Java EE 6 Pocket Guide by Arun Gupta

Author:Arun Gupta [Arun Gupta]
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Programming Languages / Java
ISBN: 9781449336677
Publisher: O'Reilly Media
Published: 2012-09-09T16:00:00+00:00

Composite Components

Using features of Facelets and Resource Handling, JSF defines a composite component as a component that consists of one or more JSF components defined in a Facelets markup file. This .xhtml file resides inside of a resource library. This allows you to create a reusable component from an arbitrary region of a page.

The composite component is defined in the defining page and used in the using page. The defining page defines the metadata (or parameters) using <cc:interface> and the implementation using <cc:implementation>, where cc is the prefix for the http://java.sun.com/jsf/composite/ namespace. Future versions of the JSF specification may relax the requirement to specify metadata, as it can be derived from the implementation itself.

A composite component can be defined using JSF 1.2 as well, but it requires a much deeper understanding of the JSF lifecycle and also authoring multiple files. JSF2 really simplifies the authoring of composite components using just an XHTML file.

Let’s say a Facelet has the following code fragment to display a login form:

<h:form> <h:panelGrid columns="3"> <h:outputText value="Name:" /> <h:inputText value="#{user.name}" id="name"/> <h:message for="name" style="color: red" /> <h:outputText value="Password:" /> <h:inputText value="#{user.password}" id="password"/> <h:message for="password" style="color: red" /> </h:panelGrid> <h:commandButton actionListener= "#{userService.register}" id="loginButton" action="status" value="submit"/> </h:form>

This code renders a table with two rows and three columns, as shown in Figure 7-1.

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