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Creates a new alarm.
Syntax
chrome.alarms.create( name, // optional string alarmInfo // optional object )
This API is also available as browser.alarms.create()
.
Parameters
name
Optionalstring
. A name for the alarm. Defaults to the empty string.- This can be used to refer to a particular alarm in
alarms.get()
andalarms.clear()
. It will also be available inalarms.onAlarm
as thename
property of thealarms.Alarm
object passed into the listener function. - Alarm names are always unique (within the scope of a single add-on). If the name given here matches the name of an existing alarm created by this add-on, then the existing alarm is removed and won't fire.
alarmInfo
Optional-
object
. You can use this to specify when the alarm will initially fire, either as an absolute value (when
), or as a delay from the time the alarm is set (delayInMinutes
). To make the alarm recur, specifyperiodInMinutes
.On Chrome, unless the add-on is loaded unpackaged, alarms it creates are not allowed to fire more than once per minute. If an add-on tries to set
delayInMinutes
to a value < 1, orwhen
to a value < 1 minute in the future, then the alarm will fire after 1 minute. If an add-on tries to setperiodInMinutes
to a value < 1, then the alarm will fire every minute.The
alarmInfo
object may contain the following properties: -
when
Optionaldouble
. The time the alarm will fire first, given as milliseconds since the epoch. To get the number of milliseconds between the epoch and the current time, useDate.now()
. If you specifywhen
, don't specifydelayInMinutes
.delayInMinutes
Optionaldouble
. The time the alarm will fire first, given as minutes from the time the alarm is set. If you specifydelayInMinutes
, don't specifywhen
.periodInMinutes
Optionaldouble
. If this is specified, the alarm will fire again everyperiodInMinutes
after its initial firing. If you specify this value you may omit bothwhen
anddelayInMinutes
, and the alarm will then fire initially afterperiodInMinutes
. IfperiodInMinutes
is not specified, the alarm will only fire once.
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.
Chrome | Edge | Firefox | Firefox for Android | Opera | |
---|---|---|---|---|---|
Basic support | Yes | No | 45.0 | 48.0 | 33 |
Examples
Create a one-time delay-based alarm with "" for the name:
const delayInMinutes = 5; chrome.alarms.create({ delayInMinutes });
Create a periodic delay-based alarm named "my-periodic-alarm":
const delayInMinutes = 5; const periodInMinutes = 2; chrome.alarms.create("my-periodic-alarm", { delayInMinutes, periodInMinutes });
Create a periodic absolute alarm named "my-periodic-alarm":
const when = 1545696000; const periodInMinutes = 2; chrome.alarms.create("my-periodic-alarm", { when, periodInMinutes });
This API is based on Chromium's chrome.alarms
API.
Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.
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