cvs commit: jakarta-commons/validator/src/javascript/org/apache/commons/validator/javascript validateCreditCard.js

[rl...@apache.org]

rleland     2003/05/18 14:36:56

  Added:       validator/src/javascript/org/apache/commons/validator/javascript
                        validateCreditCard.js
  Log:
  Add Javascript validations for
  CreditCard
  
  Revision  Changes    Path
  1.1                  jakarta-commons/validator/src/javascript/org/apache/commons/validator/javascript/validateCreditCard.js
  
  Index: validateCreditCard.js
  ===================================================================
  
      function validateCreditCard(form) {
          var bValid = true;
          var focusField = null;
          var i = 0;
          var fields = new Array();
          oCreditCard = new creditCard();
          for (x in oCreditCard) {
              if ((form[oCreditCard[x][0]].type == 'text' ||
                   form[oCreditCard[x][0]].type == 'textarea') &&
                  (form[oCreditCard[x][0]].value.length > 0)) {
                  if (!luhnCheck(form[oCreditCard[x][0]].value)) {
                      if (i == 0) {
                          focusField = form[oCreditCard[x][0]];
                      }
                      fields[i++] = oCreditCard[x][1];
                      bValid = false;
                  }
              }
          }
          if (fields.length > 0) {
              focusField.focus();
              alert(fields.join('\n'));
          }
          return bValid;
      }
  
      /**
       * Reference: http://www.ling.nwu.edu/~sburke/pub/luhn_lib.pl
       */
      function luhnCheck(cardNumber) {
          if (isLuhnNum(cardNumber)) {
              var no_digit = cardNumber.length;
              var oddoeven = no_digit & 1;
              var sum = 0;
              for (var count = 0; count < no_digit; count++) {
                  var digit = parseInt(cardNumber.charAt(count));
                  if (!((count & 1) ^ oddoeven)) {
                      digit *= 2;
                      if (digit > 9) digit -= 9;
                  };
                  sum += digit;
              };
              if (sum == 0) return false;
              if (sum % 10 == 0) return true;
          };
          return false;
      }
  
      function isLuhnNum(argvalue) {
          argvalue = argvalue.toString();
          if (argvalue.length == 0) {
              return false;
          }
          for (var n = 0; n < argvalue.length; n++) {
              if ((argvalue.substring(n, n+1) < "0") ||
                  (argvalue.substring(n,n+1) > "9")) {
                  return false;
              }
          }
          return true;
      }
  
  
  

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