check id number if ok

[beitaltamweelsa]

i have a code to check if the id number is ok
i created a wix form have a full name and id number
the code is not running!
any help please
the idea is to check if number is = 10 digits
thanks!

Here is my code

---

'use strict';
/**
 * @return {number}
 */
function validateSAID(id) {
 
  id = id.trim();
 if (isNaN(parseInt(id))) {
 return -1;
  }
 if (id.length !== 10) {
 return -1;
  }
 var type = id.substr(0, 1);
 if (type !== '2' && type !== '1') {
 return -1;
  }
 var sum = 0;
 for (var i = 0; i < 10; i++) {
 if (i % 2 === 0) {
 var ZFOdd = String('00' + String(Number(id.substr(i, 1)) * 2)).slice(-2);
      sum += Number(ZFOdd.substr(0, 1)) + Number(ZFOdd.substr(1, 1));
    } else {
      sum += Number(id.substr(i, 1));
    }

  }
 return (sum % 10 !== 0) ? -1 : type;
}

and a snapshot of the form

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