???
Price<input type="radio" value="_price" name="sort">
Color<input type="radio" value="_color" name="sort">
Size<input type="radio" value="_size" name="sort">
<script src="https://code.jquery.com/jquery-latest.min.js"></script>
<script>
$("input:radio").click(function() {
var n = $("input:radio:checked" ).length;
console.log(n, $("input:radio:checked" ).val());
});
</script>