The following code shows how to show alert block with fade in.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.10.1.js'></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0-wip/css/bootstrap.min.css">
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0-wip/js/bootstrap.min.js"></script>
<script type='text/javascript'>
$(window).load(function(){<!-- w w w.ja v a2 s.co m-->
$("#click").click(function() {
$("#success").html('Hello World!').removeClass("hide").hide().fadeIn("slow");
});
});
</script>
</head>
<body>
<div id="success" class="alert alert-success hide"></div>
<br>
<button type="submit" id="click">Click</button>
</body>
</html>