Interface MessagePort

This Channel Messaging API interface represents one of the two ports of a MessageChannel, allowing messages to be sent from one port and listening out for them arriving at the other.

MDN Reference

Hierarchy

Properties

onmessage onmessageerror

Methods

addEventListener close dispatchEvent postMessage removeEventListener start

Properties

onmessage

onmessage: ((this, ev) => any)

Type declaration

onmessageerror

onmessageerror: ((this, ev) => any)

Type declaration

Methods

addEventListener

close

  • Disconnects the port, so that it is no longer active.

    MDN Reference

    Returns void

dispatchEvent

  • Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.

    MDN Reference

    Parameters

    Returns boolean

postMessage

  • Posts a message through the channel. Objects listed in transfer are transferred, not just cloned, meaning that they are no longer usable on the sending side.

    Throws a "DataCloneError" DOMException if transfer contains duplicate objects or port, or if message could not be cloned.

    MDN Reference

    Parameters

    Returns void

  • Parameters

    Returns void

removeEventListener

start

  • Begins dispatching messages received on the port.

    MDN Reference

    Returns void

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