Simple_form custom input for bootstrap-datepicker

simple_form_bootstrap_datepicker.rb

module SimpleForm
  module Inputs
    class DatePickerInput < SimpleForm::Inputs::StringInput
      def input_html_options
        value = object.send(attribute_name)
        options = {
          value: value.nil?? nil : I18n.localize(value, format: :datepicker),
          data: {
            behaviour: 'datepicker'
          }
        }
        # add all html option you need...
        super.merge options
      end

      def input_html_classes
        super.push('datepicker')
      end

      def input
        "#{super} #{template.content_tag(:span, template.glyph(:calendar), class: 'add-on')}".html_safe
      end
    end
  end
end