{% extends "admin/change_form.html" %}

{% block extrahead %}
    <script>
        window.addEventListener("load", function () {
            var $ = django.jQuery;

            window.initialData = "";
            var isSubmitting = false;

            $('form').submit(function (event) {
                isSubmitting = true;
                console.log("Form submitted...");
            })

            window.initialData = $('form').serialize();

            $(window).on('beforeunload', function () {
                console.log("[Beforeunload] - Event triggered!");
                var formChanged = $('form').serialize() != window.initialData;
                console.log("[Beforeunload] - Form changed:", formChanged);
                if (!isSubmitting && formChanged) {
                    console.log("[Beforeunload] - Unload prevented!");
                    return 'Du hast ungesicherte Änderungen vorgenommen. Wenn du die Seite verlässt, werden diese gelöscht.'
                }
            });
        })

    </script>
    {{ block.super }}
{% endblock %}