OnActivated仅在新标签页打开时有效

Question

I'm trying to communicate with the content script of the tab that has just been switched to using message passing. Here is my code in the background.js script.

chrome.tabs.onActivated.addListener(function(activeInfo) {
    chrome.tabs.sendMessage(activeInfo.tabId, { greeting: "hello" }, function(response) {
        console.log(response.farewell);
    });
});

And here is my code in my content script:

chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
    sendResponse({ farewell: "goodbye" });
    loadContent();
});

Is the content script no longer listening in an inactive tab even when it's switched back to that tab? Why does this only run in a newly opened tab?

To further clarify why I want to do this, sometimes tabs are left open without reloading, and my script has already been executed. When information pertaining to the script changes using the popup options, I want the content to reload on tab change, and a particular function to run again without reloading the page. Therefore, injecting the content script is less than ideal since it's already been executed.

Answer 1

Try this :

background.js

        chrome.tabs.onActivated.addListener(function(activeInfo) {

            chrome.tabs.query({
                active: true,
                currentWindow: true
            }, function(tabs) {

                 chrome.tabs.sendMessage(activeInfo.tabId, 
                  { greeting: "hello" }, function(response) {
                    console.log(response.farewell);
               });
            });

        });