Install-button verschwindet nach abbruch

src/js/lib/pwa-assets.js

@@ -11,11 +11,26 @@ class DelayPromise extends Promise {
 class InstallManager {
     static init() {
         window.addEventListener('beforeinstallprompt', e => {
-            this.deferredPromt = e;
             e.preventDefault();
-            if (this.canInstallListener) {
-                this.canInstallListener(this.deferredPromt);
-            }
+            this.setDeferredPrompt(e);
+        });
+    }
+
+    static setDeferredPrompt(e){
+        this.deferredPromt = e;
+        if (this.canInstallListener) {
+            this.canInstallListener(this.deferredPromt);
+        }
+    }
+
+    static async prompt(){
+        if (Helper.isNotNull(this.deferredPromt)){
+            this.deferredPromt.prompt();
+            return this.deferredPromt.userChoice();
+        }
+        return Promise.resolve({
+            "outcome":"dismissed",
+            "platform":""
         });
     }