[javascript] Communication between tabs or windows

There's a tiny open-source component to sync/communicate between tabs/windows of the same origin (disclaimer - I'm one of the contributors!) based around localStorage.

TabUtils.BroadcastMessageToAllTabs("eventName", eventDataString);

TabUtils.OnBroadcastMessage("eventName", function (eventDataString) {
    DoSomething();
});

TabUtils.CallOnce("lockname", function () {
    alert("I run only once across multiple tabs");
});

https://github.com/jitbit/TabUtils

P.S. I took the liberty to recommend it here since most of the "lock/mutex/sync" components fail on websocket connections when events happen almost simultaneously

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Communication between tabs or windows