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| JSF Application |
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2-inputname.jsp:
<%@ taglib uri=”http://java.sun.com/jsf/
html” prefix=”h” %>
<%@ taglib uri=”http://java.sun.com/jsf/
core” prefix=”f” %>
<f:loadBundle
basename=”javajazzup.messages”
var=”message”/>
<f:view>
<html>
<head><title>enter your name page</
title></head>
<body>
<h:form>
<h1><h:outputText
value=”#{message.inputname_header}”/></
h1>
<h:outputText
value=”#{message.prompt}”/>
<h:inputText
value=”#{StoreNameBean.personName}” />
<h:commandButton
action=”result”
value=”#{message.button_text}” />
</h:form>
</body>
</html>
</f:view>
Description:
<%@ taglib uri=”http://java.sun.com/jsf/
html” prefix=”h” %>
<%@ taglib uri=”http://java.sun.com/jsf/
core” prefix=”f” %>
“taglib” directive is used to include JSF tag
libraries. First line tells where to find JSF html
tags that defines html elements and second
line tells where to find JSF core tags. A page
that contains JSF tags is represented by a tree of components. The root of this tree is
UIViewRoot. This root is represented by view
tag. So it is necessary to include all
component tags (tags representing UI components) within view tag. |
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<f:loadBundle basename=”
javajazzup.messages” var=”message”/>
This line loads our properties file (resource
bundle) that holds messages to be displayed
in the JSP page. Actually this file is a collection
of “param=value” pair. The name of this file is “messages.properties” in this application which is saved in /WEB-INF/classes/ javajazzup folder.
We will explain more about this in subsequent
section.
<h:form> tag is used to create html <form>
using JSF tag. Typically JSP page includes a
form, which is submitted when a button is
clicked. Form components must be used within <h:form> and </h:form>
<h:outputText
value=”#{message.inputname_header}”/>
This tag displays text on the page defined in
the value attribute by looking into the resource
bundle i.e. properties file (messages.properties). It looks the value for inputname_header
parameter in “message.properties” file and set
the value of it to value attribute. Finally this tag prints this value. So in this example this line
prints “Java Jazz Up”.
<h:outputText value=”#{message.prompt}”/
>
In this line the value of “prompt” param is looked
in “messages.properties” file and this tag prints
this value. So in this example this line prints “Enter Your Name:”
<h:inputText
value=”#{StoreNameBean.personName}” />
inputText tag is used to create input text box
component. The value attribute is connected
with the managed bean attribute. Here
StoreNameBean is the name of Bean and personName is the name of attribute of bean.
After pressing the submit button, bean gets
the value filled in the input text box. This bean
is nothing but a Java Bean that contains
attributes and setter and getter methods to |
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Oct 2007 | Java Jazz Up | 57 |
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