Not implemented: This is not implemented in Firefox because it has been deprecated since Chrome 33. Please use runtime.onMessage instead.
Fired when a request is sent from either an extension process or a content script.
Syntax
chrome.extension.onRequest.addListener(function(
request, // optional any
sender, // runtime.MessageSender
function() {...} // function
) {...})
chrome.extension.onRequest.removeListener(listener)
chrome.extension.onRequest.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:
requestany. The request sent by the calling script.
senderruntime.MessageSender.
sendResponsefunction. Function to call (at most once) when you have a response. The argument should be any JSON-ifiable object, or undefined if there is no response. If you have more than oneonRequestlistener in the same document, then only one may send a response.
Browser compatibility
The compatibility table in 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.
| Chrome | Edge | Firefox | Firefox for Android | Opera | |
|---|---|---|---|---|---|
| Basic support | Yes | No | No | No | Yes |
This API is based on Chromium's chrome.extension API. This documentation is derived from extension.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.
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