jquery - changing bg color on min and max -
    i want change color  of button-down  , button-up  when spinner  have min or max value red   <input type="hidden" name="id" value="<?= $this->product->getid() ?>" /> <input name="quantity" value="1" readonly/>  <script type="text/javascript">     $(document).ready(function () {         $('input[name="quantity"]').spinner({             min: 1,             max: <?= $this->product->getquantity() ?>,         }).keydown(function (e) {             e.preventdefault();         });     }); </script>          you can apply change  method jquery ui spinner provides:       $('input[name="quantity"]').spinner({         min: 1,         max: <?= $this->product->getquantity() ?>,         spin:function(event, ui){            $(this).closest('.ui-spinner').find('a.ui-spinner-button').css('background', function(){           ...