Javascript Get Whatsapp Number in Group

get_whatsapp_group_number.js

phoneNumber = []
i = 0;

function saveArray() {
  console.log('scroll down !');

  nomor = document.querySelectorAll('._2sNbV ._25Ooe ._1wjpf');
  nomor.forEach(element => {
    n = element.getAttribute('title')
    if (phoneNumber.indexOf(n) == -1) {
      phoneNumber.push(n);
      console.log('Add number : ' + n);
    }
    else {
      console.log('skip duplicate : ' + n);
    }
  });
}

function getNumber() {
  i = 0;
  scrollSpeed = 50;
  saveArrScroll = document.getElementsByClassName("_2sNbV")[0].addEventListener('scroll', saveArray);
  batas = document.getElementsByClassName('AfVTG')[0].clientHeight;

  getNumberInterval = setInterval(function(){
      scrollDown = document.getElementsByClassName('_2sNbV')[0].scroll(0,i);
      if (i > batas) {
        clearInterval(getNumberInterval);
        document.getElementsByClassName("_2sNbV")[0].removeEventListener('scroll', saveArrScroll);
        console.log('OK Selesai ambil nomor');
        console.log(phoneNumber);
        prompt("Copy nomor ini", JSON.stringify(phoneNumber))
        i = 0;
      }
      i += scrollSpeed;
      console.log('scroll ' + i);
    }, 100);
}

var start = confirm("Press OK! untuk mulai mengambil!");
if (start == true) {
    try {
      getNumber();
    } catch (e) {
      alert('ada kesalahan, pastikan sudah mengklik di group info pada grup Whatsapp Anda');
    } 
} else {
    alert('batal');
}