onOpen not executing?

Question

Hi guys im trying to display a sidebar on my google sheets every time it is opened. I am using the onOpen function and calling the html page, but it is not executing. When i run

Answer 1

A simple trigger open function can't open a sidebar because it runs on AuthMode.LIMITED. You should use a function that runs on Auth.Mode.FULL to open a sidebar, like an installable trigger.

I know that this isn't about add-ons but the following quote applies

From https://developers.google.com/apps-script/add-ons/lifecycle#authorization_modes

Note: Add-ons can't open sidebars or dialogs while executing in AuthMode.LIMITED. You can use menu items to open sidebars and dialogs since these run in AuthMode.FULL.

The cannonical references are

• https://developers.google.com/apps-script/guides/triggers/
• https://developers.google.com/apps-script/guides/triggers/events