MessagePort.postMessage()

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O método postMessage() da interface MessagePort envia uma mensagem da porta e opcionalmente transfere a propriedade do objeto para outros contexto de navegação.

Note: This feature is available in Web Workers.

Syntax

port.postMessage(message, transferList);

Returns

Vazio.

Parameters

message
A mensagem que você quer enviar atravéz do canal. Esta mensagem pode ser de qualquer tipo de dados basico. Multiplos items podem ser enviados com diferentestes tipos de dados como em um Array.
transferList Optional
Transferable objects to be transferred — these objects have their ownership transferred to the receiving browsing context, so are no longer usable by the sending browsing context.

Example

In the following code block, you can see a new channel being created using the MessageChannel.MessageChannel constructor. When the IFrame has loaded, we pass MessageChannel.port2 to the IFrame using window.postMessage along with a message. The handleMessage handler then responds to a message being sent back from the IFrame using onmessage, putting it into a paragraph — MessageChannel.port1 is listened to, to check when the message arrives.

var channel = new MessageChannel();
var para = document.querySelector('p');
    
var ifr = document.querySelector('iframe');
var otherWindow = ifr.contentWindow;

ifr.addEventListener("load", iframeLoaded, false);
    
function iframeLoaded() {
  otherWindow.postMessage('Hello from the main page!', '*', [channel.port2]);
}

channel.port1.onmessage = handleMessage;
function handleMessage(e) {
  para.innerHTML = e.data;
}   

For a full working example, see our channel messaging basic demo on Github (run it live too).

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'postMessage()' in that specification.
Padrão em tempo real

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
postMessageChrome Full support 4Edge Full support 12Firefox Full support YesIE Full support 10Opera Full support 10.6Safari Full support 5WebView Android Full support YesChrome Android Full support 18Firefox Android No support NoOpera Android Full support 11Safari iOS Full support 5.1Samsung Internet Android Full support 1.0

Legend

Full support  
Full support
No support  
No support

See also