marți, 10 februarie 2015

Dynamically load content from WEB-INF in PrimeFaces center layout unit using Facelets and AJAX

In this post, you can see how to dynamically load content from WEB-INF folder in a PrimeFaces layout unit (e.g. center layout unit) using Facelets tags and AJAX. The main page, index.xhtml contains the PrimeFaces Layout component. In the west layout unit we have two buttons for loading pageA or pageB content in the center layout unit (pageA and pageB are stored in WEB-INF folder). Moreover, we have an AJAX loading indicator:

...
<p:layout fullPage="true">
 <p:layoutUnit position="west" size="200">
  Select Page
  <hr/>
  <h:form>
   <p:commandButton value="Page A" update=":mainPanelId"
    action="#{pageBean.changePageAction('/WEB-INF/pages/pageA.xhtml')}"/>
  </h:form>
  <h:form>
   <p:commandButton value="Page B" update=":mainPanelId"
     action="#{pageBean.changePageAction('/WEB-INF/pages/pageB.xhtml')}"/>
  </h:form>                               
  <hr/>      
  <p:ajaxStatus style="display:block;margin-bottom:2em;height:24px;">                   
   <f:facet name="start">
    <h:graphicImage library="default" name="images/ajax_loader.gif" />
   </f:facet>                  
  </p:ajaxStatus>
 </p:layoutUnit>

 <p:layoutUnit position="center">               
  <h:panelGroup id="mainPanelId" layout="block">
   <ui:include src="#{pageBean.page}" />
  </h:panelGroup>              
 </p:layoutUnit>
</p:layout>
...

The pageA is pretty simple (pageB is almost identical):

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
      xmlns:h="http://xmlns.jcp.org/jsf/html">

 <ui:composition>           
  <h:outputText value="This is page A content ..." style="color: #cc0000;"/>
 </ui:composition>
</html>

And the managed bean:

@ManagedBean
@ViewScoped
public class PageBean {

 private String page = "/WEB-INF/pages/pageA.xhtml";

 public String getPage() {
  return page;
 }

 public void setPage(String page) {
  this.page = page;
 }

 public void changePageAction(String page) {              
  this.page = page;
 }
}

Output:

Complete code on GitHub [PFChangeLayoutContent]
la

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