I was needing a way for the user to select none or just one item in a set... here is how I've managed to achieve this functionality using jQuery:
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript" language="javascript">
$(document).ready(function() {
$('.mutuallyexclusive').click(function () {
checkedState = $(this).attr('checked');
$('.mutuallyexclusive:checked').each(function () {
$(this).attr('checked', false);
});
$(this).attr('checked', checkedState);
});
});
</script>
</head>
<body>
<div>
Red: <input id="chkRed" name="chkRed" type="checkbox" value="red" class="mutuallyexclusive">
Blue: <input id="chkBlue" name="chkBlue" type="checkbox" value="blue" class="mutuallyexclusive">
Green: <input id="chkGreen" name="chkGreen" type="checkbox" value="green" class="mutuallyexclusive">
</div>
</body>
</html>
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