<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script>
(function($, undefined){
  $(function(){
  var timer = setTimeout(function(){
    $.ajax("timer.txt")
     .fail(function(jqxhr, status, error){  $("#warning").html("Error:" + status + " : " + error); })
     .done(function(data){ $("#warning").html(data); })
    }, 2000);
  });
})(JQuery)
</script>