Masked input helper for simple_form

masked_input.coffee

// Requires http://digitalbush.com/projects/masked-input-plugin
element = $('[data-behaviour=masked-input]')
element.mask(element.data('mask'))

masked_input.rb

class MaskedInput < SimpleForm::Inputs::Base
  # Generates masked input with the desired mask
  #
  # Params:
  #
  #   mask  - mask that will be tranfered to the masked input java script library, decimal mask used by default
  #
  # Examples:
  #
  #   = f.input :multiplier, as: :masked, mask: '?9.3'
  #
  #   <input class="form-control" data-behaviour="masked-input" data-mask="?9.9"
  #          id="model_multiplier" name="model[multiplier]"
  #          step="any" type="string" value="1.0" data-components-host="true">
  #
  def input(wrapper_options)
    options = {
      class: 'form-control',
      type: :string,
      data: {
        behaviour: 'masked-input',
        mask: input_options[:mask] || '?9.9'
      }
    }
    options[:value] = input_options[:value] if input_options[:value].present?
    @builder.input_field(attribute_name, options)
  end
end

Requires Masked Input js library