BroadcastChannel

The BroadcastChannel interface represents a named channel that any browsing context of a given origin can subscribe to. It allows communication between different documents (in different windows, tabs, frames or iframes) of the same origin. Messages are broadcasted via a message event fired at all BroadcastChannel objects listening to the channel.

Constructor

BroadcastChannel()

Creates an object linking to the named channel.

Properties

This interface also inherits properties from its parent, EventTarget.

BroadcastChannel.name

Returns a DOMString, the name of the channel.

BroadcastChannel.onmessage

Is an EventHandler property that specifies the function to execute when a message event is fired on this object.

Methods

This interface also inherits methods from its parent, EventTarget.

BroadcastChannel.postMessage()

Sends the message, of any type of object, to each BroadcastChannel object listening to the same channel.

BroadcastChannel.close()

Closes the channel object, indicating it won't get any new messages, and allowing it to be, eventually, garbage collected.

Specifications

Specification	Status	Comment
WHATWG HTML Living Standard The definition of 'BroadcastChannel' in that specification.	Living Standard	Initial definition.

Browser compatibility

See also

• Another, more heavyweight, way of communicating between browser contexts: ServiceWorker.
• Broadcast Channel API overview