theme.onUpdated
Fires when a theme supplied as a browser extension is applied or removed. Specifically:
- when a static theme is installed
- when a dynamic theme calls
theme.update()
ortheme.reset()
- when a theme gets uninstalled.
Note that this event is not fired for changes to the built-in themes.
Syntax
js
browser.theme.onUpdated.addListener(listener)
browser.theme.onUpdated.removeListener(listener)
browser.theme.onUpdated.hasListener(listener)
Events have three functions:
addListener(listener)
-
Adds a listener to this event.
removeListener(listener)
-
Stop listening to this event. The
listener
argument is the listener to remove. hasListener(listener)
-
Check whether
listener
is registered for this event. Returnstrue
if it is listening,false
otherwise.
addListener syntax
Parameters
listener
-
The function called when this event occurs. The function is passed these arguments:
updateInfo
-
object
. An object containing two properties:theme
-
object
. If the event fired because an extension-supplied theme was removed, this will be an empty object. If it fired because an extension-supplied theme was applied, then it will be atheme.Theme
object representing the theme that was applied. windowId
Optional-
integer
. The ID of the window for which theme has been updated. If this property is not present, it means that the theme was updated globally.
Browser compatibility
BCD tables only load in the browser
Examples
js
function handleUpdated(updateInfo) {
if (updateInfo.theme.colors) {
console.log(`Theme was applied: ${updateInfo.theme}`);
} else {
console.log(`Theme was removed`);
}
}
browser.theme.onUpdated.addListener(handleUpdated);