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<script type="text/javascript" src="http://staticakconnectfacebookcom/js/api_lib/v04/FeatureLoaderjsphp"> </script> <fb:login-button onlogin="windowlocation='http://examplecom/loggedinphp';"> </fb:login-button> <script type="text/javascript"> var apiKey = 'XXXXXXXXXXXXXX'; var xdReceiverPath = 'xd_receiverhtml'; FBinit(apiKey, xdReceiverPath); FBensureInit( function() { }); </script>
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Examples of login buttons using the various sizes and lengths are located at http:// wikidevelopersfacebookcom/indexphp/Facebook_Connect_Login_Buttons You can create your own login button and handle the click with JavaScript, but you must use a Facebook-provided image for the button In the onclick() handler, call FBConnectrequireSession() Listing 136 shows the code for displaying a login button without using the XFBML tag In most cases, however, <fb:login-button> is what you use
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<script type="text/javascript" src="http://staticakconnectfacebookcom/js/api_lib/v04/FeatureLoaderjsphp"> </script> <a href="#" onclick="FBConnectrequireSession(function(){ windowlocation='http://examplecom/loggedinphp';});" > <img src="http://staticakfbcdnnet/images/fbconnect/login-buttons/ connect_light_large_shortgif" /> </a> <script type="text/javascript"> var apiKey = 'XXXXXXXXXXXXXX'; var xdReceiverPath = 'xd_receiverhtml'; FBinit(apiKey, xdReceiverPath); FBensureInit( function() { }); </script>
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When a user logs out of a Facebook Connect site, he also logs out of Facebook Depending on how you have integrated Facebook Connect into your existing user management system, you might want to give users the ability to manually log outThere are a few ways to do this One option is to use <fb:login-button> with autologoutlink set to trueThis pairs well with passing the reloadIfSessionStateChanged parameter to FBinit(), so that, after the user clicks logout, the page reloads to display the logged-out state Another option is to provide your own button or link, and call either the FBConnectlogout() or FBConnectlogoutAndRedirect() function when a user clicks it FBConnectlogout() takes a callback function, which you can use to handle any site-specific logout logic, while FBConnectlogoutAndRedirect() takes a URL that users are directed to after the session logout occurs Listing 137 shows a simple example of handling login and logout and appropriately displaying the <fb:login-button> or logout linkThe displayLoggedIn() and displayLoggedOut() functions passed to FBinit() are called immediately after the session state is detected by the Connect library and shows the login or logout linksWhen a user clicks the login or logout buttons, the handleLogin() or handleLogout() functions are called, which can handle any site cleanup and then display the opposite button
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Listing 137 Handling Login and Logout
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<script type="text/javascript" src="http://staticakconnectfacebookcom/js/api_lib/v04/FeatureLoaderjsphp"> </script> <script type="text/javascript">
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var apiKey = 'XXXXXXXXXXXXXX'; var xdReceiverPath = 'xd_receiverhtml'; function displayLoggedOut() { documentgetElementById('login')styledisplay = 'inline'; documentgetElementById('logout')styledisplay = 'none'; } function displayLoggedIn() { documentgetElementById('login')styledisplay = 'none'; documentgetElementById('logout')styledisplay = 'inline'; } function handleLogin() { displayLoggedIn(); } function handleLogout() { displayLoggedOut(); } FBinit('"FB_API_KEY"', 'xdreceiverhtml', {'ifUserConnected' : displayLoggedIn, 'ifUserNotConnected' : displayLoggedOut } ); FBensureInit( function() { }); </script>
Disconnecting Users from Facebook
If a user decides to disconnect his Facebook account from a Connected site, he can do it on the siteTo do this, the site must use the authrevokeAuthorization() Facebook application programming interface (API) call As discussed in 12, this API function is not available via the Facebook JavaScript Client Library, unless you pass your application s Secret key to FBinit()The easiest, and safest, way to handle this is to redirect users to a page where this call can be executed on the server Users can also disconnect their account via the Application Settings page on Facebook by removing your site from the Authorized group under External WebsitesWhen this happens, your site s Post Remove URL is pinged, which gives your site the capability to do any needed cleanup After a user s account is disconnected, the site cannot call any Facebook API functions on their behalf until the user chooses to reconnect his account
13 Facebook Connect
Reclaiming Accounts
If a user creates an account on your website using Facebook Connect and chooses to delete his Facebook account from Facebook, Connect allows your site to provide a URL for that user to access his account using site-specific credentials To enable this, fill out the Account Reclamation URL field in the Developer Settings for your Connect applicationWhen a user deletes his Facebook account, Facebook sends him an email with reclamation URLs for sites where he has enabled Facebook Connect Listing 138 shows an example of how to handle reclamationThe Account Reclamation URL receives two GET parameters: the Facebook user ID of the account and the user ID hashed with your Connect application s Secret keyThe PHP library provides a helper function called verify_account_reclamation() that compares an md5 hash of the user ID and the Application Secret to the received hash If they match, the call action is legitimate and your site needs to help the user enable a native login