Want to display page content after password prompt without page reload

maybe this could help you.

Devise automatically redirects on sign in and sign up as long as you
store the location of the current page using devise’s
store_location_for(resource).

https://github.com/plataformatec/devise/wiki/How-To:-Redirect-back-to-current-page-after-sign-in,-sign-out,-sign-up,-update