JavaScript to ID credit card type

I’m working on a subscription page which needs to identify the type of the entered credit card number, and display a logo accordingly. I came up with the following script to ID the card:

// get entered cc_number using jQuery
cc_number = $("#cc_number").val();

// remove spaces and hyphens
cc_number = cc_number.replace(/[ -]/g,"");

// initially the card type is unknown
cardtype = '';

// define card names and their matching patterns
ccArray = {"visa"  : "^4[0-9]{12}(?:[0-9]{3})?$",
      "mastercard" : "^5[1-5][0-9]{14}$",
      "discover"   : "^6011[0-9]{12}$",
      "amex"       : "^3[47][0-9]{13}$"};

// identify the card type
for (key in ccArray) {
	regex = new RegExp(ccArray[key]);
	if (regex.test(cc_number)) {
		cardtype = key;

I validate the card number next (JS routine available elsewhere on the web), and if that’s ok, display the logo using the card type.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.