The connect
event is fired in shared workers at their SharedWorkerGlobalScope
when a new client connects.
This event is not cancelable and does not bubble.
The connect
event is fired in shared workers at their SharedWorkerGlobalScope
when a new client connects.
This event is not cancelable and does not bubble.
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("connect", (event) => {}); onconnect = (event) => {};
A MessageEvent
. Inherits from Event
.
This interface also inherits properties from its parent, Event
.
MessageEvent.data
Read only
The data sent by the message emitter.
MessageEvent.origin
Read only
A string representing the origin of the message emitter.
MessageEvent.lastEventId
Read only
A string representing a unique ID for the event.
MessageEvent.source
Read only
A MessageEventSource
(which can be a WindowProxy, MessagePort
, or ServiceWorker
object) representing the message emitter.
MessageEvent.ports
Read only
An array of MessagePort
objects representing the ports associated with the channel the message is being sent through (where appropriate, e.g. in channel messaging or when sending a message to a shared worker).
This example shows a shared worker file — when a connection to the worker occurs from a main thread via a MessagePort
, the onconnect
event handler fires. The event object is a MessageEvent
.
The connecting port can be referenced through the event object's ports
parameter; this reference can have an onmessage
handler attached to it to handle messages coming in through the port, and its postMessage()
method can be used to send messages back to the main thread using the worker.
js
self.onconnect = (e) => { const port = e.ports[0]; port.onmessage = (e) => { const workerResult = `Result: ${e.data[0] * e.data[1]}`; port.postMessage(workerResult); }; port.start(); };
For a complete running example, see our Basic shared worker example (run shared worker.)
You could also set up an event handler using the addEventListener()
method:
js
self.addEventListener("connect", (e) => { const port = e.ports[0]; port.onmessage = (e) => { const workerResult = `Result: ${e.data[0] * e.data[1]}`; port.postMessage(workerResult); }; });
Specification |
---|
HTML Standard # event-workerglobalscope-connect |
HTML Standard # handler-sharedworkerglobalscope-onconnect |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
connect_event |
4 | 79 | 29Before version 65 thedata property of the event object was null ; it is now initialized to an empty string, as per spec. |
No | 10.6 | 165–7 | ≤37 | 18 | 29Before version 65 thedata property of the event object was null ; it is now initialized to an empty string, as per spec. |
11 | 165–7 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/SharedWorkerGlobalScope/connect_event