Dialog:permissions.request

If you need to get extended permissions from a logged in user without having to redirect them back to the login URL, this is the way to do it.

Property	Type	Description	Argument	Possible Values / Examples
method	String	The UI dialog to invoke.	Required	'permissions.request'
perms	comma deliminated string	list of permissions to be requested	Required?	Ex. 'user_birthday,user_relationship_details,read_stream' see Extended Permissions for list of possible values

Example permissions.request using JavaScript SDK dialog:

FB.ui({
   method: 'permissions.request',
   'perms': 'user_birthday,user_relationship_details,read_stream',
   'display': 'iframe'
  },
  function(response) {
    // check response.perms that it has all the required permissions...  if so, continue to next page.
    // TODO should be a better way to do this since UI checks perms

    if (response.perms != null && isSetProperSubset(permissions.split(","), response.perms.split(","))) {
      top.location.href = "http://apps.facebook.com/fbdevwiki/"+nextUrl;
    }
  }
);

function isSetProperSubset(subset, superset) {
  // first check lengths
  if (subset.length > superset.length) {
    return false;
  }

  var lookup = {};

  for (var j in superset) {
    lookup[superset[j]] = superset[j];
  }

  for (var i in subset) {
    if (typeof lookup[subset[i]] == 'undefined') {
      return false;
    } 
  }
  return true;
}