SimpleForm Initializer for Foundation 6 with additional markup to allow styling of checkboxes, radio buttons and file controls

control_indicator_helper.rb

# lib/components/control_indicator_helper.rb

module ControlIndicatorComponent
  def select_arrow(wrapper_options=nil)
    @arrow_icon ||= begin
      if options[:arrow_icon].nil? || options[:arrow_icon].to_s == 'default'
        ''
      else
        options[:arrow_icon].to_s.html_safe
      end
    end
  end

  def checkbox_radio_indicator(wrapper_options=nil)
    @check_icon ||= begin
      if options[:check_icon].nil? || options[:check_icon].to_s == 'default'
        ''
      else
        options[:check_icon].to_s.html_safe
      end
    end
  end

  # https://github.com/plataformatec/simple_form/blob/master/lib/simple_form/inputs/collection_radio_buttons_input.rb#L4
  def checkbox_radio_collection(wrapper_options=nil)
    label_method, value_method = detect_collection_methods
    merged_input_options       = merge_wrapper_options(input_html_options, wrapper_options)

    input_options.merge!(
      item_wrapper_tag: nil,
      item_label_class: SimpleFormConfig.config.control_class,
      boolean_style:    :nested
    )

    template.capture do
      template.concat template.content_tag(:legend, label_text)
      template.concat template.content_tag(:div, @builder.send(:"collection_#{input_type}",
                        attribute_name,
                        collection,
                        value_method,
                        label_method,
                        input_options,
                        merged_input_options,
                        &ovrd_collection_block_for_nested_boolean_style
                      ), class: SimpleFormConfig.config.control_group_class)
    end
  end

  private

    def ovrd_collection_block_for_nested_boolean_style
      proc { |builder| ovrd_build_nested_boolean_style_item_tag(builder) }
    end

    def ovrd_build_nested_boolean_style_item_tag(collection_builder)
      template.capture do
        template.concat collection_builder.send(:"#{input_type.to_s.singularize}")
        template.concat template.content_tag(:span, select_arrow, class: SimpleFormConfig.config.indicator_class)
        template.concat template.content_tag(:span, collection_builder.text, class: SimpleFormConfig.config.label_class)
      end
    end

end

SimpleForm.include_component(ControlIndicatorComponent)

simple_form.rb

# config/initializers/simple_form.rb
# frozen_string_literal: true

# See https://github.com/plataformatec/simple_form#custom-components
Dir[Rails.root.join('lib/components/**/*.rb')].each { |f| require f }

module SimpleFormConfig
  include ActiveSupport::Configurable
  class << self
    def configure
      yield config
    end
  end
end

SimpleFormConfig.configure do |config|
  config.button_class              = 'button'
  config.default_form_class        = 'form'
  config.default_input_class       = 'form-input'
  config.label_class               = 'form-control__label'
  config.indicator_class           = 'form-control__indicator'
  config.collection_wrapper_class  = 'form-control__collection'
  config.error_notification_class  = 'form__error-notification'
  config.control_class             = 'form-control'
  config.select_control_class      = 'form-control-select'
  config.control_group_class       = 'form-control-group'
  config.control_group_label_class = 'form-control-group__label'
  config.control_error_class       = 'form-control__error'
  config.control_hint_class        = 'form-control__hint'
  config.input_field_valid_class   = 'is-valid'
  config.input_field_error_class   = 'is-invalid'
  config.wrapper_hint_class        = 'has-hint'
  config.wrapper_error_class       = 'has-error'
end

SimpleForm.setup do |config|

  config.button_class             = SimpleFormConfig.config.button_class
  config.default_form_class       = SimpleFormConfig.config.default_form_class
  config.label_class              = SimpleFormConfig.config.label_class
  config.collection_wrapper_class = SimpleFormConfig.config.collection_wrapper_class
  config.error_notification_class = SimpleFormConfig.config.error_notification_class
  config.input_field_valid_class  = SimpleFormConfig.config.input_field_valid_class
  config.input_field_error_class  = SimpleFormConfig.config.input_field_error_class

  default_wrapper_options = {
    hint_class:  SimpleFormConfig.config.wrapper_hint_class,
    error_class: SimpleFormConfig.config.wrapper_error_class,
    class:       SimpleFormConfig.config.default_input_class
  }

  default_label_wrapper_options = {
    tag: 'label', class: SimpleFormConfig.config.control_class
  }

  default_hint_options = {
    tag: 'p', class: SimpleFormConfig.config.control_hint_class
  }

  default_error_options = {
    tag: 'p', class: SimpleFormConfig.config.control_error_class
  }

  default_label_options = {
    tag: 'span', class: config.label_class
  }

  default_indicator_options = {
    tag: 'span',  class: SimpleFormConfig.config.indicator_class
  }

