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: 'VideoTrackList: addtrack イベント'
+slug: Web/API/VideoTrackList/addtrack_event
+tags:
+  - API
+  - Reference
+  - addTrack
+  - events
+translation_of: Web/API/VideoTrackList/addtrack_event
+---
+<div>{{APIRef}}</div>
+
+<p><span class="seoSummary"><code>addtrack</code> イベントは、トラックが {{domxref("VideoTrackList")}} に追加されたときに発生します。</span></p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">バブリング</th>
+   <td>なし</td>
+  </tr>
+  <tr>
+   <th scope="row">キャンセル</th>
+   <td>不可</td>
+  </tr>
+  <tr>
+   <th scope="row">インターフェイス</th>
+   <td>{{domxref("TrackEvent")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">イベントハンドラプロパティ</th>
+   <td><code><a href="/ja/docs/Web/API/VideoTrackList/onaddtrack">onaddtrack</a></code></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<p><code>AddEventListener()</code> を使用する場合</p>
+
+<pre class="brush: js">const videoElement = document.querySelector('video');
+
+videoElement.videoTracks.addEventListener('addtrack', (event) =&gt; {
+  console.log(`Video track: ${event.track.label} added`);
+});</pre>
+
+<p><code>onaddtrack</code> イベントハンドラプロパティを使用する場合</p>
+
+<pre class="brush: js">const videoElement = document.querySelector('video');
+
+videoElement.videoTracks.onaddtrack = (event) =&gt; {
+  console.log(`Video track: ${event.track.label} added`);
+};</pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <td>仕様</td>
+   <th scope="col">状態</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', 'media.html#event-media-addtrack', 'addtrack')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("api.VideoTrackList.addtrack_event")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>関連イベント: <code><a href="/ja/docs/Web/API/VideoTrackList/removetrack_event">removetrack</a></code>, <code><a href="/ja/docs/Web/API/VideoTrackList/change_event">change</a></code></li>
+ <li><code><a href="/ja/docs/Web/API/AudioTrackList">AudioTrackList</a></code> 対象でのこのイベント: <code><a href="/ja/docs/Web/API/AudioTrackList/addtrack_event">addtrack</a></code></li>
+ <li><code><a href="/ja/docs/Web/API/MediaStream">MediaStream</a></code> 対象でのこのイベント: <code><a href="/ja/docs/Web/API/MediaStream/addtrack_event">addtrack</a></code></li>
+ <li><a href="/ja/docs/Web/API/Media_Streams_API">Media Streams API</a></li>
+ <li><a href="/ja/docs/Web/API/WebRTC_API">WebRTC API</a></li>
+</ul>
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