keyup

$(document).on('keyup', '.quantity', function() {
	var el = $(this);
        var root = el.parents('tr');
        var currentName = root.find('.kodebarang').val();
        var currentStock = root.find('.stock').val();
        var totalCurrentQty = 0;
        $(".kodebarang").each(function() {
            var currentScanName = $(this);
            var currentScanRoot = currentScanName.parents('tr');
            var currentScanNameValue = currentScanName.val();
            if (currentScanNameValue == currentName) {
                var tmpQtyValue = currentScanRoot.find('.quantity').val();
                totalCurrentQty = totalCurrentQty + parseInt(tmpQtyValue);
            }
        })
        if (totalCurrentQty > currentStock) {
					 $(this).css("background-color", "red");
                   $('button').prop('disabled', true);
       }
       else
       {
       		$(this).css("background-color", "#fff");
			 $('button').prop('disabled', false);
		}
})