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---
title: EventSource.onopen
slug: Web/API/EventSource/onopen
translation_of: Web/API/EventSource/onopen
---
<div>{{APIRef('WebSockets API')}}</div>
<p>La propiedad <code><strong>onopen</strong></code> de la interfaz {{domxref("EventSource")}} es un {{domxref("EventHandler")}} llamado cuando un evento {{event("open")}} es recibido, esto pasa cuando la conexión fue solo abierta.</p>
<h2 id="Syntax">Syntax</h2>
<pre class="syntaxbox">eventSource.onopen = function</pre>
<h2 id="Ejemplos">Ejemplos</h2>
<pre class="brush: js">evtSource.onopen = function() {
console.log("Connection to server opened.");
};</pre>
<div class="note">
<p><strong>Nota</strong>: Tu puedes encontrar un ejemplo completo en GitHub — ve <a href="https://github.com/mdn/dom-examples/tree/master/server-sent-events">Simple SSE demo using PHP.</a></p>
</div>
<h2 id="Especificaciones">Especificaciones</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Especificación</th>
<th scope="col">Estado</th>
<th scope="col">Comentario</th>
</tr>
<tr>
<td>{{SpecName('HTML WHATWG', "comms.html#handler-eventsource-onopen", "onopen")}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td>Initial definition</td>
</tr>
</tbody>
</table>
<ul>
</ul>
<h2 id="Compatibilidad_con_navegadores">Compatibilidad con navegadores</h2>
<div>{{CompatibilityTable}}</div>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Caracteristica</th>
<th>Chrome</th>
<th>Edge</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>EventSource support</td>
<td>6</td>
<td>{{CompatNo}}</td>
<td>{{CompatGeckoDesktop("6.0")}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>5</td>
</tr>
<tr>
<td>Available in shared and dedicated workers<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>
<table class="compat-table">
<tbody>
<tr>
<th>Caracteristica</th>
</tr>
</tbody>
</table>
</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>EventSource support</td>
<td>4.4</td>
<td>45</td>
<td>{{CompatNo}}</td>
<td>12</td>
<td>4.1</td>
</tr>
<tr>
<td>Available in shared and dedicated workers<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] But <a href="https://github.com/w3c/ServiceWorker/issues/947">not service workers as yet</a>.</p>
<h2 id="Mira_también">Mira también</h2>
<ul>
<li>{{domxref("EventSource")}}</li>
</ul>
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