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Listing 8-4. The Eshopx Files css eshop.jspx (replaces eshop.css) images (content unchanged) jsp (all pages rewritten as XML documents) BookDetails.jspx Checkout.jspx LeftMenu.jspx OrderConfirmation.jspx SearchOutcome.jspx SelectCatalog.jspx ShoppingCart.jspx TopMenu.jspx META-INF (content unchanged) WEB-INF web.xml (minor update) classes eshop (ShopServlet unchanged) beans (content unchanged) model (content unchanged) tags (new folder) AddBookTag.class, AddBookTag.java BookDetailsTag.class, BookDetailsTag.java BooksInCartTag.class, BooksInCartTag.java BooksInCategoryTag.class, BooksInCategoryTag.java CategoryNameTag.class, CategoryNameTag.java DeleteBookTag.class, DeleteBookTag.java InsertOrderTag.class, InsertOrderTag.java RoundToCentTag.class, RoundToCentTag.java SearchResultsTag.class, SearchResultsTag.java UpdateBookTag.class, UpdateBookTag.java tlds (new folder) eshop.tld As you can see, we only changed the view part of the application (i.e., the JSP modules), while we didn t need to touch the controller and the model (i.e., the servlet, the beans, the peer classes, and the data manager). As we already mentioned, the views of Eshop and Eshopx differ in the implementation but are functionally identical.

What is the initial symbol value displayed to the user You can link a web bean to UI Input component (see Figure 2 5). That is, on rendering, the UI Input component will evaluate the EL expression and use the result as the initial value.

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This allows an administrator to mark areas as off-limits to editors, who would otherwise be free to change or delete them at will The confirmation, or explicit approval by a user of a deletion or irrevocable change to information in the application, is another protection against accidental data loss In this case, it prevents impulsive behavior, forcing the user to think twice before acting once But the confirmation mechanism in an online application also protects the user against being the unwitting agent of a cross-site scripting attack An editor who, upon visiting another site, suddenly finds himself looking at a form requesting his permission to delete material in your application, will, we trust, have the presence of mind to cancel the action and report the attempted attack Locking and confirmation are traditional software solutions to user clumsiness in desktop operating systems.

We ve replaced the shop.css file used in Eshop with shop.jspx. Listing 8-5 shows the differences between the two files.

b1 sym: MSFT U View Root I 2: When it needs to get the initial value to display, it reads the "sym" property. Let's suppose that the value is "MSFT."

Files can be locked in read-only mode to prevent accidental modification, and all users are familiar with the Are you sure dialog box that pops up when they try to overwrite a file In online, multiuser applications, however, these techniques also take on important defensive roles against unauthorized corruption of data..

Listing 8-5. shop.jspx < xml version="1.0" encoding="ISO-8859-1" > <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:c="http://java.sun.com/jsp/jstl/core" version="2.1" > <jsp:directive.page language="java" contentType="text/css; charset=ISO-8859-1" pageEncoding="ISO-8859-1" /> <c:url var="imgUrl" value="/images"/> <jsp:text> ---------- shop.css lines 1 - 42 ---------background: url(${imgUrl}/bg_header.gif) no-repeat top left; ---------- shop.css lines 44 - 82 ---------background: url(${imgUrl}/bg_menu.gif) repeat-y top left; ---------- shop.css lines 84 - 105 ---------background: url(${imgUrl}/menubar.gif) repeat-x bottom left; ---------- shop.css lines 107 - 206 (the last one) ---------</jsp:text> </jsp:root> As you can see, we only wrapped shop.css inside a jsp:text element and changed three lines. If you look at the original lines, it should become clear why we did it: background: url(/eshop/images/bg_header.gif) no-repeat top left; background: url(/eshop/images/bg_menu.gif) repeat-y top left; background: url(/eshop/images/menubar.gif) repeat-x bottom left; The string "/eshop/images" of shop.css has become "${imgUrl}" in shop.jspx, and if you look at the beginning of shop.jspx, you ll notice that the variable imgUrl is set as follows: <c:url var="imgUrl" value="/images"/> The advantage of doing it with the EL expression is that c:url takes care of adding the application folder (i.e., /eshop) before the relative URL /images. This makes it possible to deploy the application in any folder. You should try to avoid hard-coding paths. Obviously, you need to change the way in which the style sheet is loaded in the JSP modules. In Eshop, with shop.css, you needed to include the following line in the <head> element: <link rel="stylesheet" href="/eshop/css/eshop.css" type="text/css"/> In Eshopx, with shop.jspx, you need to write this line: <c:url var="cssUrl" value="/css/eshop.jspx"/>

U Input I value: #{b1.sym}

and then include the following line in the <head>: <link rel="stylesheet" href="${cssUrl}" type="text/css"/> By doing so, you remove the hard coded /eshop path from all JSP modules, which is good.

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