JavaScript Tutorial/Regular Expressions/Credit Card
Содержание
Matching a 16 digit credit card number separated by a single space
<source lang="javascript">
<html> <head> <title>Matching a 16 digit credit card number separated by a single space</title> <script type="text/javascript" language="javascript">
</script> </head> <body>
This page allows you to enter and check a 16 digit credit card number
<form> <button type="Button" onclick="TestGuess()"> Click here to enter card number</button> </form> </body> </html></source>
Matching a 16 digit credit card number with variable number of space characters
<source lang="javascript">
<html> <head> <title>Matching a 16 digit credit card number
with variable number of space characters</title>
<script type="text/javascript" language="javascript">
</script> </head> <body>
This page allows you to enter and check a 16 digit credit card number
<form> <button type="Button" onclick="TestGuess()">Click here to enter card number</button> </form> </body> </html></source>
Validate MasterCard
<source lang="javascript">
<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})$/;
if (reMasterCard.test(sText)) {
var sCardNum = RegExp.$1 + RegExp.$2 + RegExp.$3 + RegExp.$4;
return luhnCheckSum(sCardNum);
} else {
return false;
}
}
function validate() {
var oInput1 = document.getElementById("txt1");
if (isValidMasterCard(oInput1.value)) {
alert("Valid");
} else {
alert("Invalid!");
}
}
</script>
</head>
<body>
MasterCard Number: <input type="text" id="txt1" />
<input type="button" value="Validate" onclick="validate()" />
</body>
</html> Quote from: Professional JavaScript for Web Developers by Nicholas C. Zakas (Author)
- Paperback: 672 pages
- Publisher: Wrox (April 22, 2005)
- Language: English
- ISBN-10: 0764579088
- ISBN-13: 978-0764579080</source>
Validate Visa number
<source lang="javascript">
<HTML>
<head>
<title>Visa Example</title>
<script type="text/javascript">
function luhnCheckSum(sCardNum) {
var iOddSum = 0;
var iEvenSum = 0;
var bIsOdd = true;
for (var i=sCardNum.length-1; i >= 0; i--) {
var iNum = parseInt(sCardNum.charAt(i));
if (bIsOdd) {
iOddSum += iNum;
} else {
iNum = iNum * 2;
if (iNum > 9) {
iNum = eval(iNum.toString().split("").join("+"));
}
iEvenSum += iNum;
}
bIsOdd = !bIsOdd;
}
return ((iEvenSum + iOddSum) % 10 == 0);
}
function isValidVisa(sText) {
var reVisa = /^(4\d{12}(?:\d{3})?)$/;
if (reVisa.test(sText)) {
return luhnCheckSum(RegExp.$1);
} else {
return false;
}
}
function validate() {
var oInput1 = document.getElementById("txt1");
if (isValidVisa(oInput1.value)) {
alert("Valid");
} else {
alert("Invalid!");
}
}
</script>
</head>
<body>
Visa Number: <input type="text" id="txt1" />
<input type="button" value="Validate" onclick="validate()" />
</body>
</html> Quote from: Professional JavaScript for Web Developers by Nicholas C. Zakas (Author)
- Paperback: 672 pages
- Publisher: Wrox (April 22, 2005)
- Language: English
- ISBN-10: 0764579088
- ISBN-13: 978-0764579080</source>