  # ==== Default

  config.wrappers :default, default_wrapper_options do |b|
    # Extensions
    b.use      :html5
    b.use      :placeholder
    b.optional :maxlength
    b.optional :min_max
    b.optional :minlength
    b.optional :pattern
    b.optional :readonly

    # Components
    b.use :label_input
    b.use :hint,       wrap_with: default_hint_options
    b.use :full_error, wrap_with: default_error_options
  end

  # ==== Text Input

  config.wrappers :f6_text, default_wrapper_options do |b|
    b.use      :html5
    b.use      :placeholder
    b.optional :maxlength
    b.optional :min_max
    b.optional :minlength
    b.optional :pattern
    b.optional :readonly
    b.wrapper default_label_wrapper_options do |bb|
      bb.use :label_text, wrap_with: default_label_options
      bb.use :input
    end
    b.use :hint,       wrap_with: default_hint_options
    b.use :full_error, wrap_with: default_error_options
  end

  # ==== Select Input

  config.wrappers :f6_select, default_wrapper_options do |b|
    b.use      :html5
    b.optional :readonly
    b.wrapper default_label_wrapper_options do |bb|
      bb.use :label_text, wrap_with: default_label_options
      bb.wrapper tag: :div, class: SimpleFormConfig.config.select_control_class  do |bbb|
        bbb.use :input
        bbb.use :select_arrow, wrap_with: default_indicator_options
      end
    end
    b.use :hint,       wrap_with: default_hint_options
    b.use :full_error, wrap_with: default_error_options
  end

  # ==== Boolean Input

  config.wrappers :f6_boolean, default_wrapper_options do |b|
    b.use      :html5
    b.optional :readonly
    b.wrapper default_label_wrapper_options do |bb|
      bb.use :input, boolean_style: :inline
      bb.use :checkbox_radio_indicator, wrap_with: default_indicator_options
      bb.use :label_text,               wrap_with: default_label_options
    end
    b.use :hint,       wrap_with: default_hint_options
    b.use :full_error, wrap_with: default_error_options
  end

  # ==== Checkbox Collection

  config.wrappers :f6_check_boxes, default_wrapper_options do |b|
    b.use      :html5
    b.optional :readonly
    b.wrapper tag: :fieldset, class: config.collection_wrapper_class do |bb|
      bb.use :checkbox_radio_collection
    end
    b.use :hint,       wrap_with: default_hint_options
    b.use :full_error, wrap_with: default_error_options
  end

  # ==== Radio Button Collection

  config.wrappers :f6_radio_buttons, default_wrapper_options do |b|
    b.use      :html5
    b.optional :readonly
    b.wrapper tag: :fieldset, class: config.collection_wrapper_class do |bb|
      bb.use :checkbox_radio_collection
    end
    b.use :hint,       wrap_with: default_hint_options
    b.use :full_error, wrap_with: default_error_options
  end

  config.default_wrapper = :f6_text

  # Define the way to render check boxes / radio buttons with labels.
  # Defaults to :nested for bootstrap config.
  #   inline: input + label
  #   nested: label > input
  config.boolean_style = :inline

  # Method used to tidy up errors. Specify any Rails Array method.
  # :first lists the first message for each field.
  # Use :to_sentence to list all errors for each field.
  config.error_method             = :first
  config.error_notification_tag   = :div
  config.collection_label_methods = [ :to_label, :name, :title, :to_s ]
  config.collection_value_methods = [ :id, :to_s ]

  # You can wrap a collection of radio/check boxes in a pre-defined tag, defaulting to none.
  # config.collection_wrapper_tag = nil

  # You can wrap each item in a collection of radio/check boxes with a tag,
  # defaulting to :span.
  # config.item_wrapper_tag = :span

