ankane/chartkick — pull request #53 by khoan (2013-12-30 02:41:12+00:00)
Title: Expose chart objects

as per https://github.com/ankane/chartkick/issues/52

a quick test for:
google http://jsfiddle.net/khoan/SJNgE/
highcharts http://jsfiddle.net/khoan/66wkE/

I had to introduce a callback in order to access google chart object reliably.