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 September 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
Specification |
---|
HTML Standard # dom-messageevent-ports-dev |
Browser compatibility
BCD tables only load in the browser
See also
ExtendableMessageEvent
— similar to this interface but used in interfaces that needs to give more flexibility to authors.