Rails render not refrshing the page

Rails render not refrshing the page

I am working on ROR app . The app view contain ajax and jquery code :
jQuery.ajax({
data: 'val=' + val,
dataType: 'script',
type: 'post',
url: "/portfolio/update"
});
The update action contain this code:
def update
j=params[:val]
# Buisness logic code
redirect_to root_url,notice:"update done"
end
current View and Root url is same - Portfolio/show Now the button on view
(which is root_url only)is doing the business logic fine , but the page is
not getting refreshed , Whereas other simple form button on views are
doing it. After pressing button i am getting this in rails server :
Rendered portfolio/show.erb (1.5ms) Completed 200 OK in 24ms (Views:
4.1ms)

Any guesses, but the page is not refreshing by its own.