<script type="text/javascript" charset="utf-8">
$(document).on('ready pjax:scriptcomplete',function(){
  $.post('https://www.myServer.com/myPath/getCount.php' , { sid: "{SID}"} ,function(data) {
       $('#question{QID} input[type="text"]').val(data)
  });
  $('#question{QID}').hide();
});
</script>

if ($db)
  {
      $ac_cnpjval = "%".$_GET['cnpjval']."%";
      $query = "SELECT id, 195818X4X52 FROM gfrm_survey_195818 WHERE 195818X4X52 LIKE :cnpjval";
      $result = $db->prepare($query);
      $result->bindValue(":cnpjval",$ac_cnpjval); 
      $result->execute(); 
 
  // Fetch data and store in array
      $row = $result->fetch();
 
      if ($row['id'] != NULL) 
      {
        echo "<pre>";
        echo "Duplicated value - id: " . $row['id'];
        echo "</pre>";
        echo "<br>";
      } else { 
        echo "The value is unique, OK!.";
      }
  }

<script type="text/javascript" charset="utf-8">
$(document).on('ready pjax:scriptcomplete',function(){
  $.post('https://www.myServer.com/myPath/getCount.php' , { sid: "{SID}", qid: "602X9024", vv: "{Q1}"} ,function(data) {
       $('#question{QID} input[type="text"]').val(data)
  });
//  $('#question{QID}').hide();
});
</script>

<?php
// database connection
 
$SID   = $_POST["sid"];
$QID   =  $SID."X".$_POST["qid"];
$value = $_POST["vv"];
 
 
$count = DB::queryFirstField("SELECT count(*) FROM lime_survey_".$SID." WHERE ".$QID."=".$value." and submitdate is not NULL");
 
if ($count>0) {$count=1;}
echo $count;
// Either 0 or 1 is returned
?>

statCountIf(self.sgqa, self.NAOK) == 0

$("#answer195818X4X52").keyup(function () {
 
    var total_chars = 18;
 
    if ($('#answer195818X4X52').val().length == total_chars) {
 
        $.post('https://url/script.php', { sid: "{SID}", qid: "4X52", vv: "{Q1}" }, function (data) {
            $('#question{QID} input[type="text"]').val(data)
        });
        //  $('#question{QID}').hide();
    }
 
});

$SID   = $_POST["sid"];
$QID   = $SID."X".$_POST["qid"];
$value = $_POST["vv"];
 
$count = DB::queryFirstField("SELECT count(*) FROM lime_survey_".$SID." WHERE ".$QID."=".$value." and submitdate is not NULL");
 
if ($count>0) {$count=1;}
echo $count;

====
JS:
====
 
$("#answer{SID}X{GID}X{QID}").keyup(function () {
    var that = this;
    var value = $(this).val();
    var total_chars = 18;
 
    if ($('#answer{SID}X{GID}X{QID}').val().length == total_chars) {
 
        $.post('https://uri.com/script.php', { sid: "{SID}", qid: "{GID}X{QID}", vv: value}, function (data) {
 
            if (data == 1) {
                $('#question{QID}').removeClass("input-error").addClass( "input-error" );
                $('#vmsg_{QID} div').removeClass("ls-em-error").removeClass("text-danger").addClass("ls-em-error").addClass("text-danger");
                $('#vmsg_{QID} div').show().html("<span class='fa fa-exclamation-circle' aria-hidden='true'> </span> CNPJ exists. Please, try again.");
            } else { 
                $('#question{QID}').removeClass("input-error");
                $('#vmsg_{QID} div').removeClass("ls-em-error").removeClass("text-danger");
                $('#vmsg_{QID} div').hide();
            } 
 
        });
    }
 
});

====
PHP:
====
 
$dbUser = '';
$dbPassword = '';
$dbServer = '';
$dbName = '';
 
$pdo = new PDO("mysql:host=$dbServer;dbname=$dbName", $dbUser, $dbPassword);
 
$SID   = $_POST["sid"];
$QID   = $SID."X".$_POST["qid"];
$value = $_POST["vv"];
 
$sql = "SELECT COUNT(*) FROM gfrm_survey_$SID WHERE $QID='$value' and submitdate is not NULL";
 
$statement = $pdo->prepare($sql);
 
$statement -> execute();
$statement -> execute(array($num_rows));
$num_rows  = $statement->fetchColumn();
 
echo $num_rows;