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Note An introductory video session on Out of Browser functionality by Tim Heuer is available on Silverlight.net.

Let s review how to add the footer. First, you create the _footer.gsp template and locate it in the grails-app/views/common directory. Second, you add the _footer.gsp template to the layout using the <g:render template="/common/footer" /> tag. Third, you style the footer by adding a <div> section to the main layout using a style class that you defined in the main.css. Now, you are going to take what you learned by creating the footer and start building the login/logout functionality.

${var: MESSAGE}

The Silverlight 3 local messaging feature allows Silverlight applications to communicate across different Silverlight plug-ins/applications. These Silverlight plug-ins/applications can be hosted on the same page, on different browser tabs, in different browsers, or in the Out of Browser application. To establish a local connection and perform communications between Silverlight applications executed on the client side only, no server-side round-trips are required. Figure 14-12 explains the communication process between Silverlight applications through a flow diagram.

You create the topbar by adding a topbar (_topbar.gsp) template to the main layout. The topbar template is common and should be located in the grails-app/view/common directory. Listing 5-5 shows the content of the topbar template.

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If var is unset (or, with the colon, null), an error or MESSAGE will be printed. If the shell is not interactive (as in the case of a script), it will exit. $ unset var $ echo ${var } bash: var: parameter null or not set $ echo ${1 No value supplied} bash: 1: No value supplied

Listing 5-5. The Topbar Template (_topbar.gsp)

Send Message Scope Specific Domain or Global Domain (System.Windows.Messag ing.LocalMessageSender. Global)

01 02 03 04 05 06 <div id="menu"> <nobr> <g:if test="${session.user}"> <b>${session.user .firstName} ${session.user .lastName}</b> | <g:link controller="user" action="logout">Logout</g:link> </g:if>

The expansions introduced by ksh, and adopted by POSIX, perform string manipulations that were once the province of the expr command. In these expansions, PATTERN is a file-globbing pattern, not a regular expression.

As shown in Figure 14-12, the newly introduced System.Windows.Messaging namespace, which is a Microsoft .NET Framework library component for Silverlight, facilitates local messaging between two Silverlight applications. The System.Windows.Messaging namespace provides the required set of classes to support local messaging between two Silverlight applications on the client side. Table 14-2 describes the key classes of this namespace.

07 08 09 10 11

This expansion returns the length of the expanded value of the variable: $ var=LENGTH $ echo ${#var} 6

LocalMessageSender LocalMessageReceiver MessageReceiveEventArgs SendCompletedEventArgs ListenFailedException SendFailedException

Listing 5-5 uses three Grails tags that you haven t seen yet: <g:if>,3 <g:else>,4 and <g:link>.5 The <g:if> and <g:else> tags work together to create if-then-else logic. The <g:link> tag creates a hypertext link (i.e., http://localhost:8080/collab-todo/user/logout). In lines 3 6, you check if the session has a User object. If the session has a User object, the user s name followed by a | and a Logout link is printed. Lines 7 9 shows the else condition of the if statement, which displays the Login link. Listing 5-6 shows how to add the topbar to the main layout.

The variable is expanded, and the shortest string that matches PATTERN is removed from the end of the expanded value: $ var=usr/local/bin/crafty $ echo "${var%/*}" usr/local/bin

Listing 5-6. Enhancing the Main Layout for the Topbar (main.gsp)

Used on the sender Silverlight application side to send messages to the local Silverlight application receiver/listener Used on the receiver Silverlight application side to receive messages Provides data for the LocalMessageReceiver.MessageReceived event Provides data for the LocalMessageSender.SendCompleted event Occurs when a LocalMessageReceiver fails to receive a message Occurs when a LocalMessageSender fails to send a message

<html> . . . <body> <div id="spinner" class="spinner" style="display: none;"> <img src="${createLinkTo(dir:'images',file:'spinner.gif')}" alt="Spinner" /> </div> <div id="topbar"> <g:render template="/common/topbar" /> </div> <div class="logo"> <img src="${createLinkTo(dir:'images',file:'grails_logo.jpg')}" alt="Grails" /> </div> . . .

The variable is expanded, and the longest string that matches PATTERN from the end of the expanded value is removed: $ var=usr/local/bin/crafty $ echo "${var%%/*}" usr

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