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The tag read-only property of the PeriodicSyncEvent interface returns the developer-defined identifier for the PeriodicSyncEvent. This is specified when calling the PeriodicSyncManager.register() method of the PeriodicSyncManager interface. Multiple tags can be used by the web app to run different periodic tasks at different frequencies.
Syntax
const tag = PeriodicSyncEvent.tag;
Value
Returns a String of the defined identifier.
Examples
The following example demonstrates listening for a periodic sync event in the service worker, and accessing the tag property.
self.addEventListener('periodicsync', event => {
console.log(event.tag); // logs the events tag
});Specifications
| Specification | Status | Comment |
| Web Periodic Background SynchronizationThe definition of 'tag' in that specification. | Working Draft | Initial definition. |
Browser compatibility
The compatibility table in 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.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
Chrome
Full support 80 |
Edge
Full support 80 |
Firefox
No support No |
IE
No support No |
Opera
Full support 67 |
Safari
No support No |
WebView Android
Full support 80 |
Chrome Android
Full support 80 |
Firefox Android
No support No |
Opera Android
Full support 57 |
Safari iOS
No support No |
Samsung Internet Android
Full support 13.0 |
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.
- Non-standard. Expect poor cross-browser support.'
- Non-standard. Expect poor cross-browser support.
See also
- Richer offline experiences with the Periodic Background Sync API
- A Periodic Background Sync demo app
PeriodicSyncEvent.tag by Mozilla Contributors is licensed under CC-BY-SA 2.5.
