added shipping note service worker

application/WarehouseShippingNote/WarehouseShippingNoteController.php

@@ -30,6 +30,7 @@ class WarehouseShippingNoteController extends TTCrud {
     protected array $defaultOrder = ['key' => 'create', 'order' => 'DESC'];
 
     protected array $additionalJSVariables = ['WAREHOUSE_ADMIN' => true];
+    protected array $additionalHead = ['<link rel="manifest" href="/assets/pwa/shipping-note-manifest.json">'];
 
     protected array $infoMessages = ['create' => 'Lieferschein wurde erstellt.',
                                      'update' => 'Lieferschein wurde aktualisiert',
@@ -593,4 +594,31 @@ class WarehouseShippingNoteController extends TTCrud {
         $logs = WarehouseLogModel::getAll(['table' => 'WarehouseShippingNote','rowId' => $shippingNoteId], null, 0, ['order' => 'DESC', 'key' => 'create']);
         self::returnJson($logs);
     }
+
+    protected function swAction() {
+        $javascript = "self.addEventListener('install', event => {
+    console.log('Patching PWA Service Worker: Installing...');
+});
+
+self.addEventListener('activate', event => {
+    console.log('Patching PWA Service Worker: Activating...');
+});
+
+self.addEventListener('fetch', event => {
+   event.respondWith(fetch(event.request));
+});
+
+console.log('Patching PWA Service Worker: Script loaded.');";
+
+        header("Content-Type: application/javascript");
+        header("Service-Worker-Allowed: /");
+        header("Cache-Control: no-cache");
+        header("Pragma: no-cache");
+        header("Expires: 0");
+
+        echo $javascript;
+        exit;
+
+    }
+
 }