I want to be able to pass a value of javascript function to an ui:parameter like this:

<ui:param name="paramName" value="someWidget.function()"/>

But this obviously does not work (it thinks that: someWidget.function() is a string parameter).

If I try:

<ui:param name="paramName" value="#{someWidget.function()}"/>

It thinks that someWidget is a bean name.

Is there any way to place there a value of javascript function on a widget? If not, what would be ideal way of including a value of javascript function in a parameter in JSF?