The DedicatedWorkerGlobalScope
object (the Worker
global scope) is accessible through the self
keyword. Some additional global functions, namespaces objects, and constructors, not typically associated with the worker global scope, but available on it, are listed in the JavaScript Reference. See also: Functions available to workers.
Properties
This interface inherits properties from the WorkerGlobalScope
interface, and its parent EventTarget
, and therefore implements properties from WindowTimers
, WindowBase64
, and WindowEventHandlers
.
DedicatedWorkerGlobalScope.name
Read only- The name that the
Worker
was (optionally) given when it was created using theWorker()
constructor. This is mainly useful for debugging purposes.
Properties inherited from WorkerGlobalScope
WorkerGlobalScope.self
- Returns an object reference to the
DedicatedWorkerGlobalScope
object itself. WorkerGlobalScope.console
Read only- Returns the
Console
associated with the worker. WorkerGlobalScope.location
Read only- Returns the
WorkerLocation
associated with the worker.WorkerLocation
is a specific location object, mostly a subset of theLocation
for browsing scopes, but adapted to workers. WorkerGlobalScope.navigator
Read only- Returns the
WorkerNavigator
associated with the worker.WorkerNavigator
is a specific navigator object, mostly a subset of theNavigator
for browsing scopes, but adapted to workers. WorkerGlobalScope.performance
Read only- Returns the
Performance
object associated with the worker, which is a regular performance object, but with a subset of its properties and methods available.
Event handlers
This interface inherits event handlers from the WorkerGlobalScope
interface, and its parent EventTarget
, and therefore implements event handlers from WindowTimers
, WindowBase64
, and WindowEventHandlers
.
DedicatedWorkerGlobalScope.onmessage
- Is an
EventHandler
representing the code to be called when themessage
event is raised. These events are of typeMessageEvent
and will be called when the worker receives a message from the document that started it (i.e. from theWorker.postMessage
method.) DedicatedWorkerGlobalScope.onmessageerror
- Is an
EventHandler
representing the code to be called when themessageerror
event is raised.
Methods
This interface inherits methods from the WorkerGlobalScope
interface, and its parent EventTarget
, and therefore implements methods from WindowTimers
, WindowBase64
, and WindowEventHandlers
.
DedicatedWorkerGlobalScope.close()
- Discards any tasks queued in the
WorkerGlobalScope
's event loop, effectively closing this particular scope. DedicatedWorkerGlobalScope.postMessage()
- Sends a message — which can consist of
any
JavaScript object — to the parent document that first spawned the worker.
Inherited from WorkerGlobalScope
WorkerGlobalScope.dump()
- Writes a message to the console.
WorkerGlobalScope.importScripts()
- Imports one or more scripts into the worker's scope. You can specify as many as you'd like, separated by commas. For example:
importScripts('foo.js', 'bar.js');
Implemented from other places
WindowBase64.atob()
- Decodes a string of data which has been encoded using base-64 encoding.
WindowBase64.btoa()
- Creates a base-64 encoded ASCII string from a string of binary data.
WindowTimers.clearInterval()
- Cancels the repeated execution set using
WindowTimers.setInterval()
. WindowTimers.clearTimeout()
- Cancels the repeated execution set using
WindowTimers.setTimeout()
. WindowTimers.setInterval()
- Schedules the execution of a function every X milliseconds.
WindowTimers.setTimeout()
- Sets a delay for executing a function.
Events
message
- Fired when the worker receives a message from its parent.
Also available via theonmessage
property. messageerror
- Fired when a worker receives a message that can't be deserialized.
Also available via theonmessageerror
property.
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'DedicatedWorkerGlobalScope' in that specification. |
Living Standard |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
DedicatedWorkerGlobalScope | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.5 | IE Full support 10 | Opera Full support 10.6 | Safari Full support 4 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 11 | Safari iOS Full support 5.1 | Samsung Internet Android Full support 1.0 |
close | Chrome Full support Yes | Edge Full support ≤79 | Firefox Full support 54 | IE ? | Opera Full support Yes | Safari ? | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 54 | Opera Android Full support Yes | Safari iOS ? | Samsung Internet Android Full support Yes |
message event | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.5 | IE Full support 10 | Opera Full support 10.6 | Safari Full support 4 | WebView Android Full support 37 | Chrome Android Full support Yes | Firefox Android Full support 4 | Opera Android Full support 11.5 | Safari iOS Full support 5.1 | Samsung Internet Android Full support Yes |
messageerror event | Chrome Full support 60 | Edge Full support ≤79 | Firefox Full support 57 | IE ? | Opera Full support 47 | Safari ? | WebView Android Full support 60 | Chrome Android Full support 60 | Firefox Android Full support 57 | Opera Android Full support 47 | Safari iOS ? | Samsung Internet Android Full support 8.0 |
name | Chrome Full support Yes | Edge Full support ≤79 | Firefox Full support 55 | IE No support No | Opera ? | Safari No support No | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 55 | Opera Android ? | Safari iOS No support No | Samsung Internet Android Full support Yes |
onmessage | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.5 | IE Full support 10 | Opera Full support 10.6 | Safari Full support 4 | WebView Android Full support 37 | Chrome Android Full support Yes | Firefox Android Full support 4 | Opera Android Full support 11 | Safari iOS Full support 5.1 | Samsung Internet Android Full support Yes |
onmessageerror | Chrome Full support 60 | Edge Full support ≤79 | Firefox Full support 57 | IE ? | Opera Full support 47 | Safari ? | WebView Android Full support 60 | Chrome Android Full support 60 | Firefox Android Full support 57 | Opera Android Full support 44 | Safari iOS ? | Samsung Internet Android Full support 8.0 |
postMessage | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.5 | IE Full support 10 | Opera Full support 10.6 | Safari Full support 4 | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 4 | Opera Android Full support 11 | Safari iOS Full support 5.1 | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown