From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: onStateChanged
+slug: Mozilla/Add-ons/WebExtensions/API/captivePortal/onStateChanged
+translation_of: Mozilla/Add-ons/WebExtensions/API/captivePortal/onStateChanged
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>Fires when the captive portal state changes.</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox brush:js">browser.captivePortal.onStateChanged.addListener(callback)
+browser.captivePortal.onStateChanged.removeListener(listener)
+browser.captivePortal.onStateChanged.hasListener(listener)
+</pre>
+
+<p>Events have three functions:</p>
+
+<dl>
+ <dt><code>addListener(callback)</code></dt>
+ <dd>Adds a listener to this event.</dd>
+ <dt><code>removeListener(listener)</code></dt>
+ <dd>Stop listening to this event. The <code>listener</code> argument is the listener to remove.</dd>
+ <dt><code>hasListener(listener)</code></dt>
+ <dd>Check whether <code>listener</code> is registered for this event. Returns <code>true</code> if it is listening, <code>false</code> otherwise.</dd>
+</dl>
+
+<h2 id="addListener_syntax">addListener syntax</h2>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt><code>callback</code></dt>
+ <dd>
+ <p>Function that is called when this event occurs. The function is passed the following arguments:</p>
+
+ <dl class="reference-values">
+  <dt><code>details</code></dt>
+  <dd>
+  <p><code>string</code> The captive portal state, being one of <code>unknown</code>, <code>not_captive</code>, <code>unlocked_portal</code>, or <code>locked_portal</code>.</p>
+  </dd>
+ </dl>
+ </dd>
+</dl>
+
+<h2 id="Examples">Examples</h2>
+
+<p>Handle a change in captive portal status:</p>
+
+<pre class="brush: js">function handlePortalStatus(portalstatusInfo) {
+  console.log("The portal status is now: " + portalstatusInfo.details);
+}
+
+browser.captivePortal.onStateChanged.addListener(handlePortalStatus)
+</pre>
+
+<p>{{WebExtExamples}}</p>
+
+<h2 id="Browser_compatibility">Browser compatibility</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>{{Compat("webextensions.api.captivePortal.onStateChanged")}}</p>
+
+<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>
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