RichFaces Partial Tree Processing

by Online Tutorials Library July 14, 2022

Partial Tree Processing

RichFaces allows us to render partial tree by using RichFaces attributes. The execute attribute is used to specify that which part of the JSF tree to process during an Ajax request. The execute attribute can point to an id identifier of a specific component to process. Components can also be identified through the use of Expression Language (EL).

The execute attribute accepts the following keywords:

Keyword	Function
@all	It is used to processed every component.
@none	It is used to set that no components are processed.
@this	It is used to processed the requesting component with the execute attribute.
@form	It is used to processed the form that contains the requesting component.
@region	It is used to processed the region that contains the requesting component. You should use the <a4j:region> component as a wrapper element to specify regions.

Partial Tree Processing Example

// index.xhtml

  <!DOCTYPE html>  <ui:composition xmlns=”http://www.w3.org/1999/xhtml” xmlns:h=”http://java.sun.com/jsf/html”  xmlns:f=”http://java.sun.com/jsf/core” xmlns:ui=”http://java.sun.com/jsf/facelets” xmlns:a4j=”http://richfaces.org/a4j”  xmlns:rich=”http://richfaces.org/rich”>  <h:form id=”form”>  <h:outputText value=”User Name ” />  <h:inputText value=”#{user.name}” />  <a4j:commandButton value=”Enter Your Name” execute=”@form” />  </h:form>  <br/>  <a4j:outputPanel>  <h:outputText value=”Hello #{user.name} !” rendered=”#{not empty user.name}” />  </a4j:outputPanel>  </ui:composition>  

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