Using a Rails helper method within a javascript asset

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You can include any helper/module/class in an erb template with:

<% environment.context_class.instance_eval { include MyHelper } %>

See: https://github.com/rails/sprockets/blob/master/lib/sprockets/environment.rb and https://github.com/rails/sprockets/blob/master/lib/sprockets/context.rb

To use the url helpers you have to include your specific applications’ helpers.

They are available at Rails.application.routes.url_helpers so: 

<% environment.context_class.instance_eval { include Rails.application.routes.url_helpers } %>

EDIT: Fixed links to moved sprockets repo but not really sure this still makes sense so many years later.

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