Credit Card formatter in Javascript

Murat Polater December 4, 2020 Reply

Here is a compact solution with jquery:

$("#card_number").keyup(function() {
var foo = $(this).val().replace(/\s+/g, "").replace(/[^0-9]/gi, ""); // remove non numeric
foo = foo.split(" ").join(""); // remove spaces
if (foo.length > 0) {
foo = foo.match(new RegExp(".{1,4}", "g")).join(" ").slice(-23); // max 23 chars
}
$(this).val(foo);
});

Anonymous January 21, 2023 Reply

thank you