How do you disable the Submit button after the user clicks it but re-enable it if validation errors occurred? Thanks.
Answering my own question :D
<a4j:commandbutton action="#{newemployee.sendEmail()}" value="Submit"> onclick="this.disabled=true" oncomplete="#{facesContext.maximumSeverity == null ? '' : 'this.disabled=false'}"/></a4j:commandbutton>