gistfile1.rb

<% if flash[:error].present? %>
  <h3><%= flash[:error] %></h3>
<% else %>
<div id="fb-root"></div>
<div id="error-message"></div>
<script type="text/javascript" src="http://connect.facebook.net/en_US/all.js"></script>
<script type="text/javascript">
  window.fbAsyncInit = function() {
    FB.init({
	    appId : "<%= Facebook::CONFIG['app_id'] %>",
      status : true, // check login status
      cookie : true, // enable cookies to allow the server to access the session
      xfbml  : true  // parse XFBML
    });
    var cb = function(response) {
      if (response.session) {
        // user successfully logged in
        load_pages(response.session.uid);
      } else {
        // user isn't logged in for some reason, prompt again.
        FB.login(cb);
        //document.getElementById("error-message").innerHTML = "Unable to connect to Facebook.";
      }
    };
    
    (function() {
      FB.getLoginStatus(cb);
    }());
  };
  
  function load_pages(fb_user_id) {
    FB.api(
      {
        method: "fql.multiquery",
        queries: {
          "query1" : "SELECT page_id FROM page_admin WHERE uid=" + fb_user_id,
          "result" : "SELECT page_id, name FROM page WHERE page_id IN (SELECT page_id FROM #query1)"
          }
      },
      function(response) {
        // TODO what if user doesn't have any pages?
        var results = response[response.length-1].fql_result_set; // [{name, page_id}, ...]
        if(window.opener.addChannelsForm != null)
          window.opener.addChannelsForm.loadChannels(results, {medium: 'facebook', success: false});
        window.close();
      }
    );
  }
</script>
<% end %>