visual basic 6.0 barcode generator The Navigation Model in Java

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The Navigation Model
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Let s recall the registerxhtml page from 2, with the important markup shown in bold face
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/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>A Simple JavaServer Faces Registration Application</title> </h:head> <h:body> <h:form> <h2>JSF Registration App</h2> <h4>Registration Form</h4> <table>Irrelevant content not shown</table> <p><h:messages /></p> <p><h:commandButton value="Register" action="confirm" /></p> </h:form> </h:body> </html>
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When the Register button is pressed, the navigation rule system looks for a page within the application whose extension is the same as the current page and whose filename is confirm In this case, confirmxhtml does exist, and it contains the following navigation components:
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<h:commandButton value="Edit" action="register" /> <h:commandButton value="Confirm" action="#{userBeanaddConfirmedUser}" />
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If the user clicks the Register button, he or she is taken back to the registerxhtml page If the user clicks the Confirm button, an action is invoked The Confirm button specifies an action method, addConfirmedUser( ), that determines the outcome programmatically in the logic of the method This method is shown here:
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public String addConfirmedUser() { boolean added = true; // actual application may fail to add user FacesMessage doneMessage = null; String outcome = null; if (added) { doneMessage = new FacesMessage("Successfully added new user"); outcome = "done"; } else { doneMessage = new FacesMessage("Failed to add new user"); outcome = "register"; } FacesContextgetCurrentInstance()addMessage(null, doneMessage); return outcome; }
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For this simple case, addConfirmedUser( ) causes a message stating Successfully added new user to be displayed on the page and returns done as the outcome This will cause the implicit navigation to take the user to the donexhtml page
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The JavaServer Faces Framework
The absolute minimum you need to know about JSF navigation can be listed in four bullet points There are certain components you can put in the page that cause navigation to happen when they re pressed JSF has the h:commandButton, h:commandLink, h:button, and h:link components built in The markup for these components must include an action attribute (in the case of h:commandButton and h:commandLink) or an outcome attribute (in the case of h:button and h:link) The value of that attribute can either be a literal string, hard-coded into the page, or an EL expression that points to a method that returns a String (or actually any Java Object with a toString( ) method) If a page exists for the value of the attribute, that page will be navigated to when the component was pressed With just this information you can get a whole lot done This is the benefit of implicit navigation The rest of the chapter will explain the JSF navigation feature in detail
Overview of the JSF Navigation System
If the implicit navigation feature doesn t provide enough flexibility, the navigation rule system offers everything you need Those familiar with Jakarta Struts will find the JavaServer Faces Navigation Model somewhat similar in that all the navigation rules can be stored in a single XML configuration file However, where Struts defines a series of navigable application nodes in the form of Actions and Forwards in its configuration file, JavaServer Faces builds navigation rules that link actual pages directly to each other using a series of rules A clear benefit of having all of the JSF navigation rules residing in a single XML file is that it makes navigation very tool friendly In addition to the previously shown JDeveloper, there are now a growing number of JSF development tools that offer visual navigation design These tools allow developers to design all of the navigation in a JSF application by simply drawing or linking the pages together in a visual environment Another benefit of centralized navigation rules is improved application management Consider the classic problem when a page is renamed, such as changing registerxhtml to registrationhtml, and all associated links in other pages referring to the old name need to be revised with the new name This problem does not occur when using the JSF Navigation Model, since all of the navigation rules with references to the old page name can easily be changed in one operation, in one file (faces-configxml) This is obviously easier and less error-prone than editing all of the hard-coded references in multiple pages However, there are many times, when prototyping for example, that hard-coding references is just so compellingly easy, it s the right thing to do In that case, the implicit navigation feature is there for you JavaServer Faces navigation is also tightly integrated into its event model This approach enables it to handle both static and dynamic navigations In contrast to a static navigation (case), which is hard-coded into your faces-configxml, the navigation path for a dynamic link is determined at runtime This is done by specifying navigation conditions (or cases) into the navigation rule for the different expected results of a Java action method
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