Custom FormBuilder subclass to enable simple Ladda-enabled form buttons in Rails

form_elements_builder.rb

class FormElementsBuilder < ActionView::Helpers::FormBuilder

  # This is added to the normal form builder options, by adding 
  #   <%= form_for(resource, as: resource_name, url: registration_path(resource_name), builder: FormElementsBuilder) do |f| %>
  # then call it like this: <%= f.ladda_submit_button "Sign up" %>
  def ladda_submit_button(label, *args)
    options = args.extract_options!
    behaviour = options[:behaviour] || 'expand-left'
    @template.content_tag("button", {class: "ladda-button submit", 'data-style' => behaviour }) do
      @template.content_tag("span", label.to_s.humanize, class: 'ladda-label')
    end
  end

end