checking-if-the-user-are-online.js

  window.addEventListener('load', function(e) {
    if (navigator.onLine) {
      console.log('We\'re online!');
    } else {
      console.log('We\'re offline...');
    }
  }, false);

  window.addEventListener('online', function(e) {
    console.log('And we\'re back :).');
  }, false);

  window.addEventListener('offline', function(e) {
    console.log('Connection is down.');
  }, false);