---
title: EventSource.onerror
slug: Web/API/EventSource/onerror
translation_of: Web/API/EventSource/onerror
---
<div>{{APIRef('WebSockets API')}}</div>

<div> </div>

<p>A propriedade <code><strong>onerror</strong></code> da interface {{domxref("EventSource")}} é um {{domxref("EventHandler")}} chamado quando um erro ocorre e um evento {{event("error")}} é despachado para o objeto <code>EventSource</code>.</p>

<h2 id="Sintaxe">Sintaxe</h2>

<pre class="syntaxbox">eventSource.onerror = function</pre>

<h2 id="Exemplos">Exemplos</h2>

<pre class="brush: js">evtSource.onerror = function() {
  console.log("EventSource failed.");
};</pre>

<div class="note">
<p><strong>Nota</strong>: Você pode encontrar um exemplo completo no GitHub — veja <a href="https://github.com/mdn/dom-examples/tree/master/server-sent-events">Simple SSE demo using PHP.</a></p>
</div>

<h2 id="Especificações">Especificações</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Especificação</th>
   <th scope="col">Status</th>
   <th scope="col">Comentário</th>
  </tr>
  <tr>
   <td>{{SpecName('HTML WHATWG', "comms.html#handler-eventsource-onerror", "onerror")}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>Definição inicial</td>
  </tr>
 </tbody>
</table>

<ul>
</ul>

<h2 id="Compatibilidade_de_navegadores">Compatibilidade de navegadores</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Edge</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Suporte a EventSource</td>
   <td>6</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoDesktop("6.0")}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>5</td>
  </tr>
  <tr>
   <td>Disponibilidade em workers compartilhados e dedicados<sup>[1]</sup></td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatGeckoDesktop("53.0")}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Suporte a EventSource</td>
   <td>4.4</td>
   <td>45</td>
   <td>{{CompatNo}}</td>
   <td>12</td>
   <td>4.1</td>
  </tr>
  <tr>
   <td>Disponibilidade em workers compartilhados e dedicados<sup>[1]</sup></td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoMobile("53.0")}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] Mas <a href="https://github.com/w3c/ServiceWorker/issues/947">ainda não em service workers.</a></p>

<h2 id="Veja_também">Veja também</h2>

<ul>
 <li>{{domxref("EventSource")}}</li>
</ul>