Ruby on Rails
Integracja React.js z Railsami przy użyciu Hyperloop

Wprowadzenie

Uwagi

Dodanie prostego komponentu reagującego (napisanego w rubinie) do aplikacji Rails

1. Dodaj klejnot hyperloop do swoich szyn (4.0 - 5.1) Gemfile
2. bundle install
3. Dodaj manifest hyperloop do pliku application.js:

   // app/assets/javascripts/application.js
   ...
   //= hyperloop-loader
   

4. Utwórz komponenty reagujące i umieść je w katalogu hyperloop/components

   # app/hyperloop/components/hello_world.rb
   class HelloWorld < Hyperloop::Component
     after_mount do
       every(1.second) { mutate.current_time(Time.now) }
     end
     render do
       "Hello World!  The time is now: #{state.current_time}"
     end
   end
   

5. Komponenty zachowują się jak widoki. Są „montowane” za pomocą metody render_component w kontrolerze:

   # somewhere in a controller:
     ...
     def hello_world
       render_component # renders HelloWorld based on method name
     end
   

Deklarowanie parametrów komponentu (rekwizyty)

class Hello < Hyperloop::Component
  # params (= react props) are declared using the param macro
  param :guest
  render do
    "Hello there #{params.guest}"
  end
end

# to "mount" Hello with guest = "Matz" say 
  Hello(guest: 'Matz')

# params can be given a default value:
  param guest: 'friend' # or
  param :guest, default: 'friend'

Tagi HTML

# HTML tags are built in and are UPCASE
class HTMLExample < Hyperloop::Component
  render do
    DIV do
      SPAN { "Hello There" }
      SPAN { "Welcome to the Machine!" }
    end
  end
end

Obsługa zdarzeń

# Event handlers are attached using the 'on' method
class ClickMe < Hyperloop::Component
  render do
    DIV do
      SPAN { "Hello There" }
      A { "Click Me" }.on(:click) { alert('you did it!' }
    end
  end
end

Stany

# States are read using the 'state' method, and updated using 'mutate'
# when states change they cause re-render of all dependent dom elements

class StateExample < Hyperloop::Component
  state count: 0  # by default states are initialized to nil
  render do
    DIV do
      SPAN { "Hello There" }
      A { "Click Me" }.on(:click) { mutate.count(state.count + 1) }
      DIV do 
        "You have clicked me #{state.count} #{'time'.pluralize(state.count)}"
      end unless state.count == 0
    end
  end
end

Zauważ, że stany mogą być współużytkowane przez komponenty za pomocą Hyperloop :: Sklepy

Callbacki

# all react callbacks are supported using active-record-like syntax

class SomeCallBacks < Hyperloop::Component
  before_mount do
    # initialize stuff - replaces normal class initialize method
  end
  after_mount do
    # any access to actual generated dom node, or window behaviors goes here
  end
  before_unmount do
    # any cleanups (i.e. cancel intervals etc)
  end
  
  # you can also specify a method the usual way:
  before_mount :do_some_more_initialization
end