I am trying to make an AJAX request in the onClick event of an h:commandButton using JSF. The call is doing everything correctly and is coded as:

onclick="ajaxValidateUser()"

However, I also have an event in my backing bean bound to an actio attribute as:

action="{myBB.registerUser()}"

But if the ajax validation fails, I don't want the action event fired. How can I only fire the action event if the ajax validation succeeds?