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tabs.onReplaced

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

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Fired when a tab is replaced with another tab due to prerendering or instant.

This event may not be relevant for or supported by browsers other than Chrome.

Syntax

js-nolint
browser.tabs.onReplaced.addListener(listener)
browser.tabs.onReplaced.removeListener(listener)
browser.tabs.onReplaced.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:
      • addedTabId
        • : integer. ID of the replacement tab.
      • removedTabId
        • : integer. ID of the tab that was replaced.

Examples

Listen for replacement events, and log the associated info:

js
function handleReplaced(addedTabId, removedTabId) {
  console.log(`New tab: ${addedTabId}`);
  console.log(`Old tab: ${removedTabId}`);
}

browser.tabs.onReplaced.addListener(handleReplaced);

{{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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