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To allow the user to submit the form and initiate the JSF lifecycle, a commandButton UI component is added to the page using:
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<h:commandButton value="Click Here"/>
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FIGURE 1-2 The JSF request processing lifecycle
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1:
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An Introduction to JavaServer Faces
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Since the JSF lifecycle utilizes the JavaBeans event model, the user simply clicks on the rendered command button at runtime and the JSF lifecycle automatically updates the JavaBean s username property with the value provided in the input field! More in-depth coverage of the JSF request processing lifecycle as well as JSF s expression language is detailed in later chapters
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PART I PART I PART I
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The JSF Navigation Model
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Like Struts, JSF follows a Model-View-Controller design paradigm Recall that an MVC application is segmented into three distinct application components: The Model, which contains the business logic or non-UI code The View, which is all the code necessary to present a UI to the user The Controller, which is a front-end agent that directly handles the user s requests and dispatches the appropriate view These three elements, also depicted in Figure 1-3, combine to produce an architecture that yields distinct, separately maintainable code JavaServer Faces from the start was created to adhere precisely to the MVC design methodology It does so by providing a clean way to separate presentation (View) code from the back-end business logic (Model) code It also provides a front-end (Controller) servlet that handles all Faces requests and dispatches them, along with the necessary application data, to the appropriate View component (page) As you have seen, the View segment of a JSF application is created using JSF-enabled JSP pages with UI components The Model is bound to methods and properties in managed beans specified in the faces-configxml Now, let s take a look at how the Faces Controller works in a JSF application As mentioned before, the Faces Controller is implemented as a servlet that responds to all requests conforming to a certain URL pattern, such as /faces/*, as defined in the web xml A request that uses the appropriate Faces URL pattern can be considered a Faces request and when received by the Faces Controller, it processes the request by preparing an object known as the JSF context, which contains all accessible application data and routes the client to the appropriate View component (page) The rules that the controller uses for routing these requests are centrally managed in the faces-configxml file and are known as the JSF Navigation Model
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FIGURE 1-3
The Model-View-Controller design paradigm
Part I:
The JavaServer Faces Framework
The JSF Navigation Model is an elegant solution for keeping track of all navigations in the entire JSF application This greatly improves the manageability of the application because it is easier to maintain a central navigation model rather than having to update multiple page links in multiple pages The central location of the navigation model in an XML file is also very tool friendly in that vendor tools now offer visual ways to easily define JSF navigation models The navigation model is based on a set of navigation rules, which define a from page (from-view-id) and one or many to navigation cases Each navigation case has an associated outcome and to page (to-view-id) For example, to navigate from page1 to page2 when the outcome success is encountered, the following rule is specified in the faces-configxml:
<navigation-rule> <from-view-id>/page1jsp</from-view-id> <navigation-case> <from-outcome>success</from-outcome> <to-view-id>/page2jsp</to-view-id> </navigation-case> </navigation-rule>
As you can guess, a second navigation case can be defined for a failure outcome that will route the viewer to page3jsp
<navigation-rule> <from-view-id>/page1jsp</from-view-id> <navigation-case> <from-outcome>success</from-outcome> <to-view-id>/page2jsp</to-view-id> </navigation-case> <navigation-case> <from-outcome>failure</from-outcome> <to-view-id>/page3jsp</to-view-id> </navigation-case> </navigation-rule>
The next question you re wondering is, How is an outcome determined This can either be hard-coded, or derived dynamically from the return value of a method that is triggered when a button is clicked As you recall, UI components can be bound to both properties and methods so it is possible to associate a button click with a specific method in a managed bean, which can then return an outcome as a String value The JSF event model then processes this outcome String value and follows any navigation case defined in the navigation model that corresponds to the outcome of the method Now that you know the history and theory behind JSF, and have seen a very simple example of a working JSF page, it s time to review a more detailed JSF example application 2 develops a short, yet practical registration form example that exercises many of the key features of JavaServer Faces It will also serve as one of several modules of a more intricate Virtual Trainer example application, which will be introduced in Part II of this book
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