example.rb

class HelloWorld < React::Component::Base
  param :time, type: Time
  render do
    p do
      span { "Hello, " }
      input(type: :text, placeholder: "Your Name Here")
      span { "! It is #{params.time}"}
      button(type: :button) { "login!" }.on(:click) do
        login!
      end if valid_new_input?
    end
  end
end

every(1) do
  Element["#example"].render do
    HelloWorld(time: Time.now)
  end
end