---
title: 'Document: selectstart event'
slug: Web/API/Document/selectstart_event
translation_of: Web/API/Document/selectstart_event
---
<div>{{APIRef}}</div>

<div>
<p><a href="/en-US/docs/Web/API/Selection">Selection API</a> の <code><strong>selectstart</strong></code> イベントは新しい選択範囲をユーザが指定した際に発火します。</p>

<p>イベントがキャンセルされた場合、選択範囲は変更されません。</p>
</div>

<table class="properties">
 <tbody>
  <tr>
   <th>Bubbles</th>
   <td>有効</td>
  </tr>
  <tr>
   <th>Cancelable</th>
   <td>有効</td>
  </tr>
  <tr>
   <th>Interface</th>
   <td>{{domxref("Event")}}</td>
  </tr>
  <tr>
   <th>Event handler property</th>
   <td>{{domxref("GlobalEventHandlers.onselectstart", "onselectstart")}}</td>
  </tr>
 </tbody>
</table>

<h2 id="例">例</h2>

<pre class="brush: js">// addEventListener version
document.addEventListener('selectstart', () =&gt; {
  console.log('Selection started');
});

// onselectstart version
document.onselectstart = () =&gt; {
  console.log('Selection changed.');
};
</pre>

<h2 id="仕様">仕様</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('Selection API', '#selectstart-event', 'selectstart')}}</td>
   <td>{{Spec2('Selection API')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="ブラウザ互換性">ブラウザ互換性</h2>

<p>{{Compat("api.Document.selectstart_event")}}</p>

<h2 id="参照">参照</h2>

<ul>
 <li>{{domxref("Document/selectionchange_event", "selectionchange")}}</li>
</ul>