---
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">
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</pre>
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