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
listenerargument is the listener to remove. hasListener(listener)- Check whether
listeneris registered for this event. Returnstrueif it is listening,falseotherwise.
addListener syntax
Parameters
callback-
Function that will be called when this event occurs. The function will be passed the following arguments:
ZoomChangeInfoobject. Information about the zoom event.
Additional objects
ZoomChangeInfo
tabIdinteger. ID of the tab that was zoomed.oldZoomFactornumber. The previous zoom factor.newZoomFactornumber. The new zoom factor.zoomSettingstabs.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
The compatibility table on 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 | ||||
|---|---|---|---|---|---|
onZoomChange | Chrome Full support Yes | Edge No support No | Firefox Full support 45 | Opera Full support Yes | Firefox Android No support No |
Legend
- Full support
- Full support
- No support
- No support
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.
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