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+---
+title: sessions.onChanged
+slug: Mozilla/Add-ons/WebExtensions/API/sessions/onChanged
+tags:
+  - API
+  - Add-ons
+  - Event
+  - Extensions
+  - Non-standard
+  - Reference
+  - WebExtensions
+  - onChanged
+  - sessions
+translation_of: Mozilla/Add-ons/WebExtensions/API/sessions/onChanged
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>Mise en place lorsque une liste d'onglets fermes ou de fenêtre changes.</p>
+
+<h2 id="Syntaxe">Syntaxe</h2>
+
+<pre class="syntaxbox brush:js">browser.sessions.onChanged.addListener(listener)
+browser.sessions.onChanged.removeListener(listener)
+browser.sessions.onChanged.hasListener(listener)
+</pre>
+
+<p>Les événements ont trois fonctions :</p>
+
+<dl>
+ <dt><code>addListener(callback)</code></dt>
+ <dd>Ajoute un auditeur à un événement.</dd>
+ <dt><code>removeListener(listener)</code></dt>
+ <dd>Arrêtez d'écouter cet événement. L'argument de l'auditeur est un auditeur à supprimer.</dd>
+ <dt><code>hasListener(listener)</code></dt>
+ <dd>Vérifiez si l'auditeur est enregistré pour cet événement. Renvoie Vrai s'il écoute. Sinon Faux.</dd>
+</dl>
+
+<h2 id="Syntaxe_addListener">Syntaxe addListener</h2>
+
+<h3 id="Paramètres">Paramètres</h3>
+
+<dl>
+ <dt><code>callback</code></dt>
+ <dd>
+ <p>Fonction qui sera appelée lors de l'événement. Il ne passe aucun paramètre.</p>
+ </dd>
+</dl>
+
+<h2 id="Compatibilité_du_navigateur">Compatibilité du navigateur</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p><span class="diff_add">{{Compat("webextensions.api.sessions.onChanged")}}</span></p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<p>Cette extension écoute <code>onChanged</code>, puis restaure  immédiatement la dernière session fermée, ce qui rend impossible de fermer les fenêtres ou les onglets :</p>
+
+<pre class="brush: js">function restoreSession(sessionInfos) {
+  if (!sessionInfos.length) {
+    console.log("No sessions found")
+    return;
+  }
+  let sessionInfo = sessionInfos[0];
+  if (sessionInfo.tab) {
+    browser.sessions.restore(sessionInfo.tab.sessionId);
+  } else {
+    browser.sessions.restore(sessionInfo.window.sessionId);
+  }
+}
+
+function onError(error) {
+  console.log(error);
+}
+
+function restoreMostRecent() {
+  var gettingSessions = browser.sessions.getRecentlyClosed({
+    maxResults: 1
+  });
+  gettingSessions.then(restoreSession, onError);
+}
+
+browser.sessions.onChanged.addListener(restoreMostRecent);</pre>
+
+<p>{{WebExtExamples}}</p>
+
+<div class="note"><strong>Remerciements</strong>
+
+<p>Cette API est basée sur l'API Chromium <a href="https://developer.chrome.com/extensions/sessions"><code>chrome.sessions</code></a>.</p>
+
+<p>Les données de compatibilité relatives à Microsoft Edge sont fournies par Microsoft Corporation et incluses ici sous la licence Creative Commons Attribution 3.0 pour les États-Unis.</p>
+</div>
+
+<div class="hidden">
+<pre>// Copyright 2015 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+</pre>
+</div>