Tutorial :Facebook iFrame application: How to pass data from URL Query String


I have a Facebook application that has a picture gallery. It's build in Flex 4. I want to allow users to link to a specific image.

How can that be done?

The only way I see this being done is adding a GET var like &my_picture=asd.jpg in the Facebook page URL, but I don't know how to read that from the iFrame.


Yes, you can add a parameter to the querystring for this:


Then, your app will be called like this:


Some other parameters are passed by facebook as well, most related to auth tokens, etc. They are prefixed by "fb_" to prevent name clashes.

In your index.php (or whatever you are using), read the get parameter you're interested in and pass them to your swf as usual.


What's great also about Facebook is that it carries EVERYTHING after your ../appname/{things-beyond-your-app-name} to you hosted [server] URL... so that even .htaccess can be used. ;)

Like this...


For an app that's hosted on my server at:


and by using this one-liner included in my hosted location's .htaccess file in:


where .htaccess file contains (among the other standard) lines...

I can put something like:

RewriteRule ^(.*)$ /myRedirectedPath/$1 [L,R=301]  

So if the person goes to: http://apps.facebook.com/YOURAPPNAME/a/b/c.htm (as in the above example)

They'll stay there and they'll be accessing:


(pretty sweet, eh?) ;)

Fun stuff... wanted you to know that there's more capability that just $_GET's.

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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