php - When page is loading ajax not response -

i have progress bar, t work when page not loading, if page loading example inserting data database progressbar not, work when finish inserting data, wring code ?

<script>  $(document).ready(function() {   //       setinterval(function()           {      $.get("currentprogress.php", {        },          function(data)                 {       $('#progress_bar').width(data +"%");     $('#progress_completed').html(parseint(data) +"%");               }          )},1000);    });    </script>  

in php loop: $_session['value'] +=1;

and in currentprogress.php: <?php session_start(); echo $_session['value']; ?>