ruby on rails - How to add overlay to Google map via ajax call -


working gmaps4rails , rails 3.2 , trying add overlay on top of google maps when user clicks checkbox "show radius" , circle show on map radius around user's location.

i know how create js callbacks tied google map created via gmaps4rails, how retrieve map dom within rails controller itself?

presumably, i'd call "showcircle" function within .js.erb template or similar.


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