g-suite Google Calender Apps script On Event Save/Update

Question

First of all, i am new to Google Workspace and this is the first time i am developing an addon. I am trying to develop a Google Workspace(gsuite) Addon using Google Apps Script, My main objectives are:

1. Whenever i create/save/update an event in Google Calender, i want to make an alert asking for ok and cancel , if i click cancel the event should not be created and if i click ok then the event should be created and the script function should call my API endpoint with the following parameters:

    { summary: summary_of_the_event, created: event_created_or_updated_date, googleCalendarId: calender_id }

Here is the reference to Apps script Google calender:

https://developers.google.com/apps-script/reference/calendar/calendar-app

I appreciate the help.

Answer 1

Some thoughts about calendar add-ons

• CalendarApp features the installable calendar trigger with the specification :

  Calendar triggers fire when a user's calendar events are updated (created, edited, or deleted).

  • Installble triggers can be used in Google Workspace add-ons

  • Howver, this installable trigger only fire after the event has been created / updated, so it can help you to cancel event creation, but rather no manually delete the event a posteriori.

  • Mind also that the when the trigger fires, it does not give you any information about the created / updated event - you have to manually find this event eg by querying for the least created / updated event in user's calendar.

• Google Workspace Calendar add-ons feature the manifest trigger for updating calendar events calendar.eventUpdateTrigger

  • Thereby:

  This trigger only fires if the user makes one or more of the following edits:

  Adds one or more attendees.

  Removes one or more attendees.

  Adds or switches to a different conferencing solution.

• Google Workspace Calendar add-ons also feature the manifest trigger calendar.eventOpenTrigger

  • It fires when you open an event (this is what you want!).
  • However, this work only for already existing events - not when a user opens the Calendar UI interface to create a new event

• Instead of letting a user create / update events through the regular Calendar UI, you can use Card Service to create a custom add-on interface where the user can specify that he wants to create an event
  • Within the card interface, it is easier to implement an ok / cancel functionality (as a card) and then (in case "ok" is clicked) create an event for the user programmatically.