The following code shows how to hover to show tooltip.
<!-- w w w . ja v a2 s . co m-->
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.8.3.js'></script>
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/css/bootstrap.min.css">
<script type='text/javascript'>
$(window).load(function(){
$(function(){
$("#plus").tooltip({
placement: 'bottom',
trigger: 'hover',
title : 'test'
});
$('#minus').tooltip({
placement: 'bottom',
trigger: 'hover',
title : 'test'
});
});
});
</script>
</head>
<body style='margin:30px'>
<button class="btn" type="button" id="plus">
<i class="icon-plus-sign"></i>
</button>
<button class="btn" type="button" id="minus">
<i class="icon-minus-sign"></i>
</button>
</body>
</html>