how to hide the progress bar when 100% is completed

progress bar code in source aspx page

function ShowProgress() {
setTimeout(function () {
var modal = $('

');
modal.addClass("modal");
$('body').append(modal);
var loading = $(".loading");
loading.show();
var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
loading.css({ top: top, left: left });
}, 200);

he progress bar working but have a final issue that needs to be resolved. How do I hide the progress bar when it has completed 100%

I have one button called export when i click the open button progress bar will shown and excel will be open and i close the excel file.

When i close the excel file in background progress bar is running.

for that how can i hide that background progress bar

please help me.