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tabs.onZoomChange - Mozilla | MDN
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tabs.onZoomChange
Fired when a tab is zoomed.
Syntax
js
browser.tabs.onZoomChange.addListener(listener)
browser.tabs.onZoomChange.removeListener(listener)
browser.tabs.onZoomChange.hasListener(listener)
Events have three functions:
addListener(listener)-
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
listener-
The function called when this event occurs. The function is passed this argument:
ZoomChangeInfo-
object. Information about the zoom event. See the ZoomChangeInfo section for more details.
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:
js
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
Loading…
Note:
This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.