upo-senior-assistant/SeniorAssistant/Views/Shared/Notifications.cshtml

@model string
@inject IDataContextFactory<SeniorDataContext> dbFactory

@{
    var db = dbFactory.Create();
    var notifications = (from n in db.Notifications
                         where n.Username.Equals(Model) && n.Seen == false
                         orderby n.Time
                         select n).ToArray();
    var num = notifications.Length;
}

<!--
<script>
    $(document).ready(
        $.ajax({
            type: "POST",
            dataType: "json",
            url: "/Account/_notification",
            data: { Username: "@Model", Message: "stronzo" },
            success: function (data) {
                console.log(data);
            }
        })
    );
</script>
-->

<a id="id-notification-toggle" href="#" class="dropdown-toggle" data-toggle="dropdown">
    <i class="fa fa-bell-o"></i>
    @if (num != 0)
    {
        <span class="label label-warning">@num</span>
    }
</a>
@if (num != 0)
{
    <ul id="id-notification-drop" class="dropdown-menu">
        <li class="header">You have @num notifications</li>
        <li>
            <!-- Inner Menu: contains the notifications -->
            <ul class="menu">
                @foreach (var notification in notifications)
                {
                    <li>
                        <!-- start notification -->
                        <a id="notification-@notification.Id" href="#">
                            <i class="fa fa-users text-aqua">@notification.Time</i><br />
                            @notification.Message
                        </a>
                    </li>
                    <!-- end notification -->
                }
            </ul>
        </li>
        <!-- <li class="footer"><a href="#">View all</a></li> -->
    </ul>

    <script>
        var user = "@Model";
        $("[id^='notification-']").on("click", function () {
            var id = this.id.replace(/notification-/g, '');
            var allId = this.id;
            $.ajax({
                type: "PUT",
                dataType: "json",
                url: "/Account/_notification",
                data: { id: id },
                success: function () {
                    $("#" + allId).remove();
                    var num = parseInt($("#id-notification-toggle span").html()) - 1;
                    if (num == 0) {
                        $("#id-notification-toggle span").remove();
                        $("#id-notification-drop").remove();
                    }
                    else
                        $("#id-notification-toggle span").html(num);
                }
            });
        });
    </script>
}