Event Calendar
See demo.
Full-sized drag & drop JavaScript event calendar with resource view:
- Lightweight (40.7kb br compressed
modern
version) - Zero-dependency (pre-built bundle)
- Used by Bookly
Inspired by FullCalendar, implements similar options.
Table of contents
Usage
Svelte component / ES6 module
The first step is to install the Event Calendar core
package:
npm install --save-dev @event-calendar/core
Then install any additional plugins you plan to use:
npm install --save-dev @event-calendar/time-grid
You must use at least one plugin that provides a view. The following plugins are currently available:
@event-calendar/day-grid
@event-calendar/list
@event-calendar/resource-time-grid
@event-calendar/time-grid
@event-calendar/interaction
(doesn't provide a view)
Then, in your Svelte component, use the calendar something like this:
<script>
import Calendar from '@event-calendar/core';
import TimeGrid from '@event-calendar/time-grid';
let plugins = [TimeGrid];
let options = {
view: 'timeGridWeek',
events: [
]
};
</script>
<Calendar {plugins} {options} />
Or in ES6 module:
import Calendar from '@event-calendar/core';
import TimeGrid from '@event-calendar/time-grid';
let ec = new Calendar({
target: document.getElementById('ec'),
props: {
plugins: [TimeGrid],
options: {
view: 'timeGridWeek',
events: [
]
}
}
});
Pre-built browser ready bundle
Include the following lines of code in the <head>
section of your page:
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@event-calendar/build/event-calendar.min.css">
<script src="https://cdn.jsdelivr.net/npm/@event-calendar/build/event-calendar.min.js"></script>
If you don't need IE11 support, you can use the modern
version of the bundle instead: event-calendar-modern.min.css
and event-calendar-modern.min.js
. The lack of IE11 support makes the bundle ~1.5 times smaller.
Then initialize the calendar with something like this:
let ec = new EventCalendar(document.getElementById('ec'), {
view: 'timeGridWeek',
events: [
]
});
Modifying options after initialization
You can modify the calendar options after initialization using the setOption method.
ec.setOption('slotDuration', '01:00');
In Svelte, you can simply update the original options
object.
<script>
import Calendar from '@event-calendar/core';
import TimeGrid from '@event-calendar/time-grid';
let plugins = [TimeGrid];
let options = {
view: 'timeGridWeek'
};
function updateOptions() {
options.slotDuration = '01:00';
}
</script>
<button on:click={updateOptions}>Change slot duration</button>
<Calendar {plugins} {options} />
Options
buttonText
- Type
object
- Default
{today: 'today', dayGridMonth: 'month', listDay: 'list', listWeek: 'list', listMonth: 'list', listYear: 'list', resourceTimeGridDay: 'day', resourceTimeGridWeek: 'week', timeGridDay: 'day', timeGridWeek: 'week'}
Text that is displayed in buttons of the header toolbar.
date
- Type
Date
or string
- Default
new Date()
Date that is currently displayed on the calendar.
This value can be either a JavaScript Date object, or an ISO8601 date string like '2022-12-31'
.
dateClick
- Type
function
- Default
undefined
Callback function that is triggered when the user clicks on a date or a time.
function (dateClickInfo) {}
dateClickInfo
is an object with the following properties:
date
| JavaScript Date object for the clicked date and time |
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
resource
|
If the current view is a resource view, the Resource object that owns this date
|
datesAboveResources
- Type
boolean
- Default
false
Determines whether the resource view should render the date headings above the resource headings.
- Type
object
or function
- Default
{weekday: 'short', month: 'numeric', day: 'numeric'}
Views override the default value as follows:
- dayGridMonth
{weekday: 'short'}
- timeGridDay
{weekday: 'long'}
Defines the text that is displayed on the calendar’s column headings.
