Supporting Value Change Listeners

Here is an application where spinner buttons fire change events that are counted and displayed: spinner2.

The listener is attached to the spinner tags with the valueChangeListener attribute just as they are attached to standard tags (see ch. 7): index.jsp.

• Note that the value of this attribute is a method expression

public class CreditCardExpiration {
    private int changes = 0;
    // to demonstrate the value change listener
    public void changeListener(ValueChangeEvent e) {
	changes++;
    }
}