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Update Existing JSPs to Work with Layouts
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Once you have created the layout JSPs, the next step is to update your application s original JSPs to contain only the body content of their pages To do this, you must remove each of the pieces of the original page that were used to craft the common layout Following is the updated loginjsp page containing only body content:
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<%@ taglib prefix="f" uri="http://javasuncom/jsf/core" %> <%@ taglib prefix="h" uri="http://javasuncom/jsf/html" %> <h:form> <table> <tr> <td align="right">Username:</td> <td> <h:inputText id="username" value="#{LoginBeanusername}" required="true"/> </td> </tr> <tr> <td align="right">Password:</td> <td> <h:inputSecret id="password" value="#{LoginBeanpassword}" required="true"/> </td> </tr> <tr> <td></td> <td><h:commandButton value="Login" action="login"/></td> </tr> </table> </h:form>
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As you can see, the updated page no longer contains the header or footer portions of the content At runtime, the layout JSPs will surround the contents of this updated page with the common layout content to create the complete page
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20:
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The MyFaces Implementation and Component Library
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Create a tiles-defsxml File
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As mentioned, there are two ways to declare Tiles layouts: with Tiles tags in a master JSP that gets included into each of the layout JSPs or by declaring them in an XML configuration file This example uses the configuration file option because it is the most flexible and easyto-maintain approach Following is the tiles-defsxml file that declares the layouts This file should be placed inside your application s /WEB-INF/ folder
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< xml version="10" > <!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 11//EN" "http://jakartaapacheorg/struts/dtds/tiles-config_1_1dtd"> <tiles-definitions> <!-- Main Layout --> <definition name="mainlayout" path="/mainLayoutjsp"> <put name="title" value=""/> <put name="header" value="/headerjsp"/> <put name="body" value=""/> <put name="footer" value="/footerjsp" /> </definition> <!-- Login Page --> <definition name="logintiles" extends="mainlayout"> <put name="title" value="Login Page"/> <put name="body" value="/loginjsp"/> </definition>
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PART IV
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</tiles-definitions>
There are two Tiles definitions in this file The first definition in the file declares a layout named mainlayout The layout extension given to the definition s name is used to denote that it is a layout definition This is not a formal naming scheme; however, it is a simple way to distinguish the types of definitions Generally speaking, layout definitions specify the template for a page and the list of attributes whose values will be used to fill in the template Page definitions extend layout definitions and provide values for the attributes defined in the extended layout So, essentially, page definitions are instances of a layout with attributes set to the content for a specific page Remember that in order for the MyFaces Tiles View Handler to identify page definitions, they must have a tiles extension (this extension is configurable) Notice that the first definition defines four attributes with put tags These attributes will be available for use by the layout JSP specified by the path attribute The layout JSP uses these attributes to supply it with the locations of its content Additionally, attributes can be used to supply literal strings, as is the case with the title attribute This attribute will be used by mainLayoutjsp to enable a dynamic title based on the value set by page definitions that extend the layout definition
Part IV:
JavaSer ver Faces Tools and Libraries
The second definition in the file declares a page definition named logintiles This definition extends the mainlayout layout definition and supplies values for the attributes that don t have values in the layout definition This definition can override any of the attributes in the layout definition if so desired; however, only the title and body attributes are overridden in this case
Specify the Location of the Tiles Configuration File in the webxml File
After creating a tiles-defsxml file for your application, you must update your application s webxml file with a context parameter pointing to the Tiles definitions configuration file, as shown here:
<!DOCTYPE web-app PUBLIC -//Sun Microsystems, Inc//DTD Web Application 23//EN" http://javasuncom/dtd/web-app_2_3dtd"> <web-app> <!-- Tiles Configuration File --> <context-param> <param-name>tiles-definitions</param-name> <param-value>/WEB-INF/tiles-defsxml</param-value> </context-param> </web-app
The tiles-definitions context parameter is used to inform the MyFaces Tiles View Handler of the location of your Tiles definitions configuration file To use multiple Tiles definitions files, simply delimit them with commas (,) as shown here:
<param-value> /WEB-INF/tiles-defsxml, /WEB-INF/tiles-defs-2xml, /WEB-INF/tiles-defs-3xml </param-value>
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