AJAX auto on views (without clicking submit button)
If you enable AJAX in Views, you can also edit "Exposed Form Style" settings. There is a checkbox in there that says "Autosubmit" which will react whenever a user changes an exposed filter.

Edit: sorry, that is for Drupal 7. I see you have listed Drupal 8. For Drupal 8, this was removed and is now being added in an effort in the CTools module. You can see the updates here: https://www.drupal.org/node/2475595

According to this comment, you can apply the latest patch in that thread to CTools 8.x beta1 release, enable "CTools Views" module to add the functionality back in.