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Read this chapter for details on special functions for use with particular components. Using JavaServer Faces Expression Language (JSF EL), these functions can be accessed through the data attribute of components. Refer to Section 2.4.4.1, “data” for details on the data attribute.
The rich:clientId('id') function returns the client identifier related to the passed component identifier ('id'). If the specified component identifier is not found, null is returned instead.
The rich:component('id') function is equivalent to the RichFaces.$('clientId') code. It returns the client object instance based on the passed server-side component identifier ('id'). If the specified component identifier is not found, null is returned instead. The function can be used to get an object from a component to call a JavaScript API function without using the <rich:componentControl> component.
The rich:element('id') function is a shortcut for the equivalent document.getElementById(#{rich:clientId('id')}) code. It returns the element from the client, based on the passed server-side component identifier. If the specified component identifier is not found, null is returned instead.
The rich:findComponent('id') function returns the a UIComponent instance of the passed component identifier. If the specified component identifier is not found, null is returned instead.
Example 16.1. rich:findComponent example
<h:inputText id="myInput">
<a4j:support event="keyup" render="outtext"/>
</h:inputText>
<h:outputText id="outtext" value="#{rich:findComponent('myInput').value}" />
The rich:isUserInRole(Object) function checks whether the logged-in user belongs to a certain user role, such as being an administrator. User roles are defined in the web.xml settings file.
Example 16.2. rich:isUserInRole example
The rich:isUserInRole(Object) function can be used in conjunction with the rendered attribute of a component to only display certain controls to authorized users.
<rich:editor value="#{bean.text}" rendered="#{rich:isUserInRole('admin')}"/>