Make webform unusable for non logged in users

I have a webform on my webpage, but i dont want to restrict the webform visibility to any users roles. What i want is to only make the webform unusable to any non logged in users by ether remove the send button or make it not clickable.

Is it any way to target the send button element with php and give it certain action for the visitors when logged in or logged out?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed