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| <script language="javascript">
<!--
function Mod10(ccNumb) {
var valid = "0123456789";
var len = ccNumb.length;
var iCCN = parseInt(ccNumb);
var sCCN = ccNumb.toString();
sCCN = sCCN.replace (/^\s+|\s+$/g,''); // strip spaces
var iTotal = 0; // integer total set at zero
var bNum = true; // by default assume it is a number
var bResult = false; // by default assume it is NOT a valid cc
var temp; // temp variable for parsing string
var calc; // used for calculation of each digit
// Determine if the ccNumb is in fact all numbers
for (var j=0; j<len; j++) {
temp = "" + sCCN.substring(j, j+1);
if (valid.indexOf(temp) == "-1"){bNum = false;}
}
// if it is NOT a number, you can either alert to the fact, or just pass a failure
if(!bNum){
/*alert("Not a Number");*/bResult = false;
}
// Determine if it is the proper length
if((len == 0)&&(bResult)){ // nothing, field is blank AND passed above # check
bResult = false;
} else{ // ccNumb is a number and the proper length - let's see if it is a valid card number
if(len >= 15){ // 15 or 16 for Amex or V/MC
for(var i=len;i>0;i--){ // LOOP throught the digits of the card
calc = parseInt(iCCN) % 10; // right most digit
calc = parseInt(calc); // assure it is an integer
iTotal += calc; // running total of the card number as we loop - Do Nothing to first digit
i--; // decrement the count - move to the next digit in the card
iCCN = iCCN / 10; // subtracts right most digit from ccNumb
calc = parseInt(iCCN) % 10 ; // NEXT right most digit
calc = calc *2; // multiply the digit by two
// Instead of some screwy method of converting 16 to a string and then parsing 1 and 6 and then adding them to make 7,
// I use a simple switch statement to change the value of calc2 to 7 if 16 is the multiple.
switch(calc){
case 10: calc = 1; break; //5*2=10 & 1+0 = 1
case 12: calc = 3; break; //6*2=12 & 1+2 = 3
case 14: calc = 5; break; //7*2=14 & 1+4 = 5
case 16: calc = 7; break; //8*2=16 & 1+6 = 7
case 18: calc = 9; break; //9*2=18 & 1+8 = 9
default: calc = calc; //4*2= 8 & 8 = 8 -same for all lower numbers
}
iCCN = iCCN / 10; // subtracts right most digit from ccNum
iTotal += calc; // running total of the card number as we loop
} // END OF LOOP
if ((iTotal%10)==0){ // check to see if the sum Mod 10 is zero
bResult = true; // This IS (or could be) a valid credit card number.
} else {
bResult = false; // This could NOT be a valid credit card number
}
}
}
// change alert to on-page display or other indication as needed.
if(bResult) {
}
if(!bResult){
alert("Le numero de carte bancaire saisi n'est pas valide !");
}
return bResult; // Return the results
}
function verifChamp(champ) {
if(event.keyCode>=48 && event.keyCode<=57 && champ.value.length<=15 || event.keyCode == 8 || event.keyCode == 13 || event.keyCode == 18 || event.keyCode == 9 || event.keyCode == 91) {
return true;
} else {
return false;
}
}
//-->
</script>
<form onsubmit="return Mod10(document.form.cb.value)" name="form">
<input type="text" size="15" name="cb" onkeydown="return verifChamp(this)">
<input type="submit" onclick="return Mod10(this.form.cb.value)" value="OK">
</form> |
