professional-javascript-07-MasterCardExample.htm / htm
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>MasterCard Example</title> <script type="text/javascript"> function luhnCheckSum(sCardNum) { var iOddSum = 0; var iEvenSum = 0; var bIsOdd = true; for (var i=sCardNum.length-1; i >= 0; i--) { var iNum = parseInt(sCardNum.charAt(i)); if (bIsOdd) { iOddSum += iNum; } else { iNum = iNum * 2; if (iNum > 9) { iNum = eval(iNum.toString().split("").join("+")); } iEvenSum += iNum; } bIsOdd = !bIsOdd; } return ((iEvenSum + iOddSum) % 10 == 0); } function isValidMasterCard(sText) { var reMasterCard = /^(5[1-5]\d{2})[\s\-]?(\d{4})[\s\-]?(\d{4})[\s\-]?(\d{4})</script> </head> <body> <p>MasterCard Number: <input type="text" id="txt1" /><br /> <input type="button" value="Validate" onclick="validate()" /></p> </body> </html>
(C) Æliens 20/2/2008
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