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Encoder Denso QR Bar Code in Java 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 V i r t u a l Tr a i n e r A p p l i c a t i o n

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 V i 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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<f:event type="preRenderView" listener="#{editTrainingEventBackingforwardToMainIfNotTrainer}" /> <f:event type="preRenderView" listener="#{editTrainingEventBackingloadTrainingEvent}" /> </ui:define>
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First, and most important, we have an <f:metadata> section that declares a <f:viewParam> named id This is the other side of the <h:link> on the allEventsxhtml page Second, we have forwardToMainIfNotTrainer, as mentioned earlier Finally, we have the editTrainingEventBackingloadTrainingEvent element This works in concert with <f:viewParam> to convey the selected event so that it can be edited in the page The code for loadTrainingEvent( ) on class EditTrainingEventBacking is shown here:
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// Getters and setters for these fields omitted for brevity private Long selectedEventId; private Event selectedEvent; private UIData trainingSessionData; public void loadTrainingEvent(ComponentSystemEvent cse) { // if the event has not yet been set if (null == getSelectedEvent()) { Long eventId = getSelectedEventId(); if (null == eventId) { // Try to get it from the flash eventId = (Long) getFlash()get("selectedEventId"); } if (null == eventId) { getFacesContext()addMessage(null, new FacesMessage("The training event you requested is invalid")); getFlash()setKeepMessages(true); getFacesContext()getApplication()getNavigationHandler() handleNavigation(getFacesContext(), null, "/user/allEvents faces-redirect=true"); } else { Event event = EventRegistrygetCurrentInstance() getEventForId(eventId); if (null == event) { getFacesContext()addMessage(null, new FacesMessage("The training event you requested does " + "not exist")); getFlash()setKeepMessages(true); getFacesContext()getApplication()getNavigationHandler() handleNavigation(getFacesContext(), null, "/user/allEvents faces-redirect=true"); } else { getFlash()put("selectedEvent", event); setSelectedEvent(event); } } } }
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This code loads the Event from the database given its id It stores the Event both using the selectedEvent setter, and also in the Flash This is necessary to enable postbacks to the editTrainingEventxhtml page If, for any reason, the event cannot be loaded, we add a helpful message and redirect back to the allEventsxhtml page Now that we have examined the metadata section of editTrainingEventxhtml, let s look at the content
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<ui:define name="content"> <h3>Event Information</h3> <h:form> <c:if test="#{! empty editTrainingEventBackingselectedEvent}"> <c:set target="#{flash}" property="selectedEvent" value="#{editTrainingEventBackingselectedEvent}" /> </c:if> <c:if test="#{! empty flashselectedEvent}"> <c:set target="#{editTrainingEventBacking}" property="selectedEvent" value="#{flashselectedEvent}" /> </c:if> <h:panelGrid columns="4" width="100%" border="0" class="form-bkg"> <h:outputText value="Event Title" /> <h:inputText value="#{editTrainingEventBackingselectedEventname}" required="true"></h:inputText> <h:outputText value="Event Type" /> <h:inputText value="#{editTrainingEventBackingselectedEventtype}" required="true" /> <h:outputText value="Event Date" /> <h:inputText value="#{editTrainingEventBackingselectedEventcompletionDate}" required="true"> <f:convertDateTime pattern="MM-dd-yy" /> </h:inputText> <h:outputText value="Skill" /> <h:selectOneMenu label="Skill" id="slevel" value="#{editTrainingEventBackingselectedEventskill}"> <f:selectItem itemLabel="Beginner" itemValue="beginner" /> <f:selectItem itemLabel="Intermediate" itemValue="intermediate" /> <f:selectItem itemLabel="Advanced" itemValue="advanced" /> </h:selectOneMenu> <h:commandButton action="#{editTrainingEventBackingupdateExistingTrainingEvent}" value="Update Event" /> <h:outputText value=" " /> <h:outputText value=" " /> <h:button outcome="/user/allEvents faces-redirect=true" value="Cancel" /> </h:panelGrid> </h:form> </ui:define>
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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 V i r t u a l Tr a i n e r A p p l i c a t i o n
The first two <c:if> statements cause the selected event to be pushed to the flash when the page renders, and pulled from the flash when the page posts back This is necessary to avoid putting the Event object in the session The <h:panelGrid> is just a simple form field, except that the fields point to the selectedEvent property of the EventTableBacking bean This is the Event that was looked up by id on the previous page; it is either looked up from the loadTrainingEvent( ) method when the page initially renders or looked up from the flash when the page posts back Once we have the selectedEvent properly being loaded, it s easy to update it with this button: <h:commandButton action="#{editTrainingEventBacking updateExistingTrainingEvent}" value="Update Event" /> The code for the method pointed to by this markup is shown here:
PART II
public String updateExistingTrainingEvent() { String result = null; EventRegistry eventRegistry = EventRegistrygetCurrentInstance(); Event newEvent = getSelectedEvent(); try { eventRegistryupdateEvent(newEvent); result = "/user/allEvents faces-redirect=true"; } catch (EntityAccessorException ex) { LoggergetLogger(EditTrainingEventBackingclassgetName()) log(LevelSEVERE, null, ex); } getFlash()clear(); return result; }
Once we update the modified event, we simply redirect back to the allEvents page The technique just shown, that of using view parameters in concert with the flash in /user/allEventsxhtml and /trainer/editTrainingEventxhtml, is applied in exactly the same way between the /user/editTrainingEventxhtml and /user/addTrainingSessionxhtml pages In the interest of brevity, this code is not present in the text, but it is available in the online sample The final two pages to examine are /trainer/viewTraineesxhtml and /trainer/viewTrainingSessionsForUserxhtml
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