The FetchEvent()
constructor creates a new FetchEvent
object.
Syntax
var fetchEvent = new FetchEvent(type, init);
Parameters
type
- A
DOMString
object specifying which event the object represents. This is alwaysfetch
for Fetch events. init
Optional-
An object conforming to the
FetchEventInit
dictionary, containing options to apply to the event object. Options are as follows:clientId
Read only- The
Client
that the current service worker is controlling. isReload
Read only- A
Boolean
that signifies whether the page was reloaded or not when the event was dispatched.true
if yes, andfalse
if not. Typically, pressing the refresh button in a browser is a reload, while clicking a link and pressing the back button is not. If not present, it defaults tofalse
. preloadResponse
Read only- A
Promise
which returns a previously-loaded response to the client. replacesClientId
Read only- A
DOMString
which identifies the client which is being replaced byresultingClientId
. resultingClientId
Read only- A
DOMString
containing the newclientId
if the client changes as a result of the page load. request
Read only- The
Request
object that would have triggered the event handler.
Specifications
Specification | Status | Comment |
---|---|---|
Service Workers The definition of 'FetchEvent() constructor' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
FetchEvent() constructor | Chrome Full support 40 | Edge Full support ≤18 | Firefox
Full support
44
| IE No support No | Opera Full support 27 | Safari No support No | WebView Android Full support 40 | Chrome Android Full support 40 | Firefox Android Full support 44 | Opera Android Full support 27 | Safari iOS No support No | Samsung Internet Android Full support 4.0 |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- See implementation notes.