index.md

---

title: bookmarks.onChanged
slug: Mozilla/Add-ons/WebExtensions/API/bookmarks/onChanged
page-type: webextension-api-event
tags:
  - API
  - Add-ons
  - Bookmarks
  - Event
  - Extensions
  - Non-standard
  - Reference
  - WebExtensions
  - onChanged
browser-compat: webextensions.api.bookmarks.onChanged

---

{{AddonSidebar()}}

Fired when there is a change to:

• the title or URL of a bookmark

• the name of a folder.

Syntax

browser.bookmarks.onChanged.addListener(listener)
browser.bookmarks.onChanged.removeListener(listener)
browser.bookmarks.onChanged.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. Returns true 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:

    • id

      • : string. ID of the item that changed.

    • changeInfo

      • : object. Object containing two properties: title, a string containing the item's title, and url, a string containing the item's URL. If the item is a folder, url is omitted.

Note: Multiple events may occur when a bookmark changes, and that changeInfo object may contain only the data that has changed, rather than all the data for the bookmark. In other words, if the url for a bookmark changes, the changeInfo may only contain the new url information.

Examples

function handleChanged(id, changeInfo) {
  console.log(`Item: ${id} changed`);
  console.log(`Title: ${changeInfo.title}`);
  console.log(`Url: ${changeInfo.url}`);
}

function handleClick() {
  browser.bookmarks.onChanged.addListener(handleChanged);
}

browser.browserAction.onClicked.addListener(handleClick);

{{WebExtExamples}}

Browser compatibility

{{Compat}}

Note: This API is based on Chromium's chrome.bookmarks API. This documentation is derived from bookmarks.json in the Chromium code.