aggiunta possibilità di rimuovere il template HTML

README.md

@@ -292,7 +292,8 @@ So you can call the Notifications widget in your app layout to show generated no
 ```
 
 You can customize the HTML template for the widget as follow. 
-When you customize the template remember to include a button with id 'js-web-push-subscribe-button':
+Setting template to false will hide all widget HTML and the browser will prompts the user to allow notifications.
+If you customize the HTML template remember to include a button with id 'js-web-push-subscribe-button':
 
 ```html
 <div>

assets/js/web-notifications.js

@@ -104,16 +104,23 @@ var WebNotifications = (function(opts) {
         });
 
         // initialize page button for subscribe notification
-        subscribeButton.addEventListener('click', function () {
-            if (isSubscribed) {
-                unsubscribe();
-            } else {
+        if(subscribeButton) {
+            subscribeButton.addEventListener('click', function () {
+                if (isSubscribed) {
+                    unsubscribe();
+                } else {
+                    subscribe();
+                }
+            });
+
+            // enable button
+            subscribeButton.disabled = false;
+        }
+        else {
+            if (!isSubscribed) {
                 subscribe();
             }
-        });
-
-        // enable button
-        subscribeButton.disabled = false;
+        }
 
     }
 
@@ -136,7 +143,9 @@ var WebNotifications = (function(opts) {
     function unsubscribe() {
 
         // Disable the button so it can't be changed while we process the permission request
-        subscribeButton.disabled = true;
+        if(subscribeButton) {
+            subscribeButton.disabled = true;
+        }
 
         navigator.serviceWorker.ready.then(function (serviceWorkerRegistration) {
             // To unsubscribe from push messaging, you need get the subscription object, which you can call unsubscribe() on.
@@ -167,7 +176,9 @@ var WebNotifications = (function(opts) {
                     isSubscribed = false;
 
                     updateButtonSubscribeStatus();
-                    subscribeButton.disabled = false;
+                    if(subscribeButton) {
+                        subscribeButton.disabled = false;
+                    }
 
                     return sendUnsubscriptionToServer(pushSubscription);
 
@@ -186,7 +197,9 @@ var WebNotifications = (function(opts) {
     function subscribe() {
 
         // Disable the button so it can't be changed while we process the permission request
-        subscribeButton.disabled = true;
+        if(subscribeButton) {
+            subscribeButton.disabled = true;
+        }
 
         navigator.serviceWorker.ready.then(function (serviceWorkerRegistration) {
             serviceWorkerRegistration.pushManager.subscribe({
@@ -200,7 +213,9 @@ var WebNotifications = (function(opts) {
                     isSubscribed = true;
 
                     updateButtonSubscribeStatus();
-                    subscribeButton.disabled = false;
+                    if(subscribeButton) {
+                        subscribeButton.disabled = false;
+                    }
 
                     return sendSubscriptionToServer(pushSubscription);
 

widgets/WebNotifications.php

@@ -104,6 +104,9 @@ public function run()
     protected function renderSubscribeButton()
     {
 
+        if($this->template === false) {
+            return '';
+        }
         if($this->template) {
             return $this->template;
         }