1. Do
something if this is a postback request:
<h:outputText
rendered="#{facesContext.postback}"
value="OK!"/>
2. Do
something if this is a postback request and validation didn't failed:
<h:outputText
rendered="#{facesContext.postback
and not facesContext.validationFailed}" value="OK!" />
3. Do
something only if this is an AJAX request:
<h:outputText
rendered="#{facesContext.partialViewContext.ajaxRequest}"
value="OK!"/>
4. Do
something only if there are no messages to display (any kind of JSF messages):
<h:outputText
rendered="#{facesContext.messageList.size()
eq 0}" value="OK!">
5. Do
something only if the current user is in the specified role:
<h:outputText
rendered="#{facesContext.externalContext.isUserInRole('some_role')}"
value="OK!"/>
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