server/www/login.js

function Login(domElem, lib) {
  domElem.addEventListener('submit', function(e) {
    e.preventDefault();
    lib.send({tag: "LogIn", name: domElem.name.value})
  });
  domElem.leave.addEventListener('click', function(e) {
    e.preventDefault();
    lib.send({tag: "LogOut"})
  });

  return {
    on: on,
    off: off
  };

  function on(name) {
    domElem.className = "on";
  }

  function off() {
    domElem.className = "";
  }
}