Bootstrap Loading State Button Using jQuery

<html>
<head>
<title>Bootstrap Form Field Validation</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("button").click(function() {   
    $(this).html(' Loading...');
});
});
</script>
</head>
<body>
<h1 class='heading-center'>Button Loading State</h1>
<button type="button" class="btn btn-primary">Primary Button</button>
</body>
</html>