Question

I have this code here http://jsfiddle.net/RzBeM/65/ you will see two input fields called quantity. Basically the first part multiplies the quantity by the Card Points value and returns a value and in the second part the quantity multiplies by the Card Value and gives a value. The problem is i have to enter in the number into both inputs i would like to have one input but do both multiplications at once. Also if you type in a value and erase it it displays NaN how do i prevent that?

Answer 1

here you have a modified version of your code. i removed the second quantity input

$("input[id*=-id-]").keyup(function() {
    var quantity = $(this).val();
    var cardPoints = parseInt($(this).parents("tr").find('input:eq(1)').val());
    var realValue = parseInt($(this).parents("tr").find('input:eq(2)').val());

    cardCalc = cardPoints * quantity;
    realCalc = realValue * quantity;

    $(this).parents("tr").find("td:eq(2)").html(cardCalc);
    $(this).parents("tr").find("td:eq(4)").html(realCalc);
});

fiddle: http://jsfiddle.net/manuel/RzBeM/82/