Select2 Events

gistfile1.js

 $('#add_to_list').on('change', function($e) {
                            if ($e.added !== undefined) {
                                $.ajax({
                                    url: '/api/add_to_list.json',
                                    data: {list_id: $e.added.id, movie_id: $id, user_id: $user_id},
                                    success: function() {
                                        add_notify($movie_title, $e.added.text, $poster);
                                    }
                                });
                            }

                            if ($e.removed !== undefined) {
                                $.ajax({
                                    url: '/api/remove_from_list.json',
                                    data: {list_id: $e.removed.id, movie_id: $id},
                                    success: function() {
                                        remove_notify($movie_title, $e.removed.text, $poster);
                                    }
                                });
                            }
                        });