< HTML>
Visa Example
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!");
}
}
Visa Number: