---
title: Push API
slug: Web/API/Push_API
translation_of: Web/API/Push_API
---
<div>{{DefaultAPISidebar("Push API")}}{{SeeCompatTable}}</div>

<p class="summary"><strong>Push API</strong> daje aplikacjom web możliwość odbierania wiadomości przesłanych z serwera, niezależnie do tego czy aplikacja pracuje w tle, lub jest wogóle załadowana w przeglądarce internetowej. To pozwala programistom dostarczać (asynchronicznie) powiadomienia i aktualizacje do użytkowników którzy zezwolili na przesyłanie notyfikacj, w efekcie mamy lepszą komunikację z użytkownikiem, którzy dostają nowe treści w odpowiednim czasie.th timely new content.</p>

<h2 id="Pojęcia_i_stosowanie">Pojęcia i stosowanie</h2>

<p>For an app to receive push messages, it has to have an active <a href="/en-US/docs/Web/API/ServiceWorker_API">service worker</a>. When the service worker is active, it can subscribe to push notifications, using {{domxref("PushManager.subscribe()")}}.</p>

<p>The resulting {{domxref("PushSubscription")}} includes all the information that the application needs to send a push message: an endpoint and the encryption key needed for sending data.</p>

<p>The service worker will be started as necessary to handle incoming push messages, which are delivered to the {{domxref("ServiceWorkerGlobalScope.onpush")}} event handler. This allows apps to react to push messages being received, for example, by displaying a notification (using {{domxref("ServiceWorkerRegistration.showNotification()")}}.)</p>

<p>Each subscription is unique to a service worker.  The endpoint for the subscription is a unique <a href="http://www.w3.org/TR/capability-urls/">capability URL</a>: knowledge of the endpoint is all that is necessary to send a message to your application. The endpoint URL therefore needs to be kept secret, or other applications might be able to send push messages to your application.</p>

<p>Activating a service worker to deliver a push message can result in increased resource usage, particularly of the battery. Different browsers have different schemes for handling this, there is currently no standard mechanism. Firefox allows a limited number (quota) of push messages to be sent to an application, although Push messages that generate notifications are exempt from this limit. The limit is refreshed each time the site is visited. In comparison, Chrome applies no limit, but requires that every push message causes a notification to be displayed.</p>

<div class="note">
<p><strong>Note</strong>: As of Gecko 44, the allowed quota of push messages per application is not incremented when a new notification fires, when another is still visible, for a period of three seconds. This handles cases where a burst of notifications is received, and not all generate a visible notification.</p>
</div>

<div class="note">
<p><strong>Note</strong>: Chrome versions earlier than 52 require you to set up a project on <a href="https://developers.google.com/cloud-messaging/">Google Cloud Messaging</a> to send push messages, and use the associated project number and API key when sending push notifications. It also requires an app manifest, with some special parameters to use this service.</p>
</div>

<h2 id="Interfejsy">Interfejsy</h2>

<dl>
 <dt>{{domxref("PushEvent")}}</dt>
 <dd>Represents a push action, sent to the <a href="/en-US/docs/Web/API/ServiceWorkerGlobalScope">global scope</a> of a {{domxref("ServiceWorker")}}. It contains information sent from an application to a {{domxref("PushSubscription")}}.</dd>
 <dt>{{domxref("PushManager")}}</dt>
 <dd>Provides a way to receive notifications from third-party servers, as well as request URLs for push notifications. This interface has replaced the functionality offered by the obsolete {{domxref("PushRegistrationManager")}} interface.</dd>
 <dt>{{domxref("PushMessageData")}}</dt>
 <dd>Provides access to push data sent by a server, and includes methods to manipulate the received data.</dd>
 <dt>{{domxref("PushSubscription")}}</dt>
 <dd>Provides a subcription's URL endpoint, and allows unsubscription from a push service.</dd>
</dl>

