FB.Connect: Callback function for only extends permission dialog?

I have to check if a user has permission to "publish_stream. I tried to run a new but I can not catch the actual login occurred.

If I use FB.Event.subscribe ('auth.login', function () { this is not activated and therefore the function is not performed.

In summary: User A is logged in but do not have permission to "publish_stream" - If I login again (with extended permissions) can not have your callback f开发者_开发问答unction!

• So how can I check if the user has actually allowed permits "publish_stream"?

i need to use Javascript SDK, not PHP

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This is actually a bit of a duplicate question, which was answered here, basically, you can make a call to the FB.Data database. To read up on how to use the FB.Data part of the SDK, it is available at Facebook here and here. Even though it doesn't discuss the permissions part of the database, it should provide some ideas. You may have to edit it a bit for the new oauth schema, but maybe not. I'll let you know. ;-)