Beginning Java EE 6 with GlassFish 3, Second Edition

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CHAPTER 11 ■ PAGES AND COMPONENTSThe thread of execution for a request/response cycle can flow through each phase or not, dependingon the request and what happens during the processing; if an error occurs, the flow of executiontransfers immediately to the render response phase. Note that four of these phases can generatemessages: apply request values, process validations, update model values, and invoke application. Withor without messages, it is the render response phase that sends output back to the user.Standard HTML ComponentsJSF’s architecture is designed to be independent of any particular protocol or markup language, and it isalso made to write applications for HTML clients that communicate via HTTP. A user interface for aparticular web page is created by assembling components. Components provide specific functionalityfor interacting with an end user (labels, tables, check boxes, etc.). JSF provides a number of componentclasses that cover most of the common requirements.A page is a tree of classes that extend javax.faces.component.UIComponent and has properties,methods, and events. The components in the tree have parent-child relationships with othercomponents, starting at the root element of the tree, which is an instance of UIViewRoot. Let’s focus onusing these components on web pages.CommandsCommands are controls that a user can click to trigger an action. Such a component is typically renderedas a button or a hyperlink. Table 11-10 lists the two command tags that can be used.Table 11-10. Command TagsTagDescriptionRepresents an HTML input element for a button of type submit or reset.Represents an HTML element for a hyperlink that acts like a submit button. Thiscomponent must be placed inside a form.If on your page you need to add submit buttons, reset buttons, images that you can click, orhyperlinks that trigger an event, do so as follows:A hyperlinkBy default, a commandButton is of type submit, but it can be changed to type reset (type="reset"). Ifyou want to turn a button into an image, don’t use the value attribute (that’s the name of the button),instead use the image attribute to specify the path of the image you want to display. Following is thegraphical result of the previous code:326
CHAPTER 11 ■ PAGES AND COMPONENTSBoth buttons and links have an action attribute to invoke a method on a managed bean. To call thedoNew() method of the bookController, use the expression language to specify it in the action attributeas follows:Create a new bookInputsInputs are components that display their current value to the user and allow the user to enter differentkinds of textual information. These can be text fields, text areas, or components to enter a password orhidden data. The input tags are listed in Table 11-11.Table 11-11. Input TagsTagDescriptionRepresents an HTML input element of type hidden (which is useful to propagatevalues outside of the session from page to page).Represents an HTML input element of type password. On a redisplay, anypreviously entered value will not be rendered (for security reasons) unless theredisplay property is set to true.Represents an HTML input element of type text.Represents an HTML text area element.Many web pages contain forms in which a user has to enter some data or log on using a password.Input components have several attributes that allow you to change their length, content, or look andfeel, as follows:327
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The EXPERT’s VOIce ® in Java tm
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Beginning Java EE 6 Platform with G
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Contents at a Glance■Foreword ...
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■ CONTENTSSummary ...............
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■ CONTENTSBulk Update ...........
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■ CONTENTSStateful . ............
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■ CONTENTSScripting Elements ....
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■ CONTENTSMDB Model .............
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■ CONTENTSFrom the Web to Web Ser
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About the Author■ Antonio Goncalv
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AcknowledgmentsWriting a book about
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■ PREFACECONTENTSChapter 1 briefl
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C H A P T E R 1■ ■ ■Java EE 6
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CHAPTER 1 ■ JAVA EE 6 AT A GLANCE
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CHAPTER 2 ■ JAVA PERSISTENCEJPA S
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CHAPTER 2 ■ JAVA PERSISTENCEEclip
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CHAPTER 2 ■ JAVA PERSISTENCEusing
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CHAPTER 2 ■ JAVA PERSISTENCEFigur
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CHAPTER 2 ■ JAVA PERSISTENCENote
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CHAPTER 2 ■ JAVA PERSISTENCE■ N
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CHAPTER 3 ■ OBJECT-RELATIONAL MAP
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C H A P T E R 4■ ■ ■Managing
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CHAPTER 4 ■ MANAGING PERSISTENT O
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C H A P T E R 5■ ■ ■Callbacks
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CHAPTER 5 ■ CALLBACKS AND LISTENE
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CHAPTER 6 ■ ENTERPRISE JAVA BEANS
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C H A P T E R 7■ ■ ■Session B
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CHAPTER 7 ■ SESSION BEANS AND THE
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C H A P T E R 8■ ■ ■Callbacks
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CHAPTER 8 ■ CALLBACKS AND INTERCE
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C H A P T E R 9■ ■ ■Transacti
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CHAPTER 9 ■ TRANSACTIONS AND SECU
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CHAPTER 12 ■ PROCESSING AND NAVIG
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CHAPTER 13 ■ SENDING MESSAGESFigu
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CHAPTER 13 ■ SENDING MESSAGESJava
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CHAPTER 13 ■ SENDING MESSAGES3.0.
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CHAPTER 13 ■ SENDING MESSAGESRunn
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CHAPTER 14 ■ SOAP WEB SERVICESFig
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CHAPTER 14 ■ SOAP WEB SERVICESapp
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CHAPTER 15 ■ RESTFUL WEB SERVICES
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■ INDEXApache Maven. See Mavenapp
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■ INDEXCD-BookStore application (
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■ INDEXDerby, 31-32installing, 32
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■ INDEXexpression language (EL),
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■ INDEXJava Archive (jar) files,
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■ INDEX tag, 176persistent class,
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■ INDEX■ Sscalar expressions in
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■ INDEXXHTML 1.0 Transitional, 30
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Beginning Java EE 6 with GlassFish 3, Second Edition

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