Pure JS way to handle mouse- and keyboard-inactivity from a user

inactivity.js

var inactivityTime = function () {
    var t;
    window.onload = resetTimer;
    // DOM Events
    document.onmousemove = resetTimer;
    document.onkeypress = resetTimer;

    function inactivityLogout() {
      // optional - turn off the event handlers
      // useful for single page apps
      window.onload = null;
      document.onmousemove = null;
      document.onkeypress = null;

      // Do something
    }

    function resetTimer() {
      clearTimeout(t);
      t = setTimeout(inactivityLogout, 15 * 60 * 1000) // 15 min
    }
};

inactivityTime();