<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>check input</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.pack.js"></script>
</head>
<body>
<label for="id_checbox">
<input type="checkbox" id="id_checbox">Zaznacz
</label>
<script>
$('#id_checbox').change(function() {
if ($(this).is(':checked')) {
console.log('Checked');
} else {
console.log('Unchecked');
}
});
</script>
</body>
</html>