Simple js partial example.

new.js.erb

$('#the-modal').html('<%=j render('form') %>')
$('#the-modal').modal('show')

new.js.opal

# This doesn't work

Element.expose :modal

the_modal = Element['#the-modal']
the_modal.html = j render('form') # this doesn't work... maybe it needs to be processed by erb too?
the_modal.modal 'show'

@kofno if you assign the rendered template to an instance variable you should be able to get it in the template, eg.:

# controller

def new
  @form_html = render(partial: 'form')
end

# template
Element.expose :modal

the_modal = Element['#the-modal']
the_modal.html = @form_html
the_modal.modal :show

You can't mix server side code like render into an opal template because it's executed in the client. In fact you can only pass json compatible values to instance variables (string, number etc. are ok, an object is not).

Thanks. I'll take a look at that.