xdreceiverhtml: Cross-Domain Receiver for the Facebook JavaScript Client Library in Java

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Listing 86 xdreceiverhtml: Cross-Domain Receiver for the Facebook JavaScript Client Library
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Strict//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-strictdtd"> <html xmlns="http://wwww3org/1999/xhtml" > <head> <title>Cross-Domain Receiver Page</title> </head> <body> <script src="http://staticakfacebookcom/js/api_lib/v04/XdCommReceiverjs 2" type="text/javascript"></script>
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Listing 86
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</body> </html>
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The Facebook JavaScript Client Library can now communicate with our application To put the Add to Profile button on the page, we need to create a placeholder <div> that the Library can use Add the following bolded lines to the renderPage() function in index_iframephp, after the banner in the header block:
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<div class='banner' style='background: url("LOCAL_APP_URL"/img/bannerpng) no-repeat;' > <div id='buttons' class='clearfix' > <div id='addbutton'></div> </div> </div>
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Now, we need to add a script block that loads and initializes the Facebook JavaScript Client Library and tells it to replace the placeholder <div> with the Add to Profile buttonAdd the code in Listing 87 to the end of renderPage() in index_iframephp, just before the </body> tag
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Listing 87 index_iframephp: Using the Facebook JavaScript Client Library to Show the Add to Profile Button
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$pageOutput = " <script src='http://staticakfacebookcom/js/api_lib/v04/FeatureLoaderjsphp' type='text/javascript'></script> <script type='text/javascript'> FB_RequireFeatures(['XFBML'], function() { FBFacebookinit('"FB_API_KEY"', 'xdreceiverhtml', null); FBConnectshowAddSectionButton('profile', documentgetElementById('addbutton')); FBConnectshowAddSectionButton('info', documentgetElementById('infobutton')); }); </script> </body> </html> ";
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This loads the Facebook JavaScript Client Library, requiring that it loads all the necessary parts to display XFBML It initializes it with the application API key and the location of the xdreceiverhtml file, relative to the root It then calls showAddSectionButton() with the placeholder <div>As with all XFBML, this code runs on the client, so there might be a slight delay as the library renders the new button HTML 12 details how the Facebook JavaScript Client Library works
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It is time to test the profile boxes Go to your application and click the Add to Profile button on either the FBML or IFrame tab Click Add, which takes you to your profile Click Keep to accept the new profile boxTry moving it from the Wall to the Boxes tab and from the Narrow to the Wide side See how the layout changes with each location
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Application tabs are a way for applications to display profile content in a much larger spaceThey behave mostly like profile boxes, but are 760px wideApplication tabs are populated via a callback instead of presetting the content once via profilesetFBML() This callback is used the first time a user goes to that tab on his profileAs long as he is still on his profile, switching back to that tab uses a cached version When an application supports an application tab, the user can click the + at the right side of his profile tab list and select it from a list to add the tabThe name of the tab is limited to 11 characters, and it can be different than the application name To allow users to add an application tab, you need to update the Developer Settings Go to the Profiles tab and fill in Compliments for the Tab Name and apptabphp for the Tab URLThen, create a new file called apptabphp in the application root directory and add the contents of Listing 88This file is the handler for the application tab callback and reuses functionality from profileinc to help generate the FBML
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Listing 88
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dirname(__FILE__)'/inc/globalsinc'; dirname(__FILE__)'/inc/dbinc'; dirname(__FILE__)'/inc/utilsinc'; dirname(__FILE__)'/inc/profileinc';
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dumpRequestVars(true, basename(__FILE__)); $facebook = new Facebook(FB_API_KEY, FB_APP_SECRET); $generatedProfileFBML = generateProfileBoxFBML($facebook->profile_user); $appTabFBML = $generatedProfileFBML['tab']; echo $appTabFBML; >
This code calls the generateProfileBoxFBML() function to get the FBML for the tab and then echoes it outWe need to update profileinc with the content of Listing 89 to add the tab specific contentAdd the $appTabHeaderBlock section just after the $headerBlock in the file and add the $tabContent section after $mainContent
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Listing 89
Application Tab Updates for profileinc
$appTabHeaderBlock = " <style> $styles </style> <div class='subtitle'> <a href='"FB_APP_URL"'> Send a Compliment to a Friend </a> </div>"; $tabContent = " <div class='tab'> <div class='profileContent'> <img class='banner' src='"LOCAL_APP_URL"/img/bannerpng'/> $formBlock </div> </div>"; $profileText['tab'] = $appTabHeaderBlock $tabContent;
Application tabs do not support the <fb:subtitle> tag we used for the profile boxes, so we need to manually create the linkWe also need a larger banner image, so we will use the same one as the canvas page Just like the other profile boxes, we enclose the FBML in a <div> with the class tab so that we can apply custom stylesAdd the styles in Listing 810 to profilecss