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tabs.onDetached

files/en-us/mozilla/add-ons/webextensions/api/tabs/ondetached/index.md

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Fired when a tab is detached from a window, for example because it is being moved between windows.

Syntax

js-nolint
browser.tabs.onDetached.addListener(listener)
browser.tabs.onDetached.removeListener(listener)
browser.tabs.onDetached.hasListener(listener)

Events have three functions:

  • addListener(listener)
    • : 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

  • listener
    • : The function called when this event occurs. The function is passed these arguments:
      • tabId
        • : integer. ID of the tab that was detached.
      • detachInfo
        • : object. ID of the previous window, and index of the tab within it. See the detachInfo section for more details.

Additional objects

detachInfo

  • oldWindowId
    • : integer. ID of the previous window.
  • oldPosition
    • : integer. Index position that the tab had in the old window.

Examples

Listen for detach events, and log the info:

js
function handleDetached(tabId, detachInfo) {
  console.log(`Tab: ${tabId} moved`);
  console.log(`Old window: ${detachInfo.oldWindowId}`);
  console.log(`Old index: ${detachInfo.oldPosition}`);
}

browser.tabs.onDetached.addListener(handleDetached);

{{WebExtExamples}}

Browser compatibility

{{Compat}}

[!NOTE] This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.

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