MessageEvent: ports property
The ports read-only property of the
MessageEvent interface is an array of MessagePort objects
representing the ports associated with the channel the message is being sent through
(where appropriate, e.g. in channel messaging or when sending a message to a shared
worker).
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
| desktop | mobile | server | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ports | |||||||||||||
See also
-
ExtendableMessageEvent— similar to this interface but used in interfaces that needs to give more flexibility to authors.