How do I communicate a page(modal dialog) with its sibling (sidebar)?

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Perhaps it’s not really its parent and that’s the reason for it not working.

Right – there isn’t actually a DOM parent / child relationship in play here. Both the sidebar and the modal dialog were launched from server-side scripts, and are independent. They can both communicate with the server, though, so you can use a store-and-forward technique to get the result from your picker to the sidebar.

Basic idea:

  • The sidebar will start polling the server for the picker’s result as soon as it requests the picker’s launch.
  • The picker’s result will be sent to the server, using google.script.run.
  • The server will store the result temporarily – this could be as simple as a global variable, depending on your situation.
  • Once there is a result, the next poll will retrieve it.

Have a look at How to poll a Google Doc from an add-on for the basic idea of a poller.

Message Sequence Chart

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