streamlit-calendar 📆

A Streamlit component to show calendar view using FullCalendar with support for Streamlit light/dark theme, callbacks, and custom CSS

🌏Demo

⚙️Installation

pip install streamlit-calendar

💻Usage

import streamlit as st
from streamlit_calendar import calendar

calendar_options = {
    "editable": True,
    "selectable": True,
    "headerToolbar": {
        "left": "today prev,next",
        "center": "title",
        "right": "resourceTimelineDay,resourceTimelineWeek,resourceTimelineMonth",
    },
    "slotMinTime": "06:00:00",
    "slotMaxTime": "18:00:00",
    "initialView": "resourceTimelineDay",
    "resourceGroupField": "building",
    "resources": [
        {"id": "a", "building": "Building A", "title": "Building A"},
        {"id": "b", "building": "Building A", "title": "Building B"},
        {"id": "c", "building": "Building B", "title": "Building C"},
        {"id": "d", "building": "Building B", "title": "Building D"},
        {"id": "e", "building": "Building C", "title": "Building E"},
        {"id": "f", "building": "Building C", "title": "Building F"},
    ],
}
calendar_events = [
    {
        "title": "Event 1",
        "start": "2023-07-31T08:30:00",
        "end": "2023-07-31T10:30:00",
        "resourceId": "a",
    },
    {
        "title": "Event 2",
        "start": "2023-07-31T07:30:00",
        "end": "2023-07-31T10:30:00",
        "resourceId": "b",
    },
    {
        "title": "Event 3",
        "start": "2023-07-31T10:40:00",
        "end": "2023-07-31T12:30:00",
        "resourceId": "a",
    }
]
custom_css="""
    .fc-event-past {
        opacity: 0.8;
    }
    .fc-event-time {
        font-style: italic;
    }
    .fc-event-title {
        font-weight: 700;
    }
    .fc-toolbar-title {
        font-size: 2rem;
    }
"""

calendar = calendar(events=calendar_events, options=calendar_options, custom_css=custom_css)
st.write(calendar)

📝API References

Initialization Args

For complete event object properties, check out: https://fullcalendar.io/docs/event-object
For complete options object properties, check out: https://fullcalendar.io/docs
For complete custom_css options, check out: https://fullcalendar.io/docs/css-customization

Component Values

The component value, i.e. the return value of the calendar(...) instance, is a dict which properties depends on the current called callback.

For example, when the user clicked on an event, the component value would be:

st.write(calendar)
# {
#   "callback": "eventClick",
#   "eventClick": {
#     "event": {
#       "allDay": true,
#       "title": "Event 1",
#       "start": "2023-07-03",
#       "end": "2023-07-05",
#       "backgroundColor": "#FF6C6C",
#       "borderColor": "#FF6C6C"
#     },
#     "view": {
#       "type": "dayGridMonth",
#       "title": "July 2023",
#       "activeStart": "2023-06-24T17:00:00.000Z",
#       "activeEnd": "2023-08-05T17:00:00.000Z",
#       "currentStart": "2023-06-30T17:00:00.000Z",
#       "currentEnd": "2023-07-31T17:00:00.000Z"
#     }
#   },
# }

The properties of each callback is explained as follows:

dateClick

Triggered when the user clicks on a date or a time.

Source: https://fullcalendar.io/docs/dateClick

Property	Type	Description
allDay	boolean	true or false whether the click happened on an all-day cell.
date	string	a date for the clicked day/time in ISO8601 string format.
view	View	The current view.
resource	Resource	If the current view is a resource-view, the resource that owns this date.

eventClick

Triggered when the user clicks an event.

Source: https://fullcalendar.io/docs/eventClick

Property	Type	Description
event	Event	The associated event.
view	View	The current view.

eventChange

Called after an event has been modified in some way.

