The ExtendableMessageEvent interface of the ServiceWorker API represents the event object of a message event fired on a service worker (when a channel message is received on the ServiceWorkerGlobalScope from another context) — extends the lifetime of such events.
Documentation ExtendableMessageEvent by Mozilla Contributors, licensed under CC-BY-SA 2.5.
See also:
Constructor
Variables
Returns the event's data. It can be any data type.
Represents, in server-sent events, the last event ID of the event source.
Returns the origin of the ServiceWorkerClient that sent the message
Returns the array containing the MessagePort objects representing the ports of the associated message channel.
Returns a reference to the service worker that sent the message.
Inherited Variables
Defined by Event
A Boolean indicating whether the event bubbles up through the DOM or not.
A Boolean indicating whether the event is cancelable.
A reference to the currently registered target for the event. This is the object to which the event is currently slated to be sent to; it's possible this has been changed along the way through retargeting.
Indicates whether or not event.preventDefault() has been called on the event.
Indicates which phase of the event flow is being processed.
The explicit original target of the event (Mozilla-specific).
Indicates whether or not the event was initiated by the browser (after a user click for instance) or by a script (using an event creation method, like event.initEvent)
The original target of the event, before any retargetings (Mozilla-specific).
A reference to the target to which the event was originally dispatched.
The time at which the event was created, in milliseconds. By specification, this value is time since epoch, but in reality browsers' definitions vary; in addition, work is underway to change this to be a DOMHighResTimeStamp instead.
The name of the event (case-insensitive).
Inherited Methods
Defined by Event
Initializes the value of an Event created. If the event has already being dispatched, this method does nothing.
Cancels the event (if it is cancelable).
For this particular event, no other listener will be called. Neither those attached on the same element, nor those attached on elements which will be traversed later (in capture phase, for instance)
Stops the propagation of events further along in the DOM.