---
title: WindowEventHandlers.onrejectionhandled
slug: Web/API/WindowEventHandlers/onrejectionhandled
tags:
  - API
  - Event Handler
  - HTML DOM
  - JavaScript
  - Promises
  - Property
  - Reference
  - WindowEventHandlers
  - events
  - onrejectionhandled
translation_of: Web/API/WindowEventHandlers/onrejectionhandled
---
<div>{{APIRef}}</div>

<p><span class="seoSummary">{{domxref("WindowEventHandlers")}} ミックスインの <strong><code>onrejectionhandled</code></strong> プロパティは、{{event("rejectionhandled")}} イベントを処理するための {{event("Event_handlers", "event handler")}} です。 このイベントは、{{jsxref("Promise")}} が拒否されたときに発生します。</span></p>

<h2 id="Syntax" name="Syntax">構文</h2>

<pre class="syntaxbox">window.addEventListener("rejectionhandled", function(event) { ... });
window.onrejectionhandled = function(event) { ...};</pre>

<h2 id="Example" name="Example">例</h2>

<pre class="brush: js">window.onrejectionhandled = function(e) {
  console.log(e.reason);
}</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>
   <th scope="col">コメント</th>
  </tr>
  <tr>
   <td>{{SpecName('HTML WHATWG', 'webappapis.html#handler-window-onrejectionhandled', 'onrejectionhandled')}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>初期定義</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>



<p>{{Compat("api.WindowEventHandlers.onrejectionhandled")}}</p>