function computeTotalDistance(result) {
  var total = 0;
  var myroute = result.routes[0];
  for (i = 0; i < myroute.legs.length; i++) {
    total += myroute.legs[i].distance.value;
  }
  total = total / 1000.
  document.getElementById("total").innerHTML = total + " km";
}
       
var metric = myroute.legs[0].distance.text.indexOf(" km")!= -1?true:false;