Problem with multiple div and onclick button with id parameter

I am trying to make a notification system for a school project, jQuery is not allowed! Each time there is a notification I’m creating a div with an onclick button to acknowledge the notification with the id as parameter.

Then my function JavaScript get the div and pass the notification to a 1 status in SQL with ajax and finally close the div. When I only have one notification it’s working perfectly but when there is multiple div, my script seem unable to close each notification and I need to refresh my page to close each div.

My code:

 foreach($notifs as $notif){
                            $id = $notif["id"]; ?> 
                             <div id="notifAlert">
                                <p><?= $notif["content"]; ?><br> <button onclick="seenNotif(<?= $id; ?>)">OK</button></p>
                            </div>
                    <?php  } } ?>

function seenNotif(idNotif){
    console.log(idNotif);

        const divNotif = document.getElementById("notifAlert");
        const footer = document.getElementById("foot");


            const req = new XMLHttpRequest();
            req.onreadystatechange = function () {
            if (req.readyState === 4){
                footer.removeChild(divNotif);
            }

        };

        req.open("GET", "notifStatut.php?idNotif="+idNotif);
        req.send();

        
}

require ("functions.php");

$idNotif = $_GET["idNotif"];

    $connection = connectDB();

    $query = $connection->prepare("UPDATE notifications SET statut = :statut WHERE id = :idNotif");
    $query->execute([
        "statut" => 1,
        "idNotif" => $idNotif
    ]);

Answer

As said, id’s have to be unique. The simplest solution is to change

in PHP

<div id="notifAlert"> to

<div id="notifAlert<?= $id ?>">

(add $id to the id to make it unique)

and in javascript

document.getElementById("notifAlert") to

document.getElementById("notifAlert"+idNotif)

Th should get you the div you want.