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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>