<h2 id="Wzbogacenia_Service_worker">Wzbogacenia Service worker</h2>

<p>The following additions to the <a href="/en-US/docs/Web/API/Service_Worker_API">Service Worker API</a> have been specified in the Push API spec to provide an entry point for using Push messages. They also monitor and respond to push and subscription change events.</p>

<dl>
 <dt>{{domxref("ServiceWorkerRegistration.pushManager")}} {{readonlyinline}}</dt>
 <dd>Returns a reference to the {{domxref("PushManager")}} interface for managing push subscriptions including subscribing, getting an active subscription, and accessing push permission status. This is the entry point into using Push messaging.</dd>
 <dt>{{domxref("ServiceWorkerGlobalScope.onpush")}}</dt>
 <dd>An event handler fired whenever a {{Event("push")}} event occurs; that is, whenever a server push message is received.</dd>
 <dt>{{domxref("ServiceWorkerGlobalScope.onpushsubscriptionchange")}}</dt>
 <dd>An event handler fired whenever a {{Event("pushsubscriptionchange")}} event occurs; for example, when a push subscription has been invalidated, or is about to be invalidated (e.g. when a push service sets an expiration time.)</dd>
</dl>

<h2 id="Przykłady">Przykłady</h2>

<p><a href="https://serviceworke.rs/">ServiceWorker Cookbook</a> Mozilli zawiera dużo przydatnych przykładów Push.</p>

<h2 id="Specyfikacje">Specyfikacje</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName("Push API")}}</td>
   <td>{{Spec2("Push API")}}</td>
   <td>Initial definition</td>
  </tr>
 </tbody>
</table>

<h2 id="Zgodność_przeglądarek">Zgodność przeglądarek</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Funkcjonalność</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatChrome(42.0)}}</td>
   <td>{{CompatGeckoDesktop(44.0)}}<sup>[1][3]</sup></td>
   <td>{{CompatNo}}<sup>[2]</sup></td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
  <tr>
   <td>{{domxref("PushEvent.data")}},<br>
    {{domxref("PushMessageData")}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoDesktop(44.0)}}<sup>[3]</sup></td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Android Webview</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Firefox OS</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoMobile(48.0)}}<sup>[4]</sup></td>
   <td>{{CompatNo}}</td>
   <td>{{CompatUnknown}}<sup>[2]</sup></td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatChrome(42.0)}}</td>
  </tr>
  <tr>
   <td>{{domxref("PushEvent.data")}},<br>
    {{domxref("PushMessageData")}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoMobile(48.0)}}<sup>[4]</sup></td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<ul>
 <li>[1] Aktualnie dostępne tylko dla wersji desktop przeglądarek Firefox; również, wiadomości push są dostarczane tylko wtedy gdy Firefox jest uruchomiony.</li>
 <li>[2] Aktualnie nie jest zaimplementowane. Zobacz <a href="https://dev.modern.ie/platform/status/pushapi/">Microsoft Edge status information</a>.</li>
 <li>[3] Push (i <a href="/en-US/docs/Web/API/Service_Worker_API">Service Workers</a>) zostały zablokowane w wersjach przeglądarek <a href="https://www.mozilla.org/en-US/firefox/organizations/">Firefox 45 and 52 Extended Support Releases</a> (ESR.)</li>
 <li>[4] Push jest już dostępny (domoyślnie) w przeglądarkach Firefox oraz Android version 48.</li>
</ul>

<h2 id="Zobacz_również">Zobacz również</h2>

<ul>
 <li><a href="https://blog.mozilla.org/services/2016/08/23/sending-vapid-identified-webpush-notifications-via-mozillas-push-service/">Sending VAPID identified WebPush Notifications via Mozilla’s Push Service</a></li>
 <li><a href="http://updates.html5rocks.com/2015/03/push-notificatons-on-the-open-web">Push Notifications on the Open Web</a>, Matt Gaunt</li>
 <li><a href="/en-US/docs/Web/API/Service_Worker_API">Service Worker API</a></li>
</ul>