PlasmoHQ/plasmo

[BUG] sendToBackground is not allowed in MAIN world content script

Opened this issue · 3 comments

karthest commented

What happened?

As sendToBackground notes:
image
It seems like sending message from MAIN world content script to background is allowed by adding extensionId. But actually it can not because chrome.runtime is undefined in main world. And you will get this error if you follow the api's notes:
image

Version

Latest

What OS are you seeing the problem on?

Linux

What browsers are you seeing the problem on?

Chrome

Relevant log output

No response

(OPTIONAL) Contribution

  • I would like to fix this BUG via a PR

Code of Conduct

  • I agree to follow this project's Code of Conduct
  • I checked the current issues for duplicate problems.
nemmtor commented

also affected

sleekslush commented

If you inject into MAIN world and need to accomplish messaging, you're going to have to rely on using window.postMessage and have your content script set up listeners for those messages, which would then relay the message to your background script.

You could try to leverage https://docs.plasmo.com/framework/messaging#relay-flow , but I haven't personally tested it in this situation.

The main thing tho is if your code is in MAIN world, you don't have extension access at all, so you need to do this moderated message passing to accomplish it.

karthest commented

If you inject into MAIN world and need to accomplish messaging, you're going to have to rely on using window.postMessage and have your content script set up listeners for those messages, which would then relay the message to your background script.

You could try to leverage https://docs.plasmo.com/framework/messaging#relay-flow , but I haven't personally tested it in this situation.

The main thing tho is if your code is in MAIN world, you don't have extension access at all, so you need to do this moderated message passing to accomplish it.

Yes I knew that. I successfully send message from main world's content script to service worker with a 'bridge'. But sendMessageToBackground's hint is really confusing, it makes me feel like just add a extensionId and plasmo will handle it.

  • 👍1