How to veto textfield inputChanged()?

[l yeung]

Hi,

How do I veto textfield inputChanged()?
I need to prevent this from happening inside
AjaxFormComponentUpdatingBehavior("onchange").

protected void onUpdate(AjaxRequestTarget target) {
    String name = getModelObject().getName();
    if (query(name) == null) {
        // veto value change for this field.
    } else {
        // refresh form
    }
}

I would like to prevent any value change propagated to my domain object
while inside ajax onchange.

Thanks in advance.

Cheers