var connectionMessage = "internet connection";

var noConnectionMessage = "No internet connection.";

window.onload = checkInternetConnection;

function checkInternetConnection() {

  var isOnLine = navigator.onLine;

   if (isOnLine) {

      alert(connectionMessage);

   } else {

     alert(noConnectionMessage);

   }

}

document.body.addEventListener("offline", function () {

    //alert("offline")

    masterViewModel.online(false)

}, false);

document.body.addEventListener("online", function () {

    //alert("online")

    masterViewModel.online(true);

}, false);