ruby - Rails 4 form remote update div issue -

i'm having problems update div after submitting form rails 4. here relevant part of code:

view:

_details.html.haml

= form_tag(url_for(save_answer_path(format: :js)), remote: true)  (some html code ....)  = submit_tag t('app.bouton.send'), id: 'sendbutton'  %div#divlogs  = render partial: 'logs' 

controller:

def save_answer  code ...    respond_to |format|     format.js   end end 

js:

save_answer.js.erb

$('#divlogs').html("<%= escape_javascript(render partial: 'logs') %>"); 

when submit, called correctly i'am getting incorrect output. want update div, instead page have on js file, content of partial.

example:

my url after submitting:

http://domaine/controller/save_answer.js 

what on screen:

$('#divlogs').html("<p>this should appear on div </p>"); 

does know going on?

solution:

as @vladkhomich said in comments above, missing js file rails.js.

you can download here: https://github.com/rails/jquery-ujs/blob/master/src/rails.js