Question

My WP site allows users to send messages to other FB users with the FB.ui() send method:

          FB.ui(
              method: 'send',
              name: 'Bla Bla Bla',
              link: 'http://www.example.com',
              show_error: true,
              display: 'popup'
              },

              function (data) {
                console.log(data);
                if ( data.success=true ) {
                    console.log('SUCCESS');                 
                    jQuery.post('http://www.example.com/wp-admin/admin-ajax.php',               {
                            action : 'my_ajax_function',
                            user_id: '###',
                            postID : MyAjax.postID
                        }, function(returned) { console.log(returned);  }
                    );                  

                } else {
                    console.log('Failed to send FB invite');
                };
             }   
              );

As you can see, I’m making an AJAX call in the callback function. I’d really like that AJAX call to have access to the number of recipients who just received the message. When I log the data passed into the callback function, I don’t see any useful info besides success : true.

Anyone know of a way to retrieve the number of recipients?

Answer 1

When I log the data passed into the callback function, I don’t see any useful info besides success : true

And that’s only because you are setting the value of data.success yourself – data.success=true is not a comparison, it’s an assignment.

Anyone know of a way to retrieve the number of recipients?

There is no direct way of doing that, see https://developers.facebook.com/docs/reference/dialogs/send/:

“If sending the message is successful, the user will be redirected to the redirect_uri. Otherwise, an error will be shown. Unlike the Like Button, there is no return value per se.”

You could try to find the message that the user just send via the user/outbox connection after asking for read_mailbox permission – but you’d still have to figure out which message in there is the right one by looking at the created_time and/or message content.