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javaswingeventslistenjformattedtextfield

putting "On Change" listener on jFormattedTextField

I have a jFormattedTextField in my program and I need to update a jLabel's text when jFormattedTextField value has been changed validly.
Actually jFormattedTextField gets a number and jLabel displays diffrence between this number and another number.
I currently do this by listenning to "FocusLost" event of jFormatted text.

How can i do this?

Solution

  • register a PropertyChangeListener for the property "value" to the formattedField

        PropertyChangeListener l = new PropertyChangeListener() {

        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            String text = evt.getNewValue() != null ? evt.getNewValue().toString() : "";
            label.setText(evt.getNewValue());
        }
    };
    formattedTextField.addPropertyChangeListener("value", l);

    Do not use DocumentListener nor FocusListener: the former is notified too often (on every keytyped, before parsing happened) the latter is too brittle.