JSF Adding Action Listeners

Question

I'm creating a MenuItem dynamically and I want to add a custom listener when the MenuItem is clicked.

I've tried adding addActionListener and setActionListener but neither of these get called when the link is clicked.

It appears that there is a List called "listeners" attached to MenuItem (I can see this when debugging a MenuItem setup with the listener statically). Any idea how to add the listener correctly?

Answer 1

They needs to be created and added as follows (copied from one of my previous answers):

FacesContext context = FacesContext.getCurrentInstance();
MethodExpression actionListener = context.getApplication().getExpressionFactory()
    .createMethodExpression(context.getELContext(), "#{bean.actionListener}", null, new Class[] {ActionEvent.class});
uiCommandComponent.addActionListener(new MethodExpressionActionListener(actionListener));

...where #{bean.actionListener} actually exists and is declared like follows in the backing bean class associated with the managed bean name bean:

public void actionListener(ActionEvent event) {
    // ...
}

More importantingly, you need to give any dynamically created UICommand (and UIInput) component in question a fixed ID as well, else it will get an autogenerated ID which may cause that JSF cannot locate/correlate it during the apply request values phase.

Thus, do so as well:

uiCommandComponent.setId("someFixedId");

Answer 2

The main issue as pointed out by BalusC is that you need to set the ID. Then you can add event listeners as follows: private MenuItem createItem(String name){ MenuItem item=new MenuItem(); item.addActionListener(new ActionListener() {

        public void processAction(ActionEvent event)
                throws AbortProcessingException {
            // handle event

        }
    });
    item.setValue(name);
    return item;
}