Given the following code
window.addEventListener("visibilitychange", () => {
// do something here
if (iframe)
iframe.contentWindow.postMessage({
type: "visit_close",
page: document.title,
time: timeSpentOnPage,
shop: key,
user: member_id,
});
}
Is there any other reliable way to check if window is closing. Problem with visibilitychange event is that it gets fired on both load and unload.
As far as I remember, unload event is not reliable.