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+---
+title: bookmarks.onImportBegan
+slug: Mozilla/Add-ons/WebExtensions/API/bookmarks/onImportBegan
+tags:
+  - API
+  - Add-ons
+  - Bookmarks
+  - Event
+  - Extensions
+  - Non-standard
+  - Reference
+  - WebExtensions
+  - onImportBegan
+translation_of: Mozilla/Add-ons/WebExtensions/API/bookmarks/onImportBegan
+---
+<p>{{AddonSidebar()}}</p>
+
+<p>ブックマークのインポートが開始した際に発火します。</p>
+
+<p>ブックマークをインポートしている間、{{WebExtAPIRef("bookmarks.onCreated", "onCreated")}} が何度も発火する場合があります。<code>onCreated</code> に紐づけるリスナ関数の処理が重い場合には、<code>onImportBegan</code> と {{WebExtAPIRef("bookmarks.onImportEnded", "onImportEnded")}} をリッスンし、<code>onImportEnded</code>  が発火するまでは <code>onCreated</code> を無視してください。他のイベントは通常通り処理できます。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="brush: js">browser.bookmarks.onImportBegan.addListener(function() {...})
+browser.bookmarks.onImportBegan.removeListener(listener)
+browser.bookmarks.onImportBegan.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。この関数に渡される引数はありません。</p>
+ </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.onImportBegan")}}</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">handleImportBegan</span><span class="punctuation token">(</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">"Importing..."</span><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">handleImportEnded</span><span class="punctuation token">(</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">"...finished."</span><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>onImportBegan<span class="punctuation token">.</span><span class="function token">addListener</span><span class="punctuation token">(</span>handleImportBegan<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  chrome<span class="punctuation token">.</span>bookmarks<span class="punctuation token">.</span>onImportEnded<span class="punctuation token">.</span><span class="function token">addListener</span><span class="punctuation token">(</span>handleImportEnded<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>