Building a Simple JavaServer Faces Application in Java

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Building a Simple JavaServer Faces Application
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FIGURE 2-3 The JSFReg home page
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JSP to use the underlying JSF UI components in the page Keep in mind that JSF UI components are client-independent and can be used in different clients as long as there are corresponding renderers The specifics on UI component rendering will be covered in later chapters but for now, the main thing to know is that JSF is designed to work not only with traditional HTML browsers as the client, but other types of clients as well, such as PDAs and other devices After the taglib directives, the next thing you ll notice is the <f:view> and <h:form> tags These tags are the master parent tags of the entire page content We ll cover this in more detail in later chapters but basically the thing to remember here is that as a JSF page is rendered for a client (such as a browser), an identical component tree is instantiated into memory on the server with the View component at its root Moving on to the first real, usable UI components, you see:
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<h:commandLink action="register"> <h:outputText value="Click here to register"/> </h:commandLink>
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The <h:commandLink > is a JSP tag that invokes a JSF HtmlCommandLink UI component on the server, rendering an HTML hyperlink around any content in the body of the tag An interesting thing to note about this component is that it renders as a link, but acts like a button, causing a form submit In this case, the body of the tag is the child tag <h:outputText> that invokes an HtmlOutputText UI component, which simply renders the text from the value attribute to the client The final and most important thing to notice is the action attribute of the commandLink tag This is where the JSF event model comes in, as the action
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The JavaServer Faces Framework
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attribute of the tag actually describes how to process the event that gets fired when the link is clicked on Since the action attribute is set to register, an ActionEvent is passed to the JSF navigation model, where it will then look up a corresponding navigation case with the same from-outcome as register and follow its specified to-view-id navigation path To understand this better, let s take a look at the navigation rule in the faces-configxml that handles this register action The navigation rule that handles this outcome is as follows:
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<navigation-rule> <from-view-id>/mainjsp</from-view-id> <navigation-case> <from-outcome>register</from-outcome> <to-view-id>/registerjsp</to-view-id> </navigation-case> </navigation-rule>
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As you can see, this is a navigation rule that specifies a from-view-id or origin of mainjsp page and will navigate to the registerjsp page if a from-outcome event equals register as specified by the navigation case When the rendered hyperlink in the page is clicked, the action attribute, register, forces this from-outcome case to be register, thus enabling the navigation to registerjsp Now let s have a look at the core of this example application, the registerjsp page, which is shown in Figure 2-4 When rendered in a browser, the page resembles any typical registration page Upon examination of the source of the page, you ll first notice the same taglib directives for the Core and HTML JSF tag libraries as well as the surrounding <f:view> and <h:form> tags followed by a series of input tags that render the different form fields in the page You ll also notice that an HTML table is used to provide the layout structure of the form As we ll
FIGURE 2-4 The JSFReg registration form page
2:
Building a Simple JavaServer Faces Application
cover later on, JSF also has components that provide layout structure as well such as the <h: panelGrid>, which provides a similar layout to an HTML table but without requiring row and cell tags There is no requirement, however, to use one approach or the other
<%@ page contentType="text/html"%> <%@ taglib uri="http://javasuncom/jsf/core" prefix="f"%> <%@ taglib uri="http://javasuncom/jsf/html" prefix="h"%> <f:view> <html> <head><title>A Simple JavaServer Faces Registration Application</title></head> <body> <h:form> <h2>JSF Registration App</h2> <h4>Registration Form</h4> <table> <tr> <td>First Name:</td> <td> <h:inputText id="fname" value="#{UserBeanfirstName}" required="true"/> <h:message for="fname"/> </td> </tr> <tr> <td>Last Name:</td> <td> <h:inputText id="lname" value="#{UserBeanlastName}" required="true" /> <h:message for="lname"/> </td> </tr> <tr> <td>Gender:</td> <td> <h:selectOneRadio id="gender" value="#{UserBeangender}" required="true"/> <f:selectItem itemLabel="Male" itemValue="male"/> <f:selectItem itemLabel="Female" itemValue="female"/> </h:selectOneRadio> <h:message for="gender"/> </td> </tr> <tr> <td>Date of Birth:</td> <td> <h:inputText value="#{UserBeandob}" id="dob" required="true" > <f:convertDateTime pattern="MM-dd-yy"/> </h:inputText> (mm-dd-yy) <h:message for="dob"/> </td> </tr> <tr> <td>Email Address:</td> <td> <h:inputText id="email" value="#{UserBeanemail}" required="true" validator="#{UserBeanvalidateEmail}"/> <h:message for="email"/>
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