handle ASYNC calls to API and subsequent Angular Digest cycle

digest_helper.rb

def page_ready
  if (execute_script("return document.readyState") != 'complete') || (execute_script("return window.jQuery.active") != 0)
    return false # Not Ready: Document not loaded or active jQuery on page
  end
  phase = execute_script("return window.angular.element(document.body).injector().get('$rootScope').$$phase")
  pending = execute_script("return window.angular.element(document.body).injector().get('$http').pendingRequests.length")
  if (phase === '$apply' || phase === '$digest' || pending != 0)
    return false # Not Ready: Angular digesting or loading data
  end
  return true # Ready
rescue 
  false
end

def digest_helper(seconds=30)
  timeout = seconds
  end_time = Time.now + timeout
  until Time.now > end_time
    result = page_ready
    return result if result # ASYNC and Digest finished
  end
  raise(StandardError, "Digest Helper: Page was not ready after #{timeout} seconds") # ASYNC and Digest took longer than time allowed
end