<script>
$(document).ready(function() {
function updateDiv(){
$.ajax({
 url: "test.json",
 dataType: "json",
 cache: false,
 success: function(data) {
 $.each(data, function(index, element) {
 $("#messages").html(element.message);
 }));
 });
 }
 });
 }
 updateDiv();
 setInterval(updateDiv, 5000);
 });
 </script>