Google apps script permission to access a folder

Question

This simple code works in a standalone script and also in a script bound to a google sheet if i run directly the function, but get a permission error when i run it opening the sheet. Where is the problem?

function onOpen() {
  jsondir = DriveApp.getFolderById("XXXXXXXXXXXXXXXXXXXXXXXXXXXX")
  Logger.log(jsondir)
}

Answer 1

In the case of use of method (DriveApp) which is required the authorization, the function has to be installed as a trigger. How to install the trigger is as follows. The detail information is here .

• On the script editor.
  • Edit -> Current project's triggers
  • Click "No triggers set up. Click here to add one now."
  • At "Run", select "onOpen"
  • At Events, select "From spreadsheet" and "On open"
  • Push "Save" button.

If I misunderstand your question, I'm sorry.