app/views/signatures/_form.html.haml
= simple_form_for @signature do |f|
= render 'shared/error_messages', object: f.object
= f.input :name
= f.input :file, wrapper: :vertical_file_input, as: :file
= f.button :button, class: 'btn btn-submit col-xs-12' do
%span.glyphicon.glyphicon-refresh.spinner{ aria: { hidden: true } }
= submit_label