Import iCal (ics) with fullcalendar?

Question

What would need to be done in order to load .ics files with fullcalendar? I cannot use php or .net unfortunately.

Answer 1

There is support for iCalendar as an event source as of V 5.5.0.

You can view the docs here: https://fullcalendar.io/docs/icalendar

Example:

import dayGridPlugin from '@fullcalendar/daygrid'
import iCalendarPlugin from '@fullcalendar/icalendar'

var calendar = new Calendar(calendarEl, {
  plugins: [dayGridPlugin, iCalendarPlugin],
  events: {
    url: 'https://mywebsite/icalendar-feed.ics',
    format: 'ics'
  }
})

calendar.render()

Answer 2

I manage to do it. Not as hard as I thought. I use ical.js as ics parser. After parsing, I get a json object which contains all the information in the ics. And then traverse it and construct event object according to the definition of FullCalendar Event object.

Update with FullCalendar v4 and reccuring events

As v4 changed the initialization code and the code bellow didn't count with recurring events, here's one that does and works with the v4 version:

$.get(calendarUrl).then(function (data) {
     // parse the ics data
     var jcalData = ICAL.parse(data.trim());
     var comp = new ICAL.Component(jcalData);
     var eventComps = comp.getAllSubcomponents("vevent");
     // map them to FullCalendar events
     var events = $.map(eventComps, function (item) {

        if (item.getFirstPropertyValue("class") == "PRIVATE") {
            return null;
        }
        else {
            var toreturn = {
                "title": item.getFirstPropertyValue("summary"),
                "location": item.getFirstPropertyValue("location"),
            };
            var rrule=item.getFirstPropertyValue("rrule");
            if(rrule!= null){ //event recurs
                toreturn.rrule={};
                if(rrule.freq) toreturn.rrule.freq=rrule.freq;
                if(rrule.parts.BYDAY) toreturn.rrule.byweekday=rrule.parts.BYDAY;
                if(rrule.until) toreturn.rrule.until=rrule.until.toString();
                if(rrule.until) toreturn.rrule.until=rrule.until.toString();
                if(rrule.interval) toreturn.rrule.interval=rrule.interval;
                var dtstart=item.getFirstPropertyValue("dtstart").toString();
                var dtend=item.getFirstPropertyValue("dtend").toString();
                toreturn.rrule.dtstart=dtstart;
                //count duration ms
                var startdate=new Date(dtstart);
                var enddate=new Date(dtend);
                toreturn.duration = enddate - startdate;
            }else{
                toreturn.start=item.getFirstPropertyValue("dtstart").toString();
                toreturn.end=item.getFirstPropertyValue("dtend").toString();
            }
            return toreturn;
        }
     });
     var calendarEl = document.getElementById('calendar');
     var calendar = new FullCalendar.Calendar(calendarEl, {

              plugins: [ 'interaction','dayGrid','rrule' ],
              defaultView: 'dayGridWeek',
              displayEventEnd: true,
              header: {
                  left: 'prev,next',
                  center: 'title',
                  right: 'dayGridDay,dayGridWeek,dayGridMonth'
              },
              events: events,
              eventRender: function (info) {
                // console.log(info.event);
                // append location
                if (info.event.extendedProps.location != null && info.event.extendedProps.location != "") {
                    info.el.append(info.event.extendedProps.location );
                }
              }
     });
     calendar.render();
});

Original answer's code (v3 and lower):

$.get(calendarUrl).then(function (data) {
// parse the ics data
var jcalData = ICAL.parse(data.trim());
var comp = new ICAL.Component(jcalData);
var eventComps = comp.getAllSubcomponents("vevent");
// console.log(JSON.stringify(eventComps));
// map them to FullCalendar events
var events = $.map(eventComps, function (item) {
    if (item.getFirstPropertyValue("class") == "PRIVATE") {
        return null;
    }
    else {
        return {
            "title": item.getFirstPropertyValue("summary") + ";",
            "start": item.getFirstPropertyValue("dtstart").toJSDate(),
            "end": item.getFirstPropertyValue("dtend").toJSDate(),
            "location": item.getFirstPropertyValue("location")
        };
    }
});

// refresh the control
calendarCtrl.fullCalendar('destroy');
calendarCtrl.fullCalendar({
    events: events,
    timeFormat: "H:mm",
    displayEventEnd: true,
    eventRender: function (event, element) {
        // console.log(element);
        // append location
        if (event.location != null && event.location != "") {
            element.append("<span>" + event.location + "</span>");
        }
    },
    header: {
        left: 'title',
        center: '',
        right: 'today,month,basicWeek,listDay prev,next'
    }
});
});