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Facelets

Facelets. Çağatay Çivici Apache MyFaces PMC cagatay@apache.org. Çağatay Çivici. Apache MyFaces Project PMC Member OpenLogic Expert Group Member Sourceforge jsf-comp project developer JSF Client Side Validators Acegi Security Framework’s JSF Components

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Facelets

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  1. Facelets Çağatay Çivici Apache MyFaces PMC cagatay@apache.org

  2. Çağatay Çivici • Apache MyFaces Project PMC Member • OpenLogic Expert Group Member • Sourceforge jsf-comp project developer • JSF Client Side Validators • Acegi Security Framework’s JSF Components • JFreeChart for JSF : JSF Chart Creator • FacesTrace: Visual Debugger of JSF

  3. Agenda • JSF and JSP • Facelets • Jsfc and inline texts • Templating • Composition Components • EL Functions • JSTL Support • Custom Logic Tags

  4. JSF and JSP • JSP is the default view technology • JSP tags refer to JSF components • h:commandButton = HtmlCommandButton • Mixing them brings overhead because of two different lifecycles

  5. JSF and JSP (Advantages) • JSP is well adopted, reduces learning curve of JSF. • Above is the only advantage

  6. JSF and JSP (Disadvantages) • JSP is created to generate dynamic output not to create component trees • Two different lifecycles (overhead) • Content Interweaving Issues

  7. JSF and JSP • JSF 1.1 - Initial request (e.g. index.jsf) • FacesServlet gets the request and JSF lifecycle begins • restoreState returns null and a new view is created (createView) with view id = index.jsp (jsp is the default suffix) • lifecycle jumps to renderResponse • renderView is called that dispatches index.jsp to the container • Container traverses all the tags, tags call component’s encode methods during component tree is created • State is saved via writeState and buffered output is rendered to the client. • JSF 1.2 - a servletwrapper is used instead of f:view to buffer the content and component tree is created before rendering

  8. Facelets • A viewhandler purely created for JSF • No more JSP • .xhtml instead of .jsp • No tld files and no tag classes to defined a UIComponent • Faster than using JSP&JSF

  9. Migrating from JSP to Facelets • <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%> <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%> • <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">

  10. Installation • Add jsf-facelets.jar to the classpath • Add viewhandler config to faces-config.xml • Change javax.faces.DEFAULT_SUFFIX to .xhtml

  11. *.taglib.xml • Concept similar to tld but lightweight • Used to define components, converters, validators, composition components, custom logic tags, functions and etc.

  12. Jsfc • Jsfc : jwcid concepty in Tapestry • <h:commandButton id=“btn_save” value=“Save” action=“#{bean.method}” /> • <input jsfc="h:commandButton" type="submit" id=“btn_save" value=“Save“ action=“#{bean.method}”/> • Provides integration with HTML editors

  13. Inline Texts • Inline Text: Display texts without a UIComponent • <h:outputText value=“#{IndexPageBean.welcomeMessage}” /> • <h1>#{IndexPageBean.welcomeMessage}</h1>

  14. Support for Unified EL • Facelets support the Unified EL • #{BeanName.field} same as; • ${BeanName.field}

  15. Templating • A template is an xhtml with placeholders • Placeholders are marked with ui:insert • Fragment from Template.xhtml • <title> <ui:insert name="title">Default Title</ui:insert> </title> • In order to use the template ui:composition is needed. • Fragment from index.xhtml • <ui:composition template="/template.xhtml"> <ui:define name="title"> Welcome to index page </ui:define>

  16. Composition Components • Composition component is basically a template • userInfo.xhtml • <ui:composition xmlns:ui="http://java.sun.com/jsf/facelets"> <h3>Logged as : #{user}</h3> </ui:composition> • myfacelets.taglib.xml • <tag> <tag-name>userInfo</tag-name> <source>tags/userInfo.xhtml</source> </tag> • Use as; • <ds:userInfouser="#{myBean.currentUser}"/>

  17. EL Functions • MyFunctions.java • publicstatic String length(String name) { if( name == null ) returnnull; else return String.valueOf( name.length() ); } • myfacelets.taglib.xml • <function> <function-name>length</function-name> <function-class>faceletsbox.utils.CustomerUtils</function-class> <function-signature> java.lang.String length(java.lang.String) </function-signature> </function> • Use as; • #{ds:length(MyBean.userName)}

  18. JSTL Support • With JSP, mixing JSF and JSTL is problematic • Facelets brings limited but faultless support • <c:if> • <c:forEach> • <c:catch> • <c:set>

  19. Custom logic tags • JSTL like logic tags by extending Facelets TagHandler • myfacelets.taglib.xml • <tag> <tag-name>if</tag-name> <handler-class>mycompany.myproject.utils.IfHandler</handler-class> </tag> • Use as; • <ds:if test="#{MyBean.isLoggedIn}"> Welcome </ds:if>

  20. List of built-in Facelets tags • <ui:component/> • <ui:composition/> •  <ui:debug/> •  <ui:decorate/> • <ui:define/> • <ui:fragment/> • <ui:include/> • <ui:insert/> • <ui:param/> • <ui:remove/> • <ui:repeat/>

  21. Summary • Facelets saves JSF from the burden of JSP • Great for templating and composition components plus bonuses like el functions • IDE support is not wide, only Exadel support facelets for now

  22. The End – Questions? • cagatay@apache.org • www.jroller.com/page/cagataycivici

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