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Defining navigation rules |
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Defining page navigation involves determining which page to go to after the user click a button or a link. Navigation for the application is defined in the application configuration resource file faces-config.xml using a rule-based system. Here the faces-config.xml file defines a navigation rule that tells JSF what to do when the user clicks one of the command buttons of the page whose path is specified within <from-tree-id>.
There are two navigation cases defined within separate elements because our page contains two buttons generated with . Each of them has an ID, a label, a command name:
A fragment of JSF page with form and command buttons:
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core" %>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html" %>
..........
<f:use_faces>
<h:form formName="manageAccount">
..........
<p>
<h:command_button id="withdraw" label="Withdraw money" action="withdraw"/>
<h:command_button id="deposit" label="Deposit money" action="deposit"/>
</h:form>
</f:use_faces>
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A navigation resource file:
..........
<faces-config>
<navigation-rule>
<from-tree-id>manageaccount.jsp</from-tree-id>
<navigation-case>
<from-outcome>withdraw</from-outcome>
<to-tree-id>withdraw.jsp</to-tree-id>
</navigation-case>
<navigation-case>
<from-outcome>deposit</from-outcome>
<to-tree-id>deposit.jsp</to-tree-id>
</navigation-case>
</navigation-rule>
..........
</faces-config>
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