using view helpers in JavaScript templates

I'd like to use ERB in my JS templates. Sometimes I want <%= image_tag %>, other times I might want something more serious/non-assety like < %= form_for %>. (There was an issue for Sprockets to allow for ActionView to be used in the asset pipeline so that that could work:, but it turns out it's not so simple.)

I guess there are a few ways that I could do this, so I'm looking for a best practice. How do you handle view helpers, like form_for? Do you render your template within the view, or do you just use old school pure html, or are there any bridge approaches?

Right now we're trying out codebrew's backbone-rails gem, but we definitely need to find a migration path for the extensive system of view helpers both in Rails and in our own project that we'd like to reference.