ExtendableMessageEvent: ExtendableMessageEvent() constructor
The ExtendableMessageEvent()
constructor creates a new ExtendableMessageEvent
object.
Syntax
js
new ExtendableMessageEvent(type)
new ExtendableMessageEvent(type, options)
Parameters
type
-
A string with the name of the event. It is case-sensitive and browsers set it to
messageerror
ormessage
. options
Optional-
An object that, in addition of the properties defined in
ExtendableEvent()
, can have the following properties:data
Optional-
The event's data; this can be any data type. It defaults to
null
. origin
Optional-
A string that defines the origin of the corresponding service worker's environment settings object. It defaults to
""
. lastEventId
Optional-
A string that defines the last event ID of the event source. It defaults to
""
. source
Optional-
The
Client
,ServiceWorker
orMessagePort
that sent the message. It defaults tonull
. ports
Optional-
An array containing the
MessagePort
objects connected to the channel sending the message. It defaults to an empty array.
Return value
A new ExtendableMessageEvent
object.
Examples
js
const options = {
data: "hello message",
source: MessagePortReference,
ports: MessagePortListReference,
};
const myEME = new ExtendableMessageEvent("message", init);
Specifications
Specification |
---|
Service Workers # dom-extendablemessageevent-extendablemessageevent |
Browser compatibility
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