Passing message from background.js to popup.js

Question

I\'m trying to implement my own chrome extension on which, on a certain event, create a browser notification and fills the popup with data calculated in background.js

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Answer 1

Use runtime.sendMessage to send messages to background script, and tabs.sendMessage from background to content script.

Please note that you need to specify tab id:

chrome.tabs.query({ active: true }, (tabs) => {
    chrome.tabs.sendMessage(tabs[0].id, { greeting: 'hello' }, (response) => {
        console.log(response);
    });
});

You can find full example and documentation here: https://developer.chrome.com/extensions/messaging#simple