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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.

Hierarchy

Index

Properties

EventTarget

EventTarget: { constructor: any; prototype: EventTarget }

Type declaration

onmessage

onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null

onmessageerror

onmessageerror: ((this: MessagePort, ev: MessageEvent) => any) | null

Methods

addEventListener

close

  • close(): void
  • Disconnects the port, so that it is no longer active.

    Returns void

dispatchEvent

  • dispatchEvent(event: Event): boolean
  • 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.

    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.

    Parameters

    Returns void

  • Parameters

    Returns void

removeEventListener

start

  • start(): void
  • Begins dispatching messages received on the port.

    Returns void

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