JavaScript - Credit Card 16 digit Validation and must be a number not working

Question

I saw this code and tried adding that into my code.

  function validate_creditcardnumber() { var re16digit=/^\\d{16}$/ if (CreditCardNumber.value.search(re16digit)==-1) alert("Please enter your 16 digit credit card numbers"); return false; } 

My code below:

function confirmSubmit() 
{    
var re16digit = /^\d{16}$/

if (document.getElementById("txtCreditCardNumber").value == "" ||
    isNaN(document.getElementById("txtCreditCardNumber").value) ||
    (document.getElementById("txtCreditCardNumber").value.search(re16digit) == -1)) {
    alert("Credit Card number must be a numeric value.");
    document.getElementById("txtCreditCardNumber").focus();
    return false;
}
return true;
}

There wasn't any error shown but when I ran the code, only the .value == " " was working. The other 2 didn't work. I need to have these requirements: Cannot be empty, must be a number and must be 16 digits. Thanks in advance!

Answer 1

dont put together, separate it. after //your alert("Credit Card number must be a numeric value."); document.getElementById("txtCreditCardNumber").focus(); return false; }

//// create the VAR & add in the{ code }