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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: 'VideoTrackList: change イベント'
+slug: Web/API/VideoTrackList/change_event
+tags:
+ - API
+ - Change
+ - Reference
+ - events
+translation_of: Web/API/VideoTrackList/change_event
+---
+<div>{{APIRef}}</div>
+
+<p><span class="seoSummary"><code>change</code> イベントは、動画トラックがアクティブまたは非アクティブになったとき(トラックの <code><a href="/ja/docs/Web/API/VideoTrack/selected">selected</a></code> プロパティを変更したときなど)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("Event")}}</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/onchange">onchange</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('change', (event) =&gt; {
+ console.log(`'${event.type}' イベント発生`);
+});
+
+// `selected` の値を変更すると `change` イベントを引き起こします
+const toggleTrackButton = document.querySelector('.toggle-track');
+toggleTrackButton.addEventListener('click', () =&gt; {
+ const track = videoElement.videoTracks[0];
+ track.selected = !track.selected;
+});
+</pre>
+
+<p><code>onchange</code> イベントハンドラプロパティを使用する場合</p>
+
+<pre class="brush: js">const videoElement = document.querySelector('video');
+videoElement.videoTracks.onchange = (event) =&gt; {
+ console.log(`'${event.type}' イベント発生`);
+};
+
+// `selected` の値を変更すると `change` イベントを引き起こします
+const toggleTrackButton = document.querySelector('.toggle-track');
+toggleTrackButton.addEventListener('click', () =&gt; {
+ const track = videoElement.videoTracks[0];
+ track.selected = !track.selected;
+});</pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">仕様</th>
+ <th scope="col">状態</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', 'media.html#event-media-change', 'change')}}</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.change_event")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>Related events: <code><a href="/ja/docs/Web/API/VideoTrackList/addtrack_event">addtrack</a></code>, <code><a href="/ja/docs/Web/API/VideoTrackList/removetrack_event">removetrack</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/change_event">change</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>