UsageNotes/Javascript

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Javascript

Facebook has introduced a restricted, but functional version of JavaScript for use on Facebook. Only onClick attributes and the like are allowed directly in the html of an object; All other events must be registered as listeners. No JavaScript, including listeners, will be registered until the user clicks on a FBJS-enabled object. Facebook automatically rewrites variable and functions to appid_functionname, however they have created specific functions to access certain global functions that will not be rewritten.

Retrieved from "http://wiki.developers.facebook.com/index.php/UsageNotes/Javascript"
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