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.
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 | ||||
|---|---|---|---|---|---|
| Basic support | 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
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);
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.
// Copyright 2015 The Chromium Authors. All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.