Is there an event for when a Chrome Extension popup is closed?

Question

I\'ve already tried window.unload, window.beforeunload, etc. I\'m looking for a way to notify my background page once the popup is closed.

Answer 1

Finally found the solution. Put below code in background.js/eventPage.js:

chrome.windows.onFocusChanged.addListener(function(window) {
    //handle close event
});