Question

I’ve got a Rails app that’s running in an iframe in a canvas app for a page.

What I need to do is get the current page ID to pass to the iframe.

Basically trying to have the iframe show X based on what page the app is setup on.

Answer 1

As described in Page Tab Tutorial:

When a user selects your Page Tab, you will receive the signed_request parameter with one additional parameter, page. This parameter contains a JSON object with an id (the page id of the current page), admin (if the user is a admin of the page), and liked (if the user has liked the page). As with a Canvas Page, you will not receive all the user information accessible to your app in the signed_request until the user authorizes your app.