Question

is it possible to pass a method in an EL expression?

I have one bean and two views. The second view has a button but which method the button triggers should be defined by the first view. So I have to tell the second view the method whe n I link from the first view.

I imagine something like this:

First View:

<h:link outcome="secondView.xhtml" value="Second view with method A">
    <f:param name="methodToCall" value="#{bean.methodA}">
</h:link>
<h:link outcome="secondView.xhtml" value="Second view with method B">
    <f:param name="methodToCall" value="#{bean.methodB}">
</h:link>

Second view:

<h:commandButton action="#{methodToCall}" value="Call the method" />

Answer 1

I don’t think there is a way to do this in JSF. My suggestion would be to have the call from the first view select a delegate in the backing bean which is called when clicking the action from the second view.

Something like this

public class Bean {

    public interface Delegate {
        void doSomething();
    }

    public class MethodADelegate implements Delegate {
        public void doSomething() {

        }
    }

    public class MethodBDelegate implements Delegate {
        public void doSomething() {

        }
    }

    private Delegate delegate;

    public String methodA() {
        this.delegate = new MethodADelegate();
        return "view2";
    }

    public String methodB() {
        this.delegate = new MethodBDelegate();
        return "view2";
    }

    public String view2Call() {
        delegate.doSomething();
        return "done";
    }
}

<h:commandLink action="#{bean.methodA}" value="Second view with method A" />
<h:commandLink action="#{bean.methodB}" value="Second view with method B" />

<h:commandButton action="#{bean.view2Call}" value="Call the method" />