focus selector
Description: Selects element if it is currently focused.
jQuery(':focus')
version added: 1.6
As with other pseudo-class selectors (those that begin with a ":"), it is recommended to precede :focus with a tag name or some other selector; otherwise, the universal selector ("*") is implied. In other words, the bare $(':focus') is equivalent to $('*:focus'). If you are looking for the currently focused element, $( document.activeElement ) will retrieve it without having to search the whole DOM tree.
Example
Adds the focused class to whatever element has focus<!DOCTYPE html>
<html>
<head>
<style>
.focused {
background: #abcdef;
}
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<input tabIndex="1">
<input tabIndex="2">
<select tabIndex="3">
<option>select menu</option>
</select>
<div tabIndex="4">
a div
</div>
<script>
$("*").live("focus blur", function(e) {
var el = $(this);
setTimeout(function() {
el.toggleClass("focused", el.is(":focus"));
}, 0);
});
</script>
</body>
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