  # You can define a class to use in all item wrappers. Defaulting to none.
  config.item_wrapper_class = '123'

  # How the label text should be generated altogether with the required text.
  config.label_text = lambda { |label, required, explicit_label| "#{label} #{required}" }

  # You can define which elements should obtain additional classes
  # config.generate_additional_classes_for = [:wrapper, :label, :input]

  # Whether attributes are required by default (or not). Default is true.
  config.required_by_default = false

  # Tell browsers whether to use the native HTML5 validations (novalidate form option).
  # These validations are enabled in SimpleForm's internal config but disabled by default
  # in this configuration, which is recommended due to some quirks from different browsers.
  # To stop SimpleForm from generating the novalidate option, enabling the HTML5 validations,
  # change this configuration to true.
  config.browser_validations = false

  # Collection of methods to detect if a file type was given.
  config.file_methods = [ :mounted_as, :file?, :public_filename, :attached? ]

  # Custom mappings for input types. This should be a hash containing a regexp
  # to match as key, and the input type that will be used when the field name
  # matches the regexp as value.
  # config.input_mappings = { /count/ => :integer }

  # Custom wrappers for input types. This should be a hash containing an input
  # type as key and the wrapper that will be used for all inputs with specified type.
  config.wrapper_mappings = {
    string:        :f6_text,
    text:          :f6_text,
    select:        :f6_select,
    boolean:       :f6_boolean,
    check_boxes:   :f6_check_boxes,
    radio_buttons: :f6_radio_buttons
  }

  # Namespaces where SimpleForm should look for custom input classes that
  # override default inputs.
  # config.custom_inputs_namespaces << "CustomInputs"

  # Default priority for time_zone inputs.
  # config.time_zone_priority = nil

  # Default priority for country inputs.
  # config.country_priority = nil

  # When false, do not use translations for labels.
  # config.translate_labels = true

  # Automatically discover new inputs in Rails' autoload path.
  # config.inputs_discovery = true

  # Cache SimpleForm inputs discovery
  # config.cache_discovery = !Rails.env.development?

  # Default class for inputs
  config.input_class = nil

  # Define the default class of the input wrapper of the boolean input.
  config.boolean_label_class = nil

  # Defines if the default input wrapper class should be included in radio
  # collection wrappers.
  # config.include_default_input_wrapper_class = true

  config.i18n_scope = 'simple_form'
end

styleguide.html.slim

ruby:
  collection_options = ['Options 1', 'Options 2', 'Options 3', 'Options 4']

= simple_form_for :styleguide do |f|
  fieldset.form__inputs
    legend String
    .grid-x.grid-margin-x
      .cell.auto = f.input :string
      .cell.auto = f.input :disabled_string, disabled: true
  fieldset.form__inputs
    legend Text
    .grid-x.grid-margin-x
      .cell.auto = f.input :text, as: :text
      .cell.auto = f.input :disabled_text, as: :text, disabled: true
  fieldset.form__inputs
    legend Select
    .grid-x.grid-margin-x
      .cell.auto = f.input :select, as: :select, collection: collection_options
      .cell.auto = f.input :disabled_select, as: :select, collection: collection_options, disabled: true
  fieldset.form__inputs
    legend File
    .grid-x.grid-margin-x
      .cell.auto = f.input :file, as: :file
      .cell.auto = f.input :disabled_file, as: :file, disabled: true
  fieldset.form__inputs
    legend Boolean
    .grid-x.grid-margin-x
      .cell.auto = f.input :boolean, as: :boolean, label: 'Boolean label'
      .cell.auto = f.input :disabled_boolean, as: :boolean, disabled: true
  fieldset.form__inputs
    legend Checkbox Collection
    .grid-x.grid-margin-x
      .cell.auto = f.input :check_boxes, as: :check_boxes, collection: collection_options
      .cell.auto = f.input :disabled_check_boxes, as: :check_boxes, collection: collection_options, disabled: true
  fieldset.form__inputs
    legend Radio Button Collection
    .grid-x.grid-margin-x
      .cell.auto = f.input :basic_radio_buttons, as: :radio_buttons, collection: collection_options
      .cell.auto = f.input :disabled_radio_buttons, as: :radio_buttons, collection: collection_options, disabled: true
  fieldset.form__actions
    = button_tag 'Submit', class: 'button'