JavaScript Tutorial/jQuery/length
Count the divs. Click to add more.
<html>
<head>
<script type="text/javascript" src="js/jquery-1.3.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(document.body).click(function () {
$(document.body).append($("<div>asdf</div>"));
var n = $("div").length;
$("span").text("There are " + n + " divs." + "Click to add more.");
}).trigger("click");
});
</script>
</head>
<body>
<body>
<span>asdf</span>
<div>asdf</div>
</body>
</html>