[MixPetrov]

Имеется форма:

<input type="text" value="1" size="2" oninput="recalc(2);" name="2"/>

И скрипт:

function recalc(product_id) {
		var quantity = $('input[name=\'' + product_id + '\']').val();
		var quantity = typeof(quantity) != 'undefined' ? quantity : 1;
		var options_price = 0;
	
		$('#option_'+product_id+' option:selected, #option_'+product_id+' input:checked').each(function() {
			if ($(this).attr('price_prefix') == '+') { options_price = options_price + Number($(this).attr('price')); }
			if ($(this).attr('price_prefix') == '-') { options_price = options_price - Number($(this).attr('price')); }
		});
	
		var price_no_format = Number($('.change-price'+product_id).attr('price'));
		var special_no_format = Number($('.change-special'+product_id).attr('price'));
		var new_price = (price_no_format + options_price) * quantity;
		var new_special = (special_no_format + options_price) * quantity;
		$('.change-price' + product_id).html(price_format(new_price));
		$('.change-special' + product_id).html(price_format(new_special));
	}

Как добавить ограничение на минимальное и максимальное число ввода в input?
Делал следующим образом

function recalc(product_id) {
		var quantity = $('input[name=\'' + product_id + '\']').val(nquantity);
               var nquantity = +$('input[name=\'' + product_id + '\']').val().value.replace(/\D/g,'')||0;
                if (value>maximum) value=maximum;
                if (value<minimum) value=minimum;
		var quantity = typeof(quantity) != 'undefined' ? quantity : 1;
		var options_price = 0;
	
		$('#option_'+product_id+' option:selected, #option_'+product_id+' input:checked').each(function() {
			if ($(this).attr('price_prefix') == '+') { options_price = options_price + Number($(this).attr('price')); }
			if ($(this).attr('price_prefix') == '-') { options_price = options_price - Number($(this).attr('price')); }
		});
	
		var price_no_format = Number($('.change-price'+product_id).attr('price'));
		var special_no_format = Number($('.change-special'+product_id).attr('price'));
		var new_price = (price_no_format + options_price) * quantity;
		var new_special = (special_no_format + options_price) * quantity;
		$('.change-price' + product_id).html(price_format(new_price));
		$('.change-special' + product_id).html(price_format(new_special));
	}

Не получилось. Подскажитеак выполнить такую обработку?