vb.net barcode Extending JavaServer Faces in Java

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Extending JavaServer Faces
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usage example from 4 which displays data from a userBeansportsInterests object of type List:
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<h:dataTable value="#{userBeansportsInterests}" var="row" > <h:column> <h:outputText value="#{row}"/> </h:column> </h:dataTable>
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In Virtual Trainer, the main h:dataTable displays a List of training events (TrainingEvent objects) in a tabular format and is a little more complex:
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<h:dataTable id="eventsTable" rows="5" value="#{Main_BackingtrainingEventsForUser}" var="te" rowClasses="list-row-odd,list-row-even" headerClass="table-header" width="100%" binding="#{Main_Backingdata}"> <h:column rendered="#{UserBeantrainer}"> <f:facet name="header"> <h:panelGroup> <h:commandLink actionListener="#{Main_BackingsortByUserId}" immediate="true"> <h:outputText value="User Account"/> </h:commandLink> <h:graphicImage url="#{Main_BackingsortUserIdAsc '/images/arrow-upgif' : '/images/arrow-downgif'}" rendered="#{Main_BackingshowSortUserIdIcon}" height="13" width="9" /> </h:panelGroup> </f:facet> <h:outputText value="#{teuserid}"/> </h:column> <h:column> <f:facet name="header"> <h:panelGroup> <h:commandLink actionListener="#{Main_BackingsortByEvent}" immediate="true"> <h:outputText value="Event Name"/> </h:commandLink> <h:graphicImage url="#{Main_BackingsortEventAsc '/images/arrow-upgif' : '/images/arrow-downgif'}" rendered="#{Main_BackingshowSortEventIcon}" height="13" width="9" /> </h:panelGroup> </f:facet> <h:outputText value="#{teename}"/> </h:column> <h:column> <f:facet name="header"> <h:panelGroup> <h:commandLink actionListener="#{Main_BackingsortByDate}" immediate="true"> <h:outputText value="Event Date"/> </h:commandLink> <h:graphicImage url="#{Main_BackingsortDateAsc
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A p p l y i n g J S F : I n t r o d u c i n g t h e Vi r t u a l Tr a i n e r A p p l i c a t i o n
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'/images/arrow-upgif' : '/images/arrow-downgif'}" rendered="#{Main_BackingshowSortDateIcon}" height="13" width="9" /> </h:panelGroup> </f:facet> <h:outputText value="#{tecompletionDate}"> <f:convertDateTime pattern="MM-dd-yy"/> </h:outputText> </h:column> // // // // // // The remaining event data columns are omitted for brevity, but they have the same format with a column component containing a header facet with a commandLink to execute a sorting action listener, as well as a sorting image which renders based on whether or not the column is being sorted Below the header facet is the output text field displaying the data
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PART II
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// The final column simply renders the Select commandLink // to invoke the edit training event action method <h:column> <h:commandLink action="#{Main_BackingeditTrainingEventAction}"> <h:outputText value="Select" /> </h:commandLink> </h:column> </h:dataTable>
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In the Virtual Trainer h:dataTable example, notice the value attribute is set to #{Main_BackingtrainingEventsForUser}, which is an EL reference to the method getTrainingEventsForUser( ) of the session-scoped backing bean for mainjsp The getTrainingEventsForUser( ) backing bean method gets the current user s userid and first checks to see if the current user s status is of type trainer, meaning that this user is classified as an online sports fitness trainer and is authorized to offer training guidance to all registered regular users If the current user is a trainer, the backing bean method getAllEvents( ) of the TrainingEventRegistry (which manages the entire set of TrainingEvent objects for the application) is called The getAllEvents( ) method simply returns the entire List of TrainingEvent objects for every user back to the page so the current user (who is a trainer) can review and provide training guidance comments to them However, if the current user is not a trainer, the backing bean method sends the userid as an argument to another TrainingEventRegistry method, getEventlistForUser( ), which returns a filtered List of TrainingEvent objects corresponding to the user s userid The returned List is then sorted and returned to be displayed in the page using the h:dataTable The code for mainjsp s backing bean method, getTrainingEventsForUser( ) residing in Mainjava, is the following:
public List getTrainingEventsForUser() { // Get training events for this user, or all if user is a trainer List userEventList; UserBean managedUserBean= (UserBean)JSFUtilgetManagedObject("UserBean"); // Get user's userid String userid = managedUserBeangetUserid();
Part II:
Extending JavaServer Faces
TrainingEventRegistry eventRegistry = (TrainingEventRegistry) JSFUtilgetManagedObject("TrainingEventRegistry"); // If user is a trainer, return all Training Events, // else, only return events for the current user if (managedUserBeanisTrainer()) userEventList= eventRegistrygetAllEvents(); else { // is not a trainer so call getEventlistForUser userEventList= eventRegistrygetEventlistForUser(userid); } // Sort event list sortEvents(userEventList); return userEventList; }
The implementation code for the TrainingEventRegistry methods getAllEvents( ) and getEventListForUser( ) is dependent on the persistence layer technology; however, a Hibernate-based example is shown later in the chapter in the section Taking the Next Step Persisting Virtual Trainer Data Returning to the h:dataTable attributes, notice that the var attribute is set to te This is merely an iterator variable and is used to obtain row element data The rowClasses attribute defines the look and feel of the odd and even rows of the rendered table The two styles, list-row-odd and list-row-even, are provided in the vtcss CSS file The width attribute defines the actual width of the rendered HTML table from the h:dataTable The final binding attribute of the h:dataTable is worthy of special attention, however, because it is what enables data scrolling and row operations to be performed on the data retrieved for the h:dataTable component The binding attribute is set to a declared javax facescomponentUIData instance in the backing bean (Main_Backing)
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