Question

The conditional operator works in many attributes like “rendered” “value” and others.

But it does not work in action? Or am I doing it wrong?

<h:commandLink action="#{true ? bean.methodTrue() : bean.methodFalse()}"/>

Error: javax.el.ELException: Not a Valid Method Expression

(I realized it using primefaces ajax action attribute)

Answer 1

This is not supported. The action attribute is supposed to be a MethodExpression, but the conditional operator makes it a ValueExpression syntax. I don’t think this will ever be supported for MethodExpressions in EL.

You have basically 2 options:

1. Create a single action method which delegates the job.

   <h:commandButton ... action="#{bean.method}" />
   

   with

   public String method() {
       return condition ? methodTrue() : methodFalse();
   }
   

   If necessary, pass it in as method argument by #{bean.method(condition)}.

2. Or, conditionally render 2 buttons.

   <h:commandButton ... action="#{bean.methodTrue}" rendered="#{bean.condition}" />
   <h:commandButton ... action="#{bean.methodFalse}" rendered="#{not bean.conditon}" />