Fired when one or more items change.
browser.storage.onChanged.addListener(callback) browser.storage.onChanged.removeListener(listener) browser.storage.onChanged.hasListener(listener)
Events have three functions:
addListener(callback)
removeListener(listener)
listener
argument is the listener to remove.hasListener(listener)
listener
is registered for this event. Returns true
if it is listening, false
otherwise.callback
Function that will be called when this event occurs. The function will be passed the following arguments:
changes
object
. Object describing the change. This contains one property for each key that changed. The name of the property is the name of the key that changed, and its value is a storage.StorageChange
object describing the change to that item.areaName
string
. The name of the storage area ("sync"
, "local"
, or "managed"
) to which the changes were made.Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onChanged |
Yes |
14 |
45 |
? |
Yes |
14 |
? |
? |
48 |
? |
? |
? |
/* Log the storage area that changed, then for each item changed, log its old value and its new value. */ function logStorageChange(changes, area) { console.log("Change in storage area: " + area); let changedItems = Object.keys(changes); for (let item of changedItems) { console.log(item + " has changed:"); console.log("Old value: "); console.log(changes[item].oldValue); console.log("New value: "); console.log(changes[item].newValue); } } browser.storage.onChanged.addListener(logStorageChange);
Note: This API is based on Chromium's chrome.storage
API. This documentation is derived from storage.json
in the Chromium code.
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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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/onChanged