Improve accessibility with [aria-required] in SimpleForm

SimpleForm comes with an option browser_validations which could be used to give fields that have a presence validation the HTML required Show archive.org snapshot attribute. We usually turn it off due to difficulties controlling its behavior and appearance. Instead we only mark required fields with an asterisk (*) next to its label. Blind users probably only discover the validation issue after submitting the form due to the now displayed error messages.

A compromise with better accessibility is to add the aria-required Show archive.org snapshot attribute in this case. This allows screen readers to announce fields as required before the form is submitted.

1. Define a SimpleForm component:

Copymodule SimpleForm
  module Components
    module AriaRequired
      def aria_required(_wrapper_options)
        if required_field?
          input_html_options['aria-required'] = 'true'
        end
        nil
      end
    end
  end
end

SimpleForm::Inputs::Base.include(SimpleForm::Components::AriaRequired)

2. Change all your wrappers to use it:

CopySimpleForm.setup do |config|
  config.browser_validations = false
  
  config.wrappers :default, error_class: :field_with_errors do |b|
    b.use :aria_required
  end
end