Source: https://fullcalendar.io/docs/eventChange

Property	Type	Description
oldEvent	Event	An event with data prior to the change.
event	Event	An Event Object with the updated changed data.
relatedEvents	Event[]	An array of other related events that were also affected. An event might have other recurring event instances or might be linked to other events with the same groupId.

eventsSet

Called after event data is initialized OR changed in any way.

Source: https://fullcalendar.io/docs/eventsSet

Property	Type	Description
events	Event[]	An array of events. It contains every event in memory.

select

Triggered when a date/time selection is made.

Source: https://fullcalendar.io/docs/select-callback

Property	Type	Description
allDay	boolean	true or false whether the selection happened on all-day cells.
start	string	a date indicating the beginning of the selection in ISO8601 string format.
end.	string	a date indicating the end of the selection in ISO8601 string format.
view	View	The current view.
resource	Resource	If the current view is a resource-view, the resource that owns this selection.

Types

Event

Source: https://fullcalendar.io/docs/event-object

Property	Type	Description
id	string	A unique identifier of an event.
groupId	string	Events that share a groupId will be dragged and resized together automatically.
allDay	boolean	Determines if the event is shown in the “all-day” section of relevant views. In addition, if true the time text is not displayed with the event.
start	string	An ISO8601 string representation of the start date. If the event is all-day, there will not be a time part.
end	string	An ISO8601 string representation of the end date. If the event is all-day, there will not be a time part.
title	string	The text that will appear on an event.
url	string	A URL that will be visited when this event is clicked by the user.
classNames	string[]	An array of strings like [ 'myclass1', myclass2' ]. Determines which HTML classNames will be attached to the rendered event.
display	string	The rendering type of this event. Can be 'auto', 'block', 'list-item', 'background', 'inverse-background', or 'none'.
backgroundColor	string	The eventBackgroundColor override for this specific event.
borderColor	string	The eventBorderColor override for this specific event.
textColor	string	The eventTextColor override for this specific event.
extendedProps	Dictionary	A plain object holding miscellaneous other properties specified during parsing. Receives properties in the explicitly given extendedProps hash as well as other non-standard properties.
resourceId	string	The unique string identifier for the resource of the event (if any).

Resource

Source: https://fullcalendar.io/docs/resource-object

Property	Type	Description
id	string	The unique string identifier for this resource.
title	string	The title of this resource.
eventBackgroundColor	string	Same as Event.backgroundColor.
eventBorderColor	string	Same as Event.borderColor.
eventTextColor	string	Same as Event.textColor.
eventClassNames	string[]	Same as Event.ClassNames.
extendedProps	Dictionary	A hash of non-standard props that were specified during parsing

View

Source: https://fullcalendar.io/docs/view-object

Property	Type	Description
type	string	Name of one of the available views.
title	string	Title text that is displayed at the top of the headerToolbar.
activeStart	string	An ISO8601 string that is the first visible day.
activeEnd	string	An ISO8601 string that is the last visible day.
currentStart	string	An ISO8601 string that is the start of the interval the view is trying to represent.
currentEnd	string	An ISO8601 string that is the end of the interval the view is trying to represent.

🛠️Development

Note: you only need to run these steps if you want to change this component or contribute to its development!

Setup

First, clone the repository:

git clone https://github.com/im-perativa/streamlit-calendar.git
cd streamlit-calendar

Install the Python dependencies:

poetry install

And install the frontend dependencies:

cd streamlit_calendar/frontend
npm install

Making changes

To make changes, first go to streamlit_calendar/__init__.py and make sure the variable _RELEASE is set to False. This will make the component use the local version of the frontend code, and not the built project.

Then, start one terminal and run:

cd streamlit_calendar/frontend
npm start

This starts the frontend code on port 3001.

Open another terminal and run:

cd streamlit_calendar
poetry shell
streamlit run __init__.py

This runs the development version on local Streamlit server. Now you can make changes to the Python or Javascript code in streamlit_calendar and the demo app should update automatically!

If nothing updates, make sure the variable _RELEASE in streamlit_calendar/__init__.py is set to False.