JavaScript Tutorial

.ajaxComplete()

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
    $(document).ready(function(){
      $(document).ajaxStart(function(){
        $("#wait").css("display", "block");
      });
      $(document).ajaxComplete(function(){
        $("#wait").css("display", "none");
      });
      $("button").click(function(){
        $("#txt").load("demo_ajax_load.asp");
      });
    });
</script>
</head>
<body>
<div id="txt"><h2>Let AJAX change this text</h2></div>
<button>Change Content</button>
<div id="wait" style="display:none;width:69px;height:89px;border:1px solid black;position:absolute;top:50%;left:50%;padding:2px;"><img src='demo_wait.gif' width="64" height="64" /><br>Loading..</div>
</body>
</html>