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+---
+title: bookmarks.onChanged
+slug: Mozilla/Add-ons/WebExtensions/API/bookmarks/onChanged
+tags:
+  - API
+  - Add-ons
+  - Bookmarks
+  - Event
+  - Extensions
+  - Non-standard
+  - Reference
+  - WebExtensions
+  - onChanged
+translation_of: Mozilla/Add-ons/WebExtensions/API/bookmarks/onChanged
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>以下の変更に対して発火します。</p>
+
+<ul>
+ <li>ブックマークのタイトルまたは URL</li>
+ <li>フォルダの名前</li>
+</ul>
+
+<h2 id="構文">構文</h2>
+
+<pre class="brush: js">browser.bookmarks.onChanged.addListener(function(
+  id,        // 文字列
+  changeInfo // オブジェクト
+) {...})
+browser.bookmarks.onChanged.removeListener(listener)
+browser.bookmarks.onChanged.hasListener(listener)
+</pre>
+
+<p>このイベントには 3 つのメソッドが用意されています。</p>
+
+<dl>
+ <dt><code>addListener(callback)</code></dt>
+ <dd>イベントリスナを追加します。</dd>
+ <dt><code>removeListener(listener)</code></dt>
+ <dd>イベントリスナを削除します。引数 <code>listener</code> には削除したいリスナを指定します。</dd>
+ <dt><code>hasListener(listener)</code></dt>
+ <dd><code>listener</code> がイベントリスナとして登録されているか確認します。登録されていれば <code>true</code> を、それ以外の場合は <code>false</code> を返します。</dd>
+</dl>
+
+<h2 id="addListener_の構文">addListener の構文</h2>
+
+<h3 id="引数">引数</h3>
+
+<dl>
+ <dt><code>callback</code></dt>
+ <dd>
+ <p>イベントが発火した際に呼び出される関数を指定します。この関数には以下の引数が渡ります。</p>
+ </dd>
+</dl>
+
+<dl>
+ <dd>
+ <dl class="reference-values">
+  <dt><code>id</code></dt>
+  <dd>変更を受けた要素の ID を表す {{jsxref("string")}}</dd>
+ </dl>
+
+ <dl class="reference-values">
+  <dt><code>changeInfo</code></dt>
+  <dd>変更に関する詳細を含んだ {{jsxref("object")}}</dd>
+ </dl>
+ </dd>
+</dl>
+
+<h2 id="付随するオブジェクト">付随するオブジェクト</h2>
+
+<h3 id="changeInfo">changeInfo</h3>
+
+<dl class="reference-values">
+ <dt><code>title</code></dt>
+ <dd>変更された要素のタイトルを表す {{jsxref("string")}}</dd>
+ <dt><code>url</code>{{optional_inline}}</dt>
+ <dd>変更された要素の URL を表す {{jsxref("string")}}。要素がフォルダだった場合に値は入りません。</dd>
+</dl>
+
+<h2 id="ブラウザ実装状況">ブラウザ実装状況</h2>
+
+<p>{{Compat("webextensions.api.bookmarks.onChanged")}}</p>
+
+<h2 id="使用例">使用例</h2>
+
+<pre class="brush: js line-numbers  language-js"><code class="language-js"><span class="keyword token">function</span> <span class="function token">handleChanged</span><span class="punctuation token">(</span>id<span class="punctuation token">,</span> changeInfo<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+  console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="string token">"Item: "</span> <span class="operator token">+</span> id <span class="operator token">+</span> <span class="string token">" changed"</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+  console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="string token">"Title: "</span> <span class="operator token">+</span> changeInfo<span class="punctuation token">.</span>title<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="string token">"Url: "</span> <span class="operator token">+</span> changeInfo<span class="punctuation token">.</span>url<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span>
+
+<span class="keyword token">function</span> <span class="function token">handleClick</span><span class="punctuation token">(</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
+  chrome<span class="punctuation token">.</span>bookmarks<span class="punctuation token">.</span>onChanged<span class="punctuation token">.</span><span class="function token">addListener</span><span class="punctuation token">(</span>handleChanged<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span>
+
+chrome<span class="punctuation token">.</span>browserAction<span class="punctuation token">.</span>onClicked<span class="punctuation token">.</span><span class="function token">addListener</span><span class="punctuation token">(</span>handleClick<span class="punctuation token">)</span><span class="punctuation token">;</span></code></pre>
+
+<p>{{WebExtExamples}}</p>
+
+<div class="note"><strong>謝辞</strong>
+
+<p>この API は Chromium の <a href="https://developer.chrome.com/extensions/bookmarks#method-update"><code>chrome.bookmarks</code></a> API に基づいています。また、このドキュメントは <a href="https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/bookmarks.json"><code>bookmarks.json</code></a> における Chromium のコードから作成されています。</p>
+
+<p>Microsoft Edge の実装状況は Microsoft Corporation から提供されたものであり、ここでは Creative Commons Attribution 3.0 United States License に従います。</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>