MessageEvent: ports property

Available in 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

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

Browser compatibility

See also

• ExtendableMessageEvent — similar to this interface but used in interfaces that needs to give more flexibility to authors.