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

This does not have four fields, but it does validate credit cards (integrity check, not Luhn's Algorithm!). I have to tell you how annoying it is to use multiple fields for a user and auto-tabbing. I recommend you only use one field.

From jquery website:

$("#myform").validate({
  rules: {
    field: {
      required: true,
      creditcard: true
    }
  }
});

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  Required, creditcard (try 446-667-651):