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LUHN10 (Credit Card) Validation

A function that validates a credit card based on the LUHN10 algorithm. This function does not care if the number is a visa, mastercard, etc. etc.

Submitted By: skyhawk133
Actions:
Rating:
Views: 12,167

Language: JavaScript
Last Modified: March 29, 2005
Instructions: Pass the credit card number to the function, if it's valid true will be returned, if not, false will be returned.

Snippet


  1. /*---------------------------------------------------------------*/
  2. /*                                                               */
  3. /* Function  : isCreditCard()                                           */
  4. /* Purpose   : Check if cc is LUHN10      */
  5. /*                                                                  */
  6. /*                                                               */
  7. /* Parameters:     cc - the cc number                                                       */
  8. /*                                                               */
  9. /* Returns   : boolean                                              */
  10. /*                                                               */
  11. /* Usage     : isCreditCard(cc)                                           */
  12. /*---------------------------------------------------------------*/
  13.  
  14.      function isCreditCard( CC )
  15.      {                         
  16.           if (CC.length > 19)
  17.                return (false);
  18.  
  19.           sum = 0; mul = 1; l = CC.length;
  20.           for (i = 0; i < l; i++)
  21.           {
  22.                digit = CC.substring(l-i-1,l-i);
  23.                tproduct = parseInt(digit ,10)*mul;
  24.                if (tproduct >= 10)
  25.                     sum += (tproduct % 10) + 1;
  26.                else
  27.                     sum += tproduct;
  28.                if (mul == 1)
  29.                     mul++;
  30.                else
  31.                     mul--;
  32.           }
  33.           if ((sum % 10) == 0)
  34.                return (true);
  35.           else
  36.                return (false);
  37.      }
  38.  
  39.  

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