Virtual Dom support for Opal

requiments

This wrapper require to load virtual-dom first. For example you can use rails assets.

source 'https://rails-assets.org' do
  gem 'rails-assets-virtual-dom'
end

usage

Server side (config.ru, Rakefile, Rails, Sinatra, etc.)

require 'opal-virtual-dom'

Browser side

require 'opal'
require 'virtual-dom' # javascript library
require 'browser'     # not required
require 'virtual_dom' # opal wrapper

class SampleList
  include VirtualDOM

  def initialize(elements = [])
    @elements = elements
  end

  def render
    ul class: 'simple-list' do
      @elements.each do |string|
        li do
          text string
        end
      end
    end
  end
end

$document.ready do
  list = SampleList.new(%w(one two three)).render
  back = SampleList.new(%w(three two one)).render

  root_node = VirtualDOM.create(list)
  $document.body.inner_dom = root_node

  diff = VirtualDOM.diff(list, back)
  VirtualDOM.patch(root_node, diff)
end