Not valid card shows how valid

[oscarhandsome]

Hello @PawelDecowski and developer.
If somebody knows how to resolve this issue please explain to me?

I have a simple input field.
Link on the html
image how it works on my dev

My problem is:
I input number, then with regExp is converting to string with after each 4 digits spaces.
and for example, I added this number 4000 0000 0000 0002 from the main page
then tried ty change last digit and this is not valid, - ok
but i tried to delete last 2-3 digit scipt show that number is valid. i don't understand why on the main page the script works, on my example not.

My script I think very simply.
Code here

[PawelDecowski]

My quick guess is it’s because you’re only checking luhn_valid:

if (result.luhn_valid == true) {
    $('#payfort_fort_card_number').addClass('valid');

You’re not checking if the length is valid:

(you don’t need to compare booleans to true so I removed the == true)

if (result.luhn_valid && result.length_valid) {

There’s a shortcut to check both at once:

if (result.valid) {

[oscarhandsome]

Thank you @PawelDecowski for so fast answer, will try to test with it

[oscarhandsome]

@PawelDecowski
I tried your recommendations, both but if delete last 4 digits this all okay
image
but if I deleted 2 last digits this is valid :)
image

i have no idea why it happens...

if i add 2 wrong last digit
image

on the main page jquerycreditcardvalidator.com my card is validating right, and if remove last digit or change on wrong.

[PawelDecowski]

Visa numbers can be between 13 and 19 digits long. You just happened to end up with a 14 digit long number that has a valid Luhn checksum after removing the last 2 digits. It’s pure chance. Try another number and it’ll most likely fail.

[oscarhandsome]

will check....

@PawelDecowski This validator can work with payfort_fort ?
I just now, understand that your developed script also there.... awesome!

anyway i have weird bug https://prnt.sc/l9smn2