JSpinner Value change Events

Question

How to make the update immediately when the jSpinner value was changed.

ChangeListener listener = new ChangeListener() {
  public void stateChanged(ChangeEve         


        

Answer 1

Problem here is that when you edit the JSpinner value manually by typing from the keyboard, the stateChanged event is not fired until the focus is lost by the JSpinner or until Enter key has been pressed.

If you want to upload the value, a KeyListener is needed which will perform a setValue in the JSpinner for each typed key.

I leave an example here for a JSpinner with a SpinnerNumberModel:

JSpinner spinner= new JSpinner();
spinner.setModel(new SpinnerNumberModel(0, 0, Integer.MAX_VALUE, 1));
spinner.addChangeListener(new ChangeListener() {
    @Override
    public void stateChanged(ChangeEvent e) {
        jLabel.setText(spinner.getValue());
    }
});
final JTextField jtf = ((JSpinner.DefaultEditor) spinner.getEditor()).getTextField();
jtf.addKeyListener(new KeyAdapter() {
    @Override
    public void keyReleased(KeyEvent e) {
        String text = jtf.getText().replace(",", "");
        int oldCaretPos = jtf.getCaretPosition();
        try {
            Integer newValue = Integer.valueOf(text);
            spinner.setValue(newValue);
            jtf.setCaretPosition(oldCaretPos);
        } catch(NumberFormatException ex) {
            //Not a number in text field -> do nothing
        }
    }
});