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authorPeter Bengtsson <mail@peterbe.com>2021-07-15 13:42:10 -0400
committerGitHub <noreply@github.com>2021-07-15 13:42:10 -0400
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----
-title: Worker.postMessage()
-slug: Web/API/Worker/postMessage
-translation_of: Web/API/Worker/postMessage
----
-<p>{{APIRef("Web Workers API")}}</p>
-
-<p><a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API">Web Workers API</a> posee un metodo llamado <code><strong>postMessage()</strong></code> el cual envia un mensaje al ambito del worker. Este metodo acepta un parametro, el cual es un dato enviado al worker. El dato puede ser un valor o objeto controlado por el algoritmo strctured clone (incluye referencias ciclicas).</p>
-
-<p>El Worker puede enviar de vuelta información al hilo que lo genero usando el metodo {{domxref("DedicatedWorkerGlobalScope.postMessage")}}.</p>
-
-<h2 id="Syntax">Syntax</h2>
-
-<pre class="brush: js">myWorker.postMessage(aMessage, transferList);</pre>
-
-<h3 id="Parameters">Parameters</h3>
-
-<dl>
- <dt><em>aMessage</em></dt>
- <dd>The object to deliver to the worker; this will be in the data field in the event delivered to the {{domxref("DedicatedWorkerGlobalScope.onmessage")}} handler. This may be any value or JavaScript object handled by the <a href="/en-US/docs/Web/Guide/DOM/The_structured_clone_algorithm" title="http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#transferable">structured clone</a> algorithm, which includes cyclical references.</dd>
- <dt><em>transferList</em> {{optional_inline}}</dt>
- <dd>An optional <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array" title="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array">array</a> of {{domxref("Transferable")}} objects to transfer ownership of. If the ownership of an object is transferred, it becomes unusable (<em>neutered</em>) in the context it was sent from and it becomes available only to the worker it was sent to.</dd>
- <dd>Only {{domxref("MessagePort")}} and {{domxref("ArrayBuffer")}} objects can be transferred.</dd>
-</dl>
-
-<h3 id="Returns">Returns</h3>
-
-<p>Void.</p>
-
-<h2 id="Example">Example</h2>
-
-<p>The following code snippet shows creation of a {{domxref("Worker")}} object using the {{domxref("Worker.Worker", "Worker()")}} constructor. When either of two form inputs (<code>first</code> and <code>second</code>) have their values changed, {{event("change")}} events invoke <code>postMessage()</code> to send the value of both inputs to the current worker.</p>
-
-<pre class="brush: js">var myWorker = new Worker("worker.js");
-
-first.onchange = function() {
- myWorker.postMessage([first.value,second.value]);
- console.log('Message posted to worker');
-}
-
-second.onchange = function() {
-  myWorker.postMessage([first.value,second.value]);
-  console.log('Message posted to worker');
-}
-</pre>
-
-<p>For a full example, see our<a class="external external-icon" href="https://github.com/mdn/simple-web-worker">Basic dedicated worker example</a> (<a class="external external-icon" dir="ltr" href="mailto:aguilahorus@gmail.com">run dedicated worker</a>).</p>
-
-<div class="note">
-<p><strong>Note</strong>: <code>postMessage()</code> can only send a single object at once. As seen above, if you want to pass multiple values you can send an array.</p>
-</div>
-
-<h2 id="Transfer_Example">Transfer Example</h2>
-
-<p>This example is of a Firefox addon that transfers an ArrayBuffer from the main thread to the ChromeWorker, and then the ChromeWorker trasnfers it back to the main thread.</p>
-
-<h4 id="Main_thread_code">Main thread code:</h4>
-
-<pre class="brush: js">var myWorker = new ChromeWorker(self.path + 'myWorker.js');
-
-function handleMessageFromWorker(msg) {
- console.log('incoming message from worker, msg:', msg);
- switch (msg.data.aTopic) {
- case 'do_sendMainArrBuff':
- sendMainArrBuff(msg.data.aBuf)
- break;
- default:
- throw 'no aTopic on incoming message to ChromeWorker';
- }
-}
-
-myWorker.addEventListener('message', handleMessageFromWorker);
-
-// Ok lets create the buffer and send it
-var arrBuf = new ArrayBuffer(8);
-console.info('arrBuf.byteLength pre transfer:', arrBuf.byteLength);
-
-myWorker.postMessage(
-    {
-        aTopic: 'do_sendWorkerArrBuff',
-        aBuf: arrBuf // The array buffer that we passed to the transferrable section 3 lines below
-    },
-    [
-        arrBuf // The array buffer we created 9 lines above
-    ]
-);
-
-console.info('arrBuf.byteLength post transfer:', arrBuf.byteLength);
-</pre>
-
-<h4 id="Worker_code">Worker code</h4>
-
-<pre class="brush: js">self.onmessage = function (msg) {
-    switch (msg.data.aTopic) {
-        case 'do_sendWorkerArrBuff':
-                sendWorkerArrBuff(msg.data.aBuf)
-            break;
-        default:
-            throw 'no aTopic on incoming message to ChromeWorker';
-    }
-}
-
-function sendWorkerArrBuff(aBuf) {
-    console.info('from worker, PRE send back aBuf.byteLength:', aBuf.byteLength);
-
-    self.postMessage({aTopic:'do_sendMainArrBuff', aBuf:aBuf}, [aBuf]);
-
-    console.info('from worker, POST send back aBuf.byteLength:', aBuf.byteLength);
-}
-</pre>
-
-<h4 id="Output_logged">Output logged</h4>
-
-<pre>arrBuf.byteLength pre transfer: 8 bootstrap.js:40
-arrBuf.byteLength post transfer: 0 bootstrap.js:42
-
-from worker, PRE send back aBuf.byteLength: 8 myWorker.js:5:2
-
-incoming message from worker, msg: message { ... } bootstrap.js:20
-got back buf in main thread, aBuf.byteLength: 8 bootstrap.js:12
-
-from worker, POST send back aBuf.byteLength: 0 myWorker.js:7:2</pre>
-
-<p>We see that byteLength goes to 0 as it is trasnferred. To see a fully working example of this Firefox demo addon see here: <a href="https://github.com/Noitidart/ChromeWorker/tree/aca57d9cadc4e68af16201bdecbfb6f9a6f9ca6b">GitHub :: ChromeWorker - demo-transfer-arraybuffer</a></p>
-
-<h2 id="Specifications">Specifications</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('HTML WHATWG', "#dom-worker-postmessage", "Worker.postMessage()")}}</td>
- <td>{{Spec2('HTML WHATWG')}}</td>
- <td>No change from {{SpecName("Web Workers")}}.</td>
- </tr>
- <tr>
- <td>{{SpecName('Web Workers', "#dom-worker-postmessage", "Worker.postMessage()")}}</td>
- <td>{{Spec2('Web Workers')}}</td>
- <td>Initial definition.</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-<div>{{CompatibilityTable}}</div>
-
-<div id="compat-desktop">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</th>
- <th>Chrome</th>
- <th>Firefox (Gecko)</th>
- <th>Internet Explorer</th>
- <th>Opera</th>
- <th>Safari (WebKit)</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>10.0 [1]</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>Firefox OS (Gecko)</th>
- <th>IE Phone</th>
- <th>Opera Mobile</th>
- <th>Safari Mobile</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>10.0 [1]</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<p>[1] Internet Explorer does not support {{domxref("Transferable")}} objects.</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li>The {{domxref("Worker")}} interface it belongs to.</li>
-</ul>