<!DOCTYPE html>
<html>
<head>
<title>title</title>
<script type="text/javascript">
function fn() { //function that sometimes takes a long time
show_loader();
var data;
for(var i = 0; i < 100000000; i++) {
data = i/2+3+4+5;
if(data > 1000) {
data = 1223;
}
if(data < 0) {
data = -1;
}
}
hide_loader();//if you remove this line the loader will show after the execution
}
function show_loader() {
document.getElementById('loader').style.visibility = "visible";
}
function hide_loader() {
document.getElementById('loader').style.visibility = "hidden";
}
</script>
</head>
<body>
<div id="container">
<div id="content">
<input type="button" value="Compress Code" id="compress_button" onclick="show_loader(); setTimeout(fn, 8000);" /><div id="loader" style="visibility:hidden;"><img src="https://dev-oregon-cvrp.pantheonsite.io/sites/default/files/oregon-loading.gif" width="300" height="300" /></div>
</div>
</div>
</body>
</html>
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