How about using rails_ujs and simply do the following:
Rails.fire(form, 'submit'); (where Rails.fire(form, 'submit'); is a DOM Element)
This feels like a proper Rails way to do it.
You can checcheck out the source here – https://github.com/rails/rails/blob/master/actionview/app/assets/javascripts/rails-ujs/utils/event.coffee#L34