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The JavaServer Faces Framework
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In addition to rendering a response to the client, the Render Response phase also saves the View component tree for future requests 3 User corrects validation errors and resubmits the form Upon seeing the error messages in the response, the user corrects the form by supplying a last name and entering a properly formatted date value and resubmits This time, as the request is processed, the Restore View phase restores the saved View tree and proceeds to the Apply Request Values phase, where the new values are applied to the View component tree The phase transitions to the Process Validations phase, where this time no validation or conversion errors are encountered The Update Model Values phase is then triggered At this point, the managed bean s (UserBean) properties are now updated with the new values that were submitted in the form, as illustrated in Figure 3-11 Once the Update Model Values phase completes, the next phase that is triggered is the Invoke Application phase Recall that the Invoke Application phase provides a way for JSF developers to invoke any custom logic For example, the application may need to execute code to query a database The way this is performed is through action methods, which are invoked during the Invoke Application phase, but only if any action events are in the queue,
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UIViewRoot HtmlOutputBody HtmlForm HtmlInputText HtmlMessage HtmlInputText HtmlMessage HtmlSelectOneRadio UISelectItem UISelectItem HtmlMessage HtmlInputText HtmlMessage UserBean #{userBeanfirstName} #{userBeanlastName} #{userBeansex} #{userBeandob} #{userBeanemail} #{userBeanserviceLevel} HtmlSelectOneMenu UISelectItem UISelectItem UISelectItem HtmlMessage HtmlCommandButton HtmlOutputHead
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Updating the UserBean Model object with the validated values
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The JavaServer Faces Request Processing Lifecycle
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such as when a button or link is clicked With the JSFReg example, an action event is queued when the Register button is clicked, but since the action attribute of the Register button (UICommand component) is hard-coded to the literal value register, no custom action method will be invoked and the Invoke Application phase completes At this point the navigation handler processes the action event, and a navigation will occur The result of the navigation event will then be displayed in the final Render Response phase Let s review that again Once the registration page has successfully passed validation and the UserBean managed bean has been updated with the values submitted in the form, the lifecycle comes to the Render Response phase, where a formatted response needs to be sent back to the user At this point, the response to be sent back to the client has to be determined The navigation handler is responsible for determining whether to simply respond with the same page, or to navigate to a new page Recall that the JSFReg example has an action attribute hard-coded to register, and since this corresponds to a navigation rule (case) defined in the faces-configxml file, a response will be rendered of the new page being navigated to (confirmxhtml) Remember that if either the registration button did not have its action attribute set or there was no corresponding navigation rule, the response rendered would simply be the same page and no navigation would occur Figure 3-12 illustrates how the NavigationHandler uses the rules defined in the faces-configxml to determine if a navigation is needed
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PARTIII PART PART
NOTE A detailed description of the Faces Navigation Model is provided in 6
Application action Passes action outcome register to the NavigationHandler NavigationHandler calls handleNavigation()
Is register an expected outcome in navigation case No Stay on same view, registerxhtml
Navigate to new view, confirmxhtml, using facesContextsetViewRoot()
FIGURE 3-12
Rendering a response based on the outcome of an action in the Invoke Application phase
Part I:
The JavaServer Faces Framework
Advanced Topics Related to the Request Processing Lifecycle
Now that you ve seen how the JSF request processing lifecycle works under default circumstances for a basic form, let s look at some of the slightly more complex examples
Using the immediate Attribute
An extremely important feature of Faces is the immediate attribute It allows more flexibility in how the lifecycle executes The following sections present an overview
Processing Action Events Immediately
Suppose you want to add a Cancel button to the registration page so that clicking on the button would immediately route users back to a mainxhtml page regardless of what was entered in the form First, we ll need to add the mainxhtml page
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://www w3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml" xmlns:h="http://javasuncom/jsf/html" xmlns:f="http://javasuncom/jsf/core"> <h:head> <title>Please Register</title> </h:head> <h:body> <p><h:link outcome="register">Click here to register</h:link></p> </h:body> </html>
Note that this page uses the new <h:link> component This element renders a regular HTML link that does not cause a JSF postback when clicked Therefore it can be used outside of an <h:form> element Now that you have added a mainxhtml page, you have to add an implicit navigation that returns back to the main page by putting a button or link component onto the page with an action set to main Here is the new Cancel button added to the Register page with the hard-coded action set to cancel :
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