Using native JavaScript objects from Opal

Question: can I call JS functions from Opal?
Answer: totally!

Opal standard lib (stdlib) includes a native module, let’s see how it works and wrap window:

require 'native'

window = Native(`window`) # equivalent to Native::Object.new(`window`)

Now what if we want to access one of its properties?

window[:location][:href]                         # => "http://dev.mikamai.com/"
window[:location][:href] = "http://mikamai.com/" # will bring you to mikamai.com

And what about methods?

window.alert('hey there!')

So let’s do something more interesting:

class << window
  # A cross-browser window close method (works in IE!)
  def close!
    %x{
      return (#@native.open('', '_self', '') && #@native.close()) ||
             (#@native.opener = null && #@native.close()) ||
             (#@native.opener = '' && #@native.close());
    }
  end

  # let's assign href directly
  def href= url
    self[:location][:href] = url
  end
end

That’s all for now, bye!

window.close!