From 4f0e1ec1c2772904c033f747dc38a08223e8d661 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Thu, 15 Jul 2021 13:42:10 -0400 Subject: delete pages that were never translated from en-US (es, part 2) (#1550) --- files/es/web/api/worker/postmessage/index.html | 206 ------------------------- 1 file changed, 206 deletions(-) delete mode 100644 files/es/web/api/worker/postmessage/index.html (limited to 'files/es/web/api/worker/postmessage') diff --git a/files/es/web/api/worker/postmessage/index.html b/files/es/web/api/worker/postmessage/index.html deleted file mode 100644 index c47fe400fc..0000000000 --- a/files/es/web/api/worker/postmessage/index.html +++ /dev/null @@ -1,206 +0,0 @@ ---- -title: Worker.postMessage() -slug: Web/API/Worker/postMessage -translation_of: Web/API/Worker/postMessage ---- -

{{APIRef("Web Workers API")}}

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Web Workers API posee un metodo llamado postMessage() 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).

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El Worker puede enviar de vuelta información al hilo que lo genero usando el metodo {{domxref("DedicatedWorkerGlobalScope.postMessage")}}.

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Syntax

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myWorker.postMessage(aMessage, transferList);
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Parameters

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aMessage
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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 structured clone algorithm, which includes cyclical references.
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transferList {{optional_inline}}
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An optional array of {{domxref("Transferable")}} objects to transfer ownership of. If the ownership of an object is transferred, it becomes unusable (neutered) in the context it was sent from and it becomes available only to the worker it was sent to.
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Only {{domxref("MessagePort")}} and {{domxref("ArrayBuffer")}} objects can be transferred.
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Returns

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Void.

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Example

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The following code snippet shows creation of a {{domxref("Worker")}} object using the {{domxref("Worker.Worker", "Worker()")}} constructor. When either of two form inputs (first and second) have their values changed, {{event("change")}} events invoke postMessage() to send the value of both inputs to the current worker.

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var myWorker = new Worker("worker.js");
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-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');
-}
-
- -

For a full example, see ourBasic dedicated worker example (run dedicated worker).

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-

Note: postMessage() can only send a single object at once. As seen above, if you want to pass multiple values you can send an array.

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Transfer Example

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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.

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Main thread code:

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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);
-
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Worker code

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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);
-}
-
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Output logged

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arrBuf.byteLength pre transfer: 8                              bootstrap.js:40
-arrBuf.byteLength post transfer: 0                             bootstrap.js:42
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-from worker, PRE send back aBuf.byteLength: 8                  myWorker.js:5:2
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-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
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We see that byteLength goes to 0 as it is trasnferred. To see a fully working example of this Firefox demo addon see here: GitHub :: ChromeWorker - demo-transfer-arraybuffer

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Specifications

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SpecificationStatusComment
{{SpecName('HTML WHATWG', "#dom-worker-postmessage", "Worker.postMessage()")}}{{Spec2('HTML WHATWG')}}No change from {{SpecName("Web Workers")}}.
{{SpecName('Web Workers', "#dom-worker-postmessage", "Worker.postMessage()")}}{{Spec2('Web Workers')}}Initial definition.
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Browser compatibility

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{{CompatibilityTable}}
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FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari (WebKit)
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}10.0 [1]{{CompatVersionUnknown}}{{CompatVersionUnknown}}
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- - - - - - - - - - - - - - - - - - - - - -
FeatureAndroidFirefox Mobile (Gecko)Firefox OS (Gecko)IE PhoneOpera MobileSafari Mobile
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}10.0 [1]{{CompatVersionUnknown}}{{CompatVersionUnknown}}
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[1] Internet Explorer does not support {{domxref("Transferable")}} objects.

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See also

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