Beginning Java EE 6 with GlassFish 3, Second Edition

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CHAPTER 11 ■ PAGES AND COMPONENTSDOM provides a standard way to interact with XML documents. You can traverse the tree and editthe content of a node (a leaf of the tree). With some JavaScript, you can introduce dynamism into yourweb pages. As you will see in the next chapter, Ajax is based on JavaScript interacting with the DOMrepresentation of a web page.JavaScriptUntil now, you’ve seen different languages used to represent static content and graphical aspects of aweb page. But, often, a web page needs to interact with the end user by showing dynamic content. Asyou’ll see, dynamic content can be handled with server-side technologies such as JSP or JSF, butbrowsers can also do so by executing JavaScript.JavaScript is a scripting language used for client-side web development. Despite its name, it isunrelated to the Java programming language, as it is an interpreted, weakly typed language. JavaScript isa powerful way to create dynamic web applications by writing functions that interact with the DOM of apage. W3C standardized DOM, whereas the European Computer Manufacturers Association (ECMA)standardized JavaScript as the ECMAScript specification. Any page written with these standards(XHTML, CSS, and JavaScript) should look and behave mostly identically in any browser that adheres tothese guidelines.An example of JavaScript interacting with DOM is the newBook.xhtml page in Listing 11-4. This pagedisplays a form where you can enter information about a book. The price of the book needs to becompleted by the user on the client side before hitting the server. To do such a validation, you can createa JavaScript function (priceRequired()) that checks whether the price text field is empty or not.Listing 11-4. The newBook.xhtml Page with Some JavaScriptCreates a new bookfunction priceRequired() {if (document.getElementById("price").value == "") {document.getElementById("priceError").innerHTML = "Please, fill the price !";}}Creates a new book304
CHAPTER 11 ■ PAGES AND COMPONENTSISBN :Title :Price :Description :Number of pages :Illustrations :APress - Beginning Java EE 6In Listing 11-4, the priceRequired() JavaScript function is embedded in the page within a tag. This function is called when the price text field loses the focus (that’s what the onblur event does).The priceRequired() function uses the implicit document object that represents the DOM of the XHTMLdocument. The getElementById("price") method looks for an element that has an identifier called price() and checks whether it’s empty. If so, the function looks for another element calledpriceError (getElementById("priceError")) and sets the value to Please, fill the price !. If the priceis not completed, the client validation will display the message shown in Figure 11-4.305
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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 3 ■ OBJECT-RELATIONAL MAP
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C H A P T E R 4■ ■ ■Managing
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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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CHAPTER 13 ■ SENDING MESSAGESFigu
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CHAPTER 13 ■ SENDING MESSAGESJava
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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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