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FBJS is Facebook s version of JavaScript It supports most of the DOM-based manipulation methods that developers are comfortable with and the familiar events, functions, anonymous closures, and properties It differs from JavaScript in several important ways First, its syntax is slightly different, primarily to protect Facebook itself from malicious JavaScript code Next, many DOM properties used in normal JavaScript are replaced by get/set property methods Finally, some widely-used event handlers are not available that are widely used in normal client-side JavaScript For example, Facebook does not allow use of the ubiquitous onload() event handler to execute code when a web page loads In all but a few locations, a user must take a physical action on the page (set focus to a control, click a mouse button, hit a key) before FBJS can executeTo further protect itself, Facebook wraps all FBJS in what s called the sandboxTo accomplish this, Facebook prepends all FBJS variables, function names, and function parameters with a special string that ensures that no FBJS code conflicts with or can override any existing JavaScript code that might be on the page
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FQL stands for Facebook Query Language, and it should be familiar to anyone with basic SQL experience It offers a host of SQL-like features and language elements that allow applications to directly query Facebook s internal data tables Not all SQL s syntax is
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supported, but primitives, such as SELECT, WHERE, ORDER BY, and LIMIT, clauses are FQL is powerful in that it accesses and returns the same data provided by many of the Facebook API calls; however, it allows applications to have Facebook filter that data before it s returned to the client, which potentially speeds up page loading and response times Many times, applications need to call API methods whose input depends on the result of a previous API callA great example is demonstrated with getting the names of a user s friends Using the Facebook API, an application must first call the friendsget() method and then pass the result directly back into another API call, usersgetInfo()To get the same result in FQL requires one API call, which results in one less round trip to the Facebook servers FQL can also be preloaded for all the pages in an applicationThis is incredibly useful if an application needs similar Facebook data on every page
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XFBML and the Facebook JavaScript Client Library
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Applications based on IFrames and external sites that use Facebook Connect do not have access to FBML and, therefore, don t get access to a lot of the precanned Facebook controls and widgets it provides Facebook provided XFBML to address this problem, as well as the Facebook JavaScript Client Library to give developers access to more of the features provided by FBML Not all the FBML tags are supported, but many of the most popular ones are and, in most cases, behave exactly like their FBML counterpartsApplications that use XFBML must render their pages using strict XHTML and must load the Facebook JavaScript Client Library to get access to its features
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This chapter provided an overview of some of the ways in which Facebook Platform applications can integrate with Facebook, as well as some of the technologies available to make the process easier Here are the key points to remember:
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Facebook provides several points within its interface for applications to integrate Facebook profiles and Feed are the most important Developers can interact with the Facebook Platform internally via Facebook applications and pages, and externally via desktop applications and Facebook Connect Facebook provides several technologies that not only allow applications easy access to the data within the social graph, but also give applications the capability to easily match the look and feel of the Facebook user interface
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