在关闭弹出窗口时将数据保存到chrome.storage.sync-chrome扩展

Question

I've tried many ways but no event listener is getting triggered on/before closing of popup. You may find related questions on SO but nothing worked for me.
Here's what I tried:

 chrome.runtime.onSuspend.addListener(function hello() {
        chrome.storage.sync.set({
            'somedata': 'mydata1' // didn't work
        }, function() {});
    });

addEventListener("unload", function(event) {
    chrome.storage.sync.set({
        'somedata': 'mydata2'  // didn't work
    }, function() {});
}, true);

I just want to save some data when user closes the popup. That's all.

Answer 1

It's bugged so you have to do workarounds.

You'll have to save the data from the background page, so you need to pass the data to it from your popup.

Use chrome.runtime.connect to connect the two. A port is established: whenever the data you want to save from your popup changes you can Port.postMessage() to your background page.

When the popup closes, Port.onDisconnect will fire, and your data will be ready to sync.