Refresh a value from a table in JavaScript

Hi all,
I am asking for your help on a small project that I am implementing, that of updating a value in my database.
Since there is a value to enter in a textbox, I cannot load everything (well I think) on another page and refresh every second ...
Here is my complete code and I can't refresh Enchere_Max


index.php

<?php try{$Stat = $pdo->query("SELECT * FROM tb_shop_enchere"); while($data = $Stat->fetch(PDO::FETCH_ASSOC)) { $MyId = $data["NumId"]; ?>

<div id="Enchere_<?php echo $MyId; ?>"></div>

<script>
$(document).ready(function() {
	setInterval(function() {
		$('#Enchere_<?php echo $MyId; ?>').load('refresh.php');
	}, 1000);
});
</script>

<?php }}catch(PDOException $e){echo "<div class='alert alert-danger'>".$e->getMessage()."</div>";} ?>

refresh.php

<?php try{$Stat = $pdo->query("SELECT * FROM tb_shop_enchere WHERE NumId = '".$MyId."'"); while($data = $Stat->fetch(PDO::FETCH_ASSOC)) { ?>

<?php echo $data["Enchere_Max"];?>

<?php }}catch(PDOException $e){echo "<div class='alert alert-danger'>".$e->getMessage()."</div>";} ?>

Maybe my method is not the right one, so if you can help me it would be nice.