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Example Usage
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The following example shows how to develop a request-scoped JSF managed bean that has a getter and setter that provides a layer of abstraction over PortletSessionAPPLICATION_ SCOPE:
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public class ModelManagedBean { public static final String SHARED_STRING_KEY = "sharedStringKey"; public String getSharedString() { return PortletSessionUtilgetSharedSessionAttribute( SHARED_STRING_KEY); } public void setSharedString(String value) { PortletSessionUtilsetSharedSessionAttribute(
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Appendix:
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JSF Portlets
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SHARED_STRING_KEY, value); } } public class PortletSessionUtil { public static Object getSharedSessionAttribute( String key) { FacesContext facesContext = FacesContextgetCurrentInstance(); ExternalContext externalContext = facesContextgetExternalContext(); PortletSession portletSession = (PortletSession) externalContext()getSession(false); return portletSessiongetAttribute( key, PortletSessionAPPLICATION_SCOPE); }
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PART III
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public static void setSharedSessionAttribute( String key, Object value) { FacesContext facesContext = FacesContextgetCurrentInstance(); ExternalContext externalContext = facesContextgetExternalContext(); PortletSession portletSession = (PortletSession)externalContext()getSession(false); portletSessionsetAttribute( key, value, PortletSessionAPPLICATION_SCOPE); } }
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Alternatively, if using the Spring Framework to replace or augment the JSF Managed Bean Facility, then developers can store data in PortletSessionAPPLICATION_SCOPE using the globalSession scope keyword
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Example Usage
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The following example shows how to specify a Spring bean that is to be stored in PortletSessionAPPLICATION_SCOPE by registering it in the WEB-INF/applicationContext xml configuration file:
<bean id="sharedManagedBean" class="comsamplejsfSharedManagedBean" scope="globalSession"/>
Part III:
JavaSer ver Faces Tools and Libraries
ICEfaces Portlet Development
ICEfaces is an open source extension to JSF that enables developers with Java EE application skills to build Ajax-powered Rich Internet Applications (RIA) without writing any JavaScript code The product contains a robust suite of Ajax-enabled JSF UI components, and also supports a broad array of Java application servers, IDEs, third-party components, and JavaScript effect libraries The project home page can be found at wwwicefacesorg Because of its integrated Ajax framework, ICEfaces is a particularly good choice for developing RIA portlets Consider a portal page that contains two portlets: Portlet A and Portlet B When submitting a form in Portlet A, an HTTP POST takes place and the entire portal page is refreshed This can result in a disruptive end-user experience if the user had entered data in Portlet B prior to submitting Portlet A ICEfaces allows you to combat this disruptive experience with RIA features in your portlets ICEfaces can be used in a variety of portal products, including Liferay Portal Since July 2007, Liferay, Inc, and ICEsoft Technologies, Inc, have had a technology partnership in place to support customers that want to develop and deploy ICEfaces portlets within Liferay Portal
ICEfaces Ajax with Partial Submit
When a portal page is requested for the first time via HTTP GET, portlets built with ICEfaces undergo the RENDER_PHASE of the portlet lifecycle just like any other portlet From that point on, ICEfaces circumvents normal interaction through the portlet container When doing a form submission from an ICEfaces portlet, an HTTP POST will not be performed; instead, form submission takes place via Ajax There are two techniques that developers can use in order to enable Ajax in a JSF view built with ICEfaces component tags: 1 Specify paritalSubmit= true on the ice:form tag 2 Specify partialSubmit= true on each ICEfaces component tag Note that if the first technique is used, then ICEfaces component tags that are used to perform full form submissions (such as ice:commandButton) must specify partialSubmit= false
Example Usage
The following example shows how to enable Ajax in a Facelet view built with ICEfaces component tags:
< xml version="10" encoding="UTF-8" > <f:view xmlns="http://wwww3org/1999/xhtml" xmlns:f="http://javasuncom/jsf/core" xmlns:ice="http://wwwicesoftcom/icefaces/component" xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xsi:schemaLocation="http://wwww3org/1999/xhtml http://wwww3org/2002/08/xhtml/xhtml1-transitionalxsd"> <ice:portlet> <ice:form partialSubmit="true"> <ice:panelGrid columns="2"> <ice:outputLabel
Appendix:
JSF Portlets
for="firstName" value="First Name" /> <ice:inputText value="#{modelManagedBeanfirstName}" /> <ice:message for="firstName" /> <ice:outputLabel for="lastName" value="Last Name" /> <ice:inputText value="#{modelManagedBeanlastName}" /> <ice:message for="lastName" /> <ice:commandButton action="#{backingManagedBeansubmit}" partialSubmit="false" /> </ice:panelGrid> </ice:form> </ice:portlet> </f:view>
ICEfaces Direct-to-DOM RenderKit
Rather than writing markup directly to the response, ICEfaces components render themselves into a server-side Document Object Model (DOM) via the ICEfaces Direct-toDOM (D2D) RenderKit When a JSF view is requested for the first time, the markup inside the server-side DOM is delivered to the browser as part of the response As the user interacts with the UI of the portlet, ICEfaces transparently submits user actions via Ajax and executes the JSF lifecycle When the RENDER_RESPONSE phase of the JSF lifecycle completes, ICEfaces will compare the previous server-side DOM with the latest server-side DOM and send the incremental page updates back to the browser via the ICEfaces Ajax Bridge In order to improve the application experience of the end user, ICEfaces will only permit fields that have been visited by the user to undergo validation during the PROCESS_VALIDATIONS phase of the JSF lifecycle This approach is sometimes referred to as dom-diffing and provides the following benefits for portlets: The end user is immediately presented with form validation failures for visited fields when pressing the TAB key When a navigation rule fires and a new JSF view is to be rendered, ICEfaces will render the new JSF view by performing a complete update of the markup contained in the affected portlet, rather than causing the entire browser page to reload ICEfaces portlets will not disturb other portlets on the same portal page
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