main.js

const form = document.getElementById('control-row');
const go = document.getElementById('go');
const input = document.getElementById('input');
const message = document.getElementById('message');


form.addEventListener('submit', handleFormSubmit);

async function handleFormSubmit(event) {
  event.preventDefault();

  clearMessage();

  let url = TCNOKontrol(input.value);
  if (!url) {
    setMessage('Geçersiz Tc Kimlik No',"red");
    return;
  }
  setMessage('Geçerli Tc Kimlik No',"green");
}
 
function setMessage(str,color) {
  message.textContent = str;
  message.hidden = false;
  message.style.color = color;
}

function clearMessage() {
  message.hidden = true;
  message.textContent = '';
}
function TCNOKontrol(TCNO) {
    var tek = 0,
      cift = 0,
      sonuc = 0,
      TCToplam = 0,
      i = 0,
      hatali = [11111111110, 22222222220, 33333333330, 44444444440, 55555555550, 66666666660, 7777777770, 88888888880, 99999999990];;

    if (TCNO.length != 11) return false;
    if (isNaN(TCNO)) return false;
    if (TCNO[0] == 0) return false;

    tek = parseInt(TCNO[0]) + parseInt(TCNO[2]) + parseInt(TCNO[4]) + parseInt(TCNO[6]) + parseInt(TCNO[8]);
    cift = parseInt(TCNO[1]) + parseInt(TCNO[3]) + parseInt(TCNO[5]) + parseInt(TCNO[7]);

    tek = tek * 7;
    sonuc = Math.abs(tek - cift);
    if (sonuc % 10 != TCNO[9]) return false;

    for (var i = 0; i < 10; i++) {
      TCToplam += parseInt(TCNO[i]);
    }

    if (TCToplam % 10 != TCNO[10]) return false;

    if (hatali.toString().indexOf(TCNO) != -1) return false;

    return true;
  }