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Question

I\'m building a Facebook app and I have noticed that when attempting to get the login status of the user using their Javascript API, I sometimes get the error:

\"Ref

Answer 1

This is a problem when facebook redirects to your app from a web browser and then you redirect to the facebook authorization sign in. You have to make sure that the form replaces the page and does not load into the facebook canvas as it does not like it.

So you have to do a clean redirect like so -this is node example

res.send("<script> top.location.href='"+ "https://www.facebook.com/dialog/oauth?    
client_id=*********&redirect_uri=http://apps.facebook.com/myapp" + "'</script>");

Look at this facebook dev page and its in step 3

https://developers.facebook.com/docs/howtos/login/server-side-login/

Does not seem to be a problem with mobile apps just desktop

Answer 2

I had this problem too, fixed it with: The app was redirecting the user to a login screen from Facebook (auth dialog box), while the user was already logged in. So I changed the code to redirect either to the success page if logged in, or to the dialog box if not logged in.

Answer 3

Does this javascript work?

document.write(isFacebookPage()?"YES, I'm in a Facebook Page!":"No, not a Facebook Page");

function isFacebookPage(){
    return (document.location.href.indexOf('/pages/')>0);
}