This was my attempt to get a working prototype up and running (designed for a desktop device). You can find an example here.
Team names are stored to localstorage but the other stats created are lost once the browser is closed. I've determined that it's too difficult for one person to record all the stats of a game, so I'm going to rebuild the application to allow multiple clients to simultaneously update different aspects of the same game.
I plan to use socket.io and a Node.js server to allow client devices to add stats during the game and asynchronously update any other clients observing the game (e.g. Assistant Coach mode).
A large portion of this code needs to be refactored but I'm leaving it the way it is now to focus on building out the server and backend architecture.