Hi all!
 
I recently started using Formidable forms, I am creating a website for a financial company specializing in consumer loans.
 
I am in the process of creating an application form. One of the requirements is for the applicant to enter his/her SIN (Social Insurance Number.) All SIN's use the Luhn Algorith in order to validate the authenticity of the number.
 
I would like to add custom JS in order to ensure that each each SIN will be legit, I found a sample code online but I am unsure how I could get a version of it to be compatible with Formidable.
 
<script>
    // Javascript program to implement Luhn algorithm
     
    // Returns true if given
    // card number is valid
    function checkLuhn(cardNo)
    {
        let nDigits = cardNo.length;
 
        let nSum = 0;
        let isSecond = false;
        for (let i = nDigits - 1; i >= 0; i--)
        {
 
            let d = cardNo[i].charCodeAt() - '0'.charCodeAt();
 
            if (isSecond == true)
                d = d * 2;
 
            // We add two digits to handle
            // cases that make two digits
            // after doubling
            nSum += parseInt(d / 10, 10);
            nSum += d % 10;
 
            isSecond = !isSecond;
        }
        return (nSum % 10 == 0);
    }
     
    let cardNo = "79927398713";
    if (checkLuhn(cardNo))
      document.write("This is a valid card");
    else
      document.write("This is not a valid card");
     
</script>
Hoping someone could assist me with this! I spoke to support and they recommended I make a post here.