MessageEvent: ports property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
The ports read-only property of the
MessageEvent interface is an array of MessagePort objects
containing all MessagePort objects sent with the message, in order.
Value
An array of MessagePort objects.
Examples
js
onconnect = (e) => {
const port = e.ports[0];
port.addEventListener("message", (e) => {
const workerResult = `Result: ${e.data[0] * e.data[1]}`;
port.postMessage(workerResult);
});
port.start(); // Required when using addEventListener. Otherwise called implicitly by onmessage setter.
};
Specifications
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| HTML # dom-messageevent-ports-dev |
Browser compatibility
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
See also
ExtendableMessageEvent— similar to this interface but used in interfaces that needs to give more flexibility to authors.