what is @,: in JSF

Question

I have few doubts on JSF

1. @this, @form and :form space with id of panel/row etc. What meant these attributes? When would be use these attributes in jsf?

2. In rendered attribute, can I check Application constants using primefaces extensions? For example:

   public class AppsUIConstants{

   public static final String UI_DAILY="Daily"; }

and used primefaces extensiosn import constants

<pe:importConstants className="com.core.util.AppsUIConstants" var="AppConstants" /> 

But how can I check above constants at rendered attribute?

Answer 1

For @:

@all - every component is executed
@form- The form which contains the component is processed
@none- No component is executed
@this- This is default. Requesting component is processed

You can find useful information at http://docs.jboss.org/richfaces/latest_4_0_X/Component_Reference/en-US/html/chap-Component_Reference-Common_Ajax_attributes.html

See How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"

@BalusC has given a great explanation here.