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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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rowClasses="list-row"> <h:outputLabel value="Event Title" styleClass="GUITag" for="ename"/> <h:inputText id="ename" value="#{EditTrainingEventename}"/> <h:outputLabel value="Event Type" styleClass="GUITag" for="etype"/> <h:inputText id="etype" value="#{EditTrainingEventetype}"/> <h:outputLabel value="Event Date" styleClass="GUITag" for="date"/> <h:inputText id="date" value="#{EditTrainingEventcompletionDate}"> <f:convertDateTime pattern="MM-dd-yy"/> </h:inputText> <h:outputLabel value="Skill" styleClass="GUITag" for="skill"/> <h:inputText id="skill" value="#{EditTrainingEventskill}"/> <h:outputLabel value="Current Status" styleClass="GUITag" for="status"/> <h:selectOneMenu id="status" value="#{EditTrainingEventstatus}"> <f:selectItem itemLabel="Not Started" itemValue="Not Started"/> <f:selectItem itemLabel="In Progress" itemValue="In Progress"/> <f:selectItem itemLabel="Completed" itemValue="Completed"/> <f:selectItem itemLabel="Ongoing" itemValue="Ongoing"/> </h:selectOneMenu> <h:outputLabel value="Online Trainer Adviser" styleClass="GUITag" for="trainer"/> <h:inputText id="trainer" value="#{EditTrainingEventtrainer}"/> </h:panelGrid> <h:panelGrid columns="3" width="25%" cellpadding="12"> <h:commandButton value="Update Event" action="#{EditTe_BackingsaveTEAction}"/> <h:commandButton value="Delete Event" action="delete"/> <h:commandButton value="Return" action="main"/> </h:panelGrid>
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The edit portion is straightforward and simply provides information about the selected training event employing outputText components with the exception of the event status where a selectMenu can be used to update the overall status of the event Notice that all the fields are value-bound to the EditTrainingEvent (row) object that was saved in the
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FIGURE 9-16 The training event edit form
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editTrainingEventAction( ) action method Before discussing the saveTEAction( ) method code, we ll continue on with the detail portion of the page In the lower portion of the edit page, shown in Figure 9-17, is the tabular (detail) portion that displays the workout sessions of the training event and also serves as the detail portion of the page The following is the source code for the workout sessions portion of the page
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<h:outputText value="Training Sessions" styleClass="PageTitle"/> <h:dataTable id="sessionsTable" value="#{EditTrainingEventworkoutsessions}" var="se" rows="5" binding="#{EditTe_Backingdata}" rowClasses="list-row-odd,list-row-even" headerClass="table-header"width="100%" > <h:column> <f:facet name="header"> <h:outputText value="Workout #"/> </f:facet> <h:outputText value="#{seid}"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Workout Date"/> </f:facet> <h:outputText value="#{seworkoutDate}"> <f:convertDateTime pattern="MM-dd-yy"/> </h:outputText> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Assigned Workout"/> </f:facet> <h:outputText value="#{seworkoutDescription}"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Completed "/> </f:facet> <h:selectBooleanCheckbox value="#{secompleted}" /> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Personal Notes"/> </f:facet> <h:inputText value="#{sepersonalNotes}" disabled="#{secompleted}"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Trainer Notes"/> </f:facet> <h:inputText rendered="#{UserBeantrainer}" value="#{setrainerNotes}"/> <h:outputText rendered="#{!UserBeantrainer}" value="#{setrainerNotes}"/> </h:column> </h:dataTable>
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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
PART II
FIGURE 9-17 The detail portion of the page showing individual workout sessions
First off, notice that dataTable is value-bound to EditTrainingEventworkoutsessions of type List, which is a property of the saved EditTrainingEvent row object, as shown next:
value="#{EditTrainingEventworkoutsessions }"
Directly beneath the dataTable lies another usage of the custom scroller component It s used in exactly the same manner as before on the main page so its code is not shown You may notice that the dataTable also has its binding attribute set to #{EditTe_Backingdata}, which is also an instance of a UIData object in the backing bean Similar to the main page, the UIData instance along with the backing bean scroll methods is necessary for the scroller component to function
Conditionally Rendering UI Components
A subtle yet nice feature of how the table of the workout sessions renders is that when a particular workout session has been completed (that is, the checkbox is checked) the Personal Notes input field changes its rendering from editable to disabled This is easily achieved by setting the disabled attribute to the boolean value of the secompleted field, as shown next:
<h:inputText value="#{sepersonalNotes}" disabled="#{secompleted}"/>
The other important conditional-rendering example to notice is the last column, where either an outputText or inputText is rendered based on whether or not the current user is a trainer The rendered attribute of the component is set to the EL expression of the boolean property trainer, as in the following:
<h:inputText rendered="#{UserBeantrainer}" value="#{setrainerNotes}"/>
If UserBeantrainer is true, then the input field is rendered If false, then a corresponding output field is rendered:
<h:outputText rendered="#{!UserBeantrainer}" value="#{setrainerNotes}"/>
As you can probably guess, changing the trainer s comment field to editable could also be done by simply using one inputText field with its disabled attribute set to the boolean value determined by whether the user is a trainer However, for this example, separate UI components are used to show usage of the rendered attribute
Part II:
Extending JavaServer Faces
In general, as you become more proficient in building JSF applications, you ll find that conditionally rendering UI components by setting the rendered attribute to EL expressions is an extremely useful and common practice
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