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As previously mentioned, test accounts cannot access the Facebook Developer application, so you cannot give test accounts access to sandboxed applications However, you can list them as developers of an application before you visit the test account conversion page After they are developers of the application, you can convert them, and they have full access to it, even in Sandbox mode
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Many of the modern browsers have extensions that allow client-side debugging of JavaScript, HTML and CSS, as well as monitoring and modifying network traffic Sadly, Internet Explorer 6 is still very common and has the fewest and least developed set of tools Firefox, Safari, and Internet Explorer 8 all have much better debugging support This section discusses Firebug in detail and gives some brief descriptions of the other common ones
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Firebug (http://getfirebugcom) is an add-on to Firefox that revolutionized the browserdevelopment experience For Facebook development, the key features are JavaScript debugging, inspection, and modification of HTML and CSS, network monitoring, and the console JavaScript Debugging The JavaScript debugger supports breakpoints, stepping in and out of code, a watch window, logging, and profiling For general usage, Firebug provides a set of tutorial videos and advanced documentation on its websiteThis section provides some tips for debugging JavaScript on Facebook Figure 45 shows the Firebug Script Debugger
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When trying to debug JavaScript on a Facebook FBML canvas page, it is important to understand what Facebook does to that JavaScript during rendering First, all variables and functions are renamed with a prefix of aXXX, where XXX is the application ID assigned when creating the application So, as Figure 45 shows,
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function foo(bar) { bar = bar + 1;
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return bar; }
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is rendered as follows:
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Facebook does this to all JavaScript that it encounters outside of IFramesThe process is called sandboxing, and it s a security measure First, it s used for namespacing: It ensures that none of the JavaScript provided by a third party running on a page in the Facebook user interface will have name conflicts with any of the JavaScript that Facebook uses Second, sandboxing allows Facebook to restrict third-party JavaScript to a well-defined subset of what is available to real JavaScript It removes many common functions (such as eval(), alert(), many DOM manipulation functions, and more)The resulting subset of JavaScript that developers can use is called Facebook JavaScript (FBJS) Facebook puts a copy of the original page source at the top of the page in a comment and the modified source at the bottomWhen trying to set breakpoints in your JavaScript functions, always make sure that you use the lower, modified source Firebug nicely marks the line numbers that can have breakpoints in green In a profile box or application tab, Facebook takes all of your functions, renames them, and sticks them inside JavaScript eval() calls passed to onLoadRegister():
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onloadRegister(function() {eval_global("app_9209742358pending_bootstrapspush (\"\\n function a9209742358_foo(a9209742358_bar) { \\n a9209742358_ bar = a9209742358_bar + 1; \\n return a9209742358_bar;\\n }\\n \");");});
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You can t set breakpoints on these lines Instead, Firebug has a great feature that turns executed eval() code into its own entire virtual script file So, execute your function once, and then you can select it from the script list, set breakpoints, and execute it again Notice the virtual script created by Firebug in Figure 46; it s the name above the Script tab
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HTML and CSS Inspection and Modification When building your application, getting it to look just right can be difficult, especially because parts of it are first being rendered by Facebook Firebug lets you view every DOM element and all the styles that have been applied to itYou can even modify the
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