Javascript : getElementById inside looping For

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 function formValidator(numrows,jumlah_soal) {
  var id_soal = "";
  if (numrows < jumlah_soal) {
   var x = jumlah_soal;
  } else {
   var x = numrows;
  }

  for (var i=1;i<=x;i++) {
   var id = document.getElementById("id_soal_"+i).value;
   if (id_soal == "") {
    var id_soal = id;
   } else {
    var id_soal = id_soal+', '+id;
   }
  }
    
  $.post("actions/soal_simpan.php", { id: id_soal} );
  window.location.href = "index.php?p=soal_create";
  window.open("cetak/soal_simpan.php?id_soal="+id_soal,"print","width=800,height=400px,scrollbars=yes");
 }