A simple typeahead input tag

list_tag.rb

module ApplicationHelper

  def list_tag(name, *args)
    options = args.extract_options!.merge(name: name, list: name)
    input_tag = tag :input, options
    datalist_tag = content_tag :datalist, nil, id: name do
      args[0].collect do |value|
        tag :option, value: value
      end.join.html_safe
    end
    return input_tag + datalist_tag
  end

end

# Usage:
# <%= list_tag :actor, Actor.pluck(:name) %>