Moving a focus when the input text field reaches a max length

Question

I do have a credit card number form. The number is divided into four parts just as on a real credit card.

I want to add a JavaScript taste to the form where when a u

Answer 1

I haven't tested it, but I think this will work. It will probably also move the focus to the button when the 4th field is completed.

$("form input").change(function () {
    var maxLength = $(this).attr('maxlength');

    if($(this).val().length == maxLength) {
        $(this).next().focus();
    }
}