= form_tag( enroll_students_extracurricular_activity_enrollments_path, method: "post", id: "enroll-to-extracurricular-activity-form", remote: true) do
  = hidden_field_tag "extracurricular_activity_id", @extracurricular_activity.id
  = hidden_field_tag "source", "extracurricular_activities"
  h4 = "Adding students to " + @extracurricular_activity.name
  = submit_tag t('extracurricular_activity.enroll'), class: 'btn btn-primary'