South Africa ID number validation

I've researched this but none of the code I use seems to work. South African ID numbers contain the date of birth and gender. All I want is it to pull in that information and verify it when their ID number is entered into an input field, in angular

I have tried using the javascript code that I currently have just modified it to be in typescript. Im not getting any errors but it's not validating at all.

ts


this.registerForm = this.formBuilder.group({
confirm: ['', [Validators.required, Validators.email]],
};
validateRSAidnumber(idnumber) {
console.log('idnumber', idnumber);

let invalid = 0;

// check that value submitted is a number
if (isNaN(idnumber)) {
invalid++;
}

// check length of 13 digits
if (idnumber.length !== 13) {
invalid++;
}

// check that YYMMDD group is a valid date
const yy = idnumber.substring(0, 2);
const mm = idnumber.substring(2, 4);
const dd = idnumber.substring(4, 6);

const dob = new Date(yy, (mm - 1), dd);

// check values - add one to month because Date() uses 0-11 for months
if (!(((dob.getFullYear() + '').substring(2, 4) === yy) && (dob.getMonth() === mm - 1) && (dob.getDate() === dd))) {
invalid++;
}

// evaluate GSSS group for gender and sequence
const gender = parseInt(idnumber.substring(6, 10), 10) > 5000 ? 'M' : 'F';

// ensure third to last digit is a 1 or a 0
if (idnumber.substring(10, 11) > 1) {
invalid++;
}

// ensure second to last digit is a 8 or a 9
if (idnumber.substring(11, 12) < 8) {
invalid++;
}

// calculate check bit (Z) using the Luhn algorithm
let ncheck = 0;
let beven = false;

for (let c = idnumber.length - 1; c >= 0; c--) {
const cdigit = idnumber.charAt(c);
let ndigit = parseInt(cdigit, 10);

if (beven) {
if ((ndigit *= 2) > 9) ndigit -= 9;
}

ncheck += ndigit;
beven = !beven;
}

if ((ncheck % 10) !== 0) {
invalid++;
}

return !invalid;
}


// convenience getter for easy access to form fields
get f() { return this.registerForm.controls; }
get isEmailMismatch() { return this.registerForm.getError('emailMismatch'); }

onSubmit() {
console.log('buttoj');
this.submitted = true;

this.userService.user.user.email = this.email;
this.userService.user.user.first_name = this.firstName;
this.userService.user.user.last_name = this.lastName;
this.userService.user.user.id_number = this.idNumber;
this.userService.user.user.password = this.password;
this.userService.user.user.phone = '0' + this.contactNumber.toString();
this.userService.user.user.id_number = this.idNumber.toString();
this.registerUser();
this.validateRSAidnumber(this.idNumber);

}

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