Fired when a tab is zoomed.
Syntax
browser.tabs.onZoomChange.addListener(listener)
browser.tabs.onZoomChange.removeListener(listener)
browser.tabs.onZoomChange.hasListener(listener)
Events have three functions:
addListener(callback)
- 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
callback
-
Function that will be called when this event occurs. The function will be passed the following arguments:
ZoomChangeInfo
object
. Information about the zoom event.
Additional objects
ZoomChangeInfo
tabId
integer
. ID of the tab that was zoomed.oldZoomFactor
number
. The previous zoom factor.newZoomFactor
number
. The new zoom factor.zoomSettings
tabs.ZoomSettings
. Zoom settings for the tab.
Examples
Listen for zoom events and log the info:
function handleZoomed(zoomChangeInfo) {
console.log("Tab: " + zoomChangeInfo.tabId + " zoomed");
console.log("Old zoom: " + zoomChangeInfo.oldZoomFactor);
console.log("New zoom: " + zoomChangeInfo.newZoomFactor);
}
browser.tabs.onZoomChange.addListener(handleZoomed);
Browser compatibility
BCD tables only load in the browser
Acknowledgements
This API is based on Chromium's chrome.tabs
API. This documentation is derived from tabs.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.