(Rails) What is “RJS”?
This Railscast gives a nice example of using RJS to add and remove form fields dynamically without hitting the server with an ajax call. These RJS tips may also be helpful.
rjs
Javascript Include Tag Best Practice in a Rails Application
I would use content_for. For instance, specify the place to insert it in the application layout: <head> <title>Merry Christmas!</title> <%= yield(:head) -%> </head> And send it there from a view: <%- content_for(:head) do -%> <%= javascript_include_tag :defaults -%> <%- end -%>