConstraints.HORIZONTAL;
          panel1.add(spinner1, gbc);
      * @noinspection ALL
     public JComponent $$$getRootComponent$$$() { return contentPane; }
}For the CustomizeDocFilter class, I paste it below, but as mentioned in the previous posting. I got this off Sun's website.
import javax.swing.text.DocumentFilter;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import java.awt.*;
* Created by IntelliJ IDEA.
* User: wcw
* Date: 22-Feb-2007
* Time: 3:39:57 PM
* To change this template use File | Settings | File Templates.
public class CustomizeDocFilter extends DocumentFilter {
         int maxCharacters;
         boolean DEBUG = true;
         public CustomizeDocFilter(int maxChars) {
             maxCharacters = maxChars;
         public void insertString(FilterBypass fb, int offs,
                                  String str, AttributeSet a)
             throws BadLocationException {
             if (DEBUG) {
                 System.out.println("in DocumentSizeFilter's insertString method");
             //This rejects the entire insertion if it would make
             //the contents too long. Another option would be
             //to truncate the inserted string so the contents
             //would be exactly maxCharacters in length.
             if ((fb.getDocument().getLength() + str.length()) <= maxCharacters)
                 super.insertString(fb, offs, str, a);
             else
                 Toolkit.getDefaultToolkit().beep();
                  System.out.println("error!!!");
         public void replace(FilterBypass fb, int offs,
                             int length,
                             String str, AttributeSet a)
             throws BadLocationException {
             if (DEBUG) {
                 System.out.println("in DocumentSizeFilter's replace method");
             //This rejects the entire replacement if it would make
             //the contents too long. Another option would be
             //to truncate the replacement string so the contents
             //would be exactly maxCharacters in length.
             if ((fb.getDocument().getLength() + str.length()
                  - length) <= maxCharacters)
                 super.replace(fb, offs, length, str, a);
             else
                 Toolkit.getDefaultToolkit().beep();
                  System.out.println("error!!!");
}I hope it helps