I know this has been asked a bunch of times, but I have only seen serverside solutions.
I'm running an iframe app that is embedded into a page as a tab. I want be test to see if the page is liked or not without prompting the user for anything.
Is there a way to do this with just JavaScript? The platoform we are building on is ASPX and I dont really have the option of going serverside.
Its not available because you need to inspect the http post parameter called signed_request and this isn't available on the client side. If the user has authenticated with your app and given you permissions to read their likes/interests, then you could then check with javascript api but I'm guessing you wouldn't want to make them approve your app just for this.