events from Google Calendar

FullCalendar can display events from a public Google Calendar. Google Calendar can serve as a backend that manages and persistently stores event data (a feature that FullCalendar currently lacks).

Before you code…

You must first have a Google Calendar API Key:

1. Go to the Google Developer Console and create a new project (it might take a second).
2. Once in the project, go to APIs & auth > APIs on the sidebar.
3. Find “Calendar API” in the list and turn it ON.
4. On the sidebar, click APIs & auth > Credentials.
5. In the “Public API access” section, click “Create new Key”.
6. Choose “Browser key”.
7. If you know what domains will host your calendar, enter them into the box. Otherwise, leave it blank. You can always change it later.
8. Your new API key will appear. It might take second or two before it starts working.

Make your Google Calendar public:

1. In the Google Calendar interface, locate the “My calendars” area on the left.
2. Hover over the calendar you need and click the downward arrow.
3. A menu will appear. Click “Share this Calendar”.
4. Check “Make this calendar public”.
5. Make sure “Share only my free/busy information” is unchecked.
6. Click “Save”.

Obtain your Google Calendar’s ID:

1. In the Google Calendar interface, locate the “My calendars” area on the left.
2. Hover over the calendar you need and click the downward arrow.
3. A menu will appear. Click “Calendar settings”.
4. In the “Calendar Address” section of the screen, you will see your Calendar ID. It will look something like “abcd1234@group.calendar.google.com”.

Getting Set Up

You must include the google-calendar plugin. If you are using an ES6 build system then do something like this:

import { Calendar } from '@fullcalendar/core';
import googleCalendarPlugin from '@fullcalendar/google-calendar';
...
let calendar = new Calendar(calendarEl, {
  plugins: [ googleCalendarPlugin ]
});

Alternatively, you can use script tags and browser globals:

<script src='fullcalendar/core/main.js'></script>
<script src='fullcalendar/google-calendar/main.js'></script>
<script>
...
var calendar = new FullCalendar.Calendar(calendarEl, {
  plugins: [ 'googleCalendar' ]
});
...
</script>

Writing the code

Now it’s time to initialize your calendar in JavaScript. This is the most minimal example:

let calendar = new Calendar(calendarEl, {
  plugins: [ googleCalendarPlugin ],
  googleCalendarApiKey: '<YOUR API KEY>',
  events: {
    googleCalendarId: 'abcd1234@group.calendar.google.com'
  }
});

If you want to specify some Event Source options, you can include them in the events object:

let calendar = new Calendar(calendarEl, {
  plugins: [ googleCalendarPlugin ],
  googleCalendarApiKey: '<YOUR API KEY>',
  events: {
    googleCalendarId: 'abcd1234@group.calendar.google.com',
    className: 'gcal-event' // an option!
  }
});

View a demo that displays US holidays from Google Calendar.

Multiple Google Calendars

You can specify multiple Google Calendars by using the eventSources option:

<script type='text/javascript'>

  document.addEventListener('DOMContentLoaded', function() {
    var calendarEl = document.getElementById('calendar');

    var calendar = new FullCalendar.Calendar(calendarEl, {
      googleCalendarApiKey: '<YOUR API KEY>',
      eventSources: [
        {
          googleCalendarId: 'abcd1234@group.calendar.google.com'
        },
        {
          googleCalendarId: 'efgh5678@group.calendar.google.com',
          className: 'nice-event'
        }
      ]
    });

    calendar.render();
  });

</script>

Extended Properties

Google Calendar’s API allows you to specify Extended Properties for your events. The extended properties will be available in the extendedProps hash of each Event Object.

Advanced

If you need different API keys per calendar, you can set a googleCalendarApiKey option on each individual Event Source when written in extended form.

For detecting errors, use the Event Source Object’s failure callback.