<script> function disableFlashMessage(){ setTimeout(function() { $("#flashMsg").children().each(function(){ $(this).remove(); }); }, 3000); }</script> <div id="flashMsg">{% for label, messages in app.flashes %} {% for message in messages %} <div class="alert alert-{{ label }} alert-dismissible fade show"> {{ message|raw }} {% if message is defined %}<script> disableFlashMessage(); </script>{% endif %} </div> {% endfor %}{% endfor %}</div>