Rails bindings for Opal Ruby engine. (Changelog)
In your Gemfile
gem 'opal-rails'
or when you build your new Rails app:
rails new <app-name> --javascript=opal
Add your configuration in config/application.rb
with the following contents:
module MyApp
class Application < Rails::Application
# These are the available options with their default values
# Compiler options
config.opal.method_missing = true
config.opal.optimized_operators = true
config.opal.arity_check = false
config.opal.const_missing = true
config.opal.dynamic_require_severity = :ignore
# Enable/disable /opal_specs route
config.opal.enable_specs = true
# The path to opal specs from Rails.root
config.opal.spec_location = 'spec-opal'
end
end
You can rename app/assets/javascripts/application.js
to application.js.rb
. Even if not necessary, it is recommended to change Sprockets' //= require
statements to Ruby' require
methods.
Sprockets' //= require
statements won't be known by the opal builder and therefore you can end up adding something twice.
For Opal 0.8 and above, you have to use application.js.rb
with the following syntax:
# app/assets/javascripts/application.js.rb
require 'opal'
require 'opal_ujs'
require 'turbolinks'
require_tree '.'
If you want to use application.js
, you need to load
the Opal modules(files) manually, e.g.:
// application.js
//= require opal
//= require greeter
//= require_self
Opal.load('greeter');
As you see in the example above, Opal also gives you a Ruby equivalent of //= require_tree
.
Opal requires are forwarded to the Asset Pipeline at compile time (similarly to what happens for RubyMotion). You can use either the .rb
or .opal
extension:
# app/assets/javascripts/greeter.js.rb
puts "G'day world!" # check the console!
# Dom manipulation
require 'opal-jquery'
Document.ready? do
Element.find('body > header').html = '<h1>Hi there!</h1>'
end
You can use it for your views too, it even inherits instance and local variables from actions:
# app/controllers/posts_controller.rb
def create
@post = Post.create!(params[:post])
render type: :js, locals: {comments_html: render_to_string(@post.comments)}
end
Each assign is filtered through JSON so it's reduced to basic types:
# app/views/posts/create.js.opal
post = Element.find('.post')
post.find('.title').html = @post[:title]
post.find('.body').html = @post[:body]
post.find('.comments').html = comments_html
Of course you need to require haml-rails
separately since its presence is not assumed
-# app/views/posts/show.html.haml
%article.post
%h1.title= post.title
.body= post.body
%a#show-comments Display Comments!
.comments(style="display:none;")
- post.comments.each do |comment|
.comment= comment.body
:opal
Document.ready? do
Element.find('#show-comments').on :click do |click|
click.prevent_default
click.current_target.hide
Element.find('.comments').effect(:fade_in)
end
end
Extracted to opal-rspec-rails
Add this line to your Gemfile
gem 'opal-rspec-rails', github: 'opal/opal-rspec-rails'
Upcoming as opal-minitest-rails
As long as the templates are inside the sprockets/opal load path, then you should be able to just require them.
Let's say we have this template app/views/shared/test.haml
:
.row
.col-sm-12
= @bar
We need to make sure Opal can see and compile that template. So we need to add the path to sprockets:
# config/initializers/opal.rb
Rails.application.config.assets.paths << Rails.root.join('app', 'views', 'shared').to_s
Now, somewhere in application.rb
you need to require that template, and you can just run it through Template
:
# app/assets/javascripts/application.rb
require 'opal'
require 'opal-haml'
require 'test'
@bar = "hello world"
template = Template['test']
template.render(self)
# => '<div class="row"><div class="col-sm-12">hello world</div></div>'
Just use Opal.use_gem
in your asset initializer (in config/initializers
).
Example:
Opal.use_gem 'cannonbol'
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