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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: ExtendableMessageEvent.lastEventId
+slug: Web/API/ExtendableMessageEvent/lastEventId
+tags:
+ - API
+ - Experimental
+ - ExtendableMessageEvent
+ - Property
+ - Reference
+ - Service Workers
+ - lastEventID
+translation_of: Web/API/ExtendableMessageEvent/lastEventId
+---
+<p>{{APIRef("Service Workers API")}}{{SeeCompatTable}}</p>
+
+<p>La propriété en lecture seule <strong><code>lastEventID</code></strong> de l'interface {{domxref("ExtendableMessageEvent")}} représente, dans <a href="https://developer.mozilla.org/en-US/docs/Web/API/en-US/docs/Server-sent_events/Using_server-sent_events">les évenements envoyés par lle serveur</a>, le dernier ID de l'évenement source.</p>
+
+<h2 id="Syntaxe">Syntaxe</h2>
+
+<pre class="syntaxbox">var myLastEventId = ExtendableMessageEventInstance.lastEventId;</pre>
+
+<h3 id="Value">Value</h3>
+
+<p>Une {{domxref("DOMString")}}.</p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<p>Le code suivant est utilisé, dans un service worker, pour répondre à un message push en envoyant les données reçues par le  {{domxref("PushMessageData")}} au contexte principale, via le <a href="/en-US/docs/Web/API/Channel_Messaging_API">canal de messages</a>. L'objet événement de <code>onmessage</code> sera un <code>ExtendableMessageEvent.</code></p>
+
+<pre class="brush: js">var port;
+
+self.addEventListener('push', function(e) {
+ var obj = e.data.json();
+
+ if(obj.action === 'subscribe' || obj.action === 'unsubscribe') {
+ port.postMessage(obj);
+ } else if(obj.action === 'init' || obj.action === 'chatMsg') {
+ port.postMessage(obj);
+ }
+});
+
+self.onmessage = function(e) {
+ console.log(e.lastEventId);
+ port = e.ports[0];
+}
+</pre>
+
+<h2 id="Spécifications">Spécifications</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Spécification</th>
+ <th scope="col">Statut</th>
+ <th scope="col">Commentaire</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Service Workers', '#extendablemessage-event-lasteventid-attribute', 'ExtendableMessageEvent.lastEventId')}}</td>
+ <td>{{Spec2('Service Workers')}}</td>
+ <td>Définition initiale.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilités_des_navigateurs">Compatibilités des navigateurs</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Fonctionnalité</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari (WebKit)</th>
+ </tr>
+ <tr>
+ <td>Support de base</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatGeckoDesktop("45.0")}}<sup>[1]</sup></td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatNo}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Fonctionnalité</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>Support de base</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Service workers (and <a href="/en-US/docs/Web/API/Push_API">Push</a>) have been disabled in the <a href="https://www.mozilla.org/en-US/firefox/organizations/">Firefox 45 Extended Support Release</a> (ESR.)</p>
+
+<h2 id="Voir_aussi">Voir aussi</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker_API/Using_Service_Workers">Utilisation des Service Workers</a></li>
+ <li><a class="external external-icon" href="https://github.com/mdn/sw-test">Exemple simple des service workers</a></li>
+ <li><a class="external external-icon" href="https://jakearchibald.github.io/isserviceworkerready/">Est-ce que les service workers sont prêts ?</a></li>
+ <li><a href="/en-US/docs/Web/API/Channel_Messaging_API">Canal de messages</a></li>
+</ul>