btcpayserver/BTCPayServer/Views/Shared/LayoutPartials/NotificationsNavItem.cshtml

@inject LinkGenerator linkGenerator

<div></div>
@await Component.InvokeAsync("NotificationsDropdown")
<script type="text/javascript">

var supportsWebSockets = 'WebSocket' in window && window.WebSocket.CLOSING === 2;

    if (supportsWebSockets) {

    var loc = window.location, ws_uri;
    if (loc.protocol === "https:") {
        ws_uri = "wss:";
    } else {
        ws_uri = "ws:";
    }
    ws_uri += "//" + loc.host;
    ws_uri += "@linkGenerator.GetPathByAction("SubscribeUpdates", "Notifications")";
    var newDataEndpoint = "@linkGenerator.GetPathByAction("GetNotificationDropdownUI", "Notifications")";

    try {
        socket = new WebSocket(ws_uri);
        socket.onmessage = function (e) {
            $.get(newDataEndpoint, function(data){
                $("#notifications-nav-item").replaceWith($(data));
           });
        };
        socket.onerror = function (e) {
            console.error("Error while connecting to websocket for notifications (callback)", e);
        };
    }
    catch (e) {
        console.error("Error while connecting to websocket for notifications", e);
    }
}

</script>