Aviatrix Aviatrix - 23 days ago 16
jQuery Question

Credit Card validation with Jquery

I'm trying to validate credit card numbers with jQuery but i dont want to use the validation plugin , is there any other plugin for doing this?

Answer Source

http://en.wikipedia.org/wiki/Luhn_algorithm

You could minimize this below into a very small footprint in your code.

function isCreditCard( CC )
 {                        
      if (CC.length > 19)
           return (false);

      sum = 0; mul = 1; l = CC.length;
      for (i = 0; i < l; i++)
      {
           digit = CC.substring(l-i-1,l-i);
           tproduct = parseInt(digit ,10)*mul;
           if (tproduct >= 10)
                sum += (tproduct % 10) + 1;
           else
                sum += tproduct;
           if (mul == 1)
                mul++;
           else
                mul--;
      }
      if ((sum % 10) == 0)
           return (true);
      else
           return (false);
 }