          $this = $(this)
                    // if someone entered/pasted a full URL, we strip evertyhing until last '/'
                    setTimeout(function (elem) {
                        $this.val($this.val().substring($this.val().lastIndexOf("/") + 1));
                    }, 100);
                });

                <!-- TODO not working with django tagulous which uses select2, break styling -->
                <!-- $('#id_tags').select2({ -->
                    <!-- 'placeholder': 'Select or ad