Dynamic multi-youtube video page

Idea of the project: Have a single webpage that can load multiple youtube video's and autoplay them as soon as someone enters the ID in a certain inputbox. This page should be dynamic, i.e; when user A edits the fields and clicks a button to 'load them', the page should save / load over these values even for other users who also have this page open. Semi working idea, but it doesn't synchronize w/ other sessions having the page open: [login to view URL] (i am no coder)