This value can be either an object with options for the native JavaScript Intl.DateTimeFormat object, or a callback function that returns formatted string:
function (date) {
}
date
| JavaScript Date object that needs to be formatted |
displayEventEnd
Views override the default value as follows:
Determines whether to display an event’s end time.
dragScroll
Determines whether the calendar should automatically scroll during the event drag-and-drop when the mouse crosses the edge.
duration
- Type
string
, integer
or object
- Default
{weeks: 1}
Views override the default value as follows:
- dayGridMonth
{months: 1}
- listDay
{days: 1}
- listWeek
{weeks: 1}
- listMonth
{months: 1}
- listYear
{years: 1}
- resourceTimeGridDay
{days: 1}
- resourceTimeGridWeek
{weeks: 1}
- timeGridDay
{days: 1}
- timeGridWeek
{weeks: 1}
Sets the duration of a view.
This should be a value that can be parsed into a Duration object.
editable
- Type
boolean
- Default
false
Determines whether the events on the calendar can be dragged and resized (both at the same time).
Currently, only dragging is supported. See eventStartEditable.
events
Array of plain objects that will be parsed into Event objects and displayed on the calendar.
This option is not used if the eventSources
option is provided.
eventBackgroundColor
- Type
string
- Default
undefined
Sets the default background color for events on the calendar.
You can use any of the CSS color formats such '#f00'
, '#ff0000'
, 'rgb(255,0,0)'
, or 'red'
.
eventClick
- Type
function
- Default
undefined
Callback function that is triggered when the user clicks an event.
function (eventClickInfo) { }
eventClickInfo
is an object with the following properties:
el
| The HTML element for the event |
event
|
The associated Event object
|
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
eventColor
- Type
string
- Default
undefined
This is currently an alias for the eventBackgroundColor
.
eventContent
- Type
string
, object
or function
- Default
undefined
Defines the content that is rendered inside an event’s element.
This value can be either a string containing HTML '<p>...</p>'
, an object containing the HTML string {html: '<p>...</p>'}
, an object containing an array of DOM nodes {domNodes: [node1, node2, ...]}
or a function that returns any of the above formats:
function (eventInfo) {
}
eventInfo
is an object with the following properties:
event
|
The associated Event object
|
timeText
| Formatted time of the event |
view
|
The current View object
|
eventDidMount
- Type
function
- Default
undefined
Callback function that is triggered right after the element has been added to the DOM. If the event data changes, this is not called again.
function (mountInfo) { }
mountInfo
is an object with the following properties:
el
| The HTML element for the event |
event
|
The associated Event object
|
timeText
| Formatted time of the event |
view
|
The current View object
|
eventDragMinDistance
Defines how many pixels the user’s mouse must move before the event dragging begins.
eventDragStart
- Type
function
- Default
undefined
Callback function that is triggered when the event dragging begins.
function (info) { }
info
is an object with the following properties:
event
|
The associated Event object
|
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
eventDragStop
- Type
function
- Default
undefined
Callback function that is triggered when the event dragging stops.
It is triggered before the event’s information has been modified (if moved to a new date/time) and before the eventDrop callback is triggered.
function (info) { }
info
is an object with the following properties:
event
|
The associated Event object
|
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
eventDrop
- Type
function
- Default
undefined
Callback function that is triggered when dragging stops, and the event has moved to a different day/time.
It is triggered after the event’s information has been modified and after the eventDragStop callback has been triggered.
function (info) { }
info
is an object with the following properties:
event
|
The associated Event object
|
oldEvent
|
An Event object that holds information about the event before the drop
|
oldResource
|
If the resource has changed, this is the Resource object the event came from. If the resource has not changed, this will be undefined
|
newResource
|
If the resource has changed, this is the Resource object the event went to. If the resource has not changed, this will be undefined
|
delta
|
A Duration object that represents the amount of time the event was moved by
|
revert
|
A function that, if called, reverts the event’s start/end date to the values before the drag
|
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
eventMouseEnter
- Type
function
- Default
undefined
Callback function that is triggered when the user hovers over an event with the cursor (mouse pointer).
function (mouseEnterInfo) { }
mouseEnterInfo
is an object with the following properties:
el
| The HTML element for the event |
event
|
The associated Event object
|
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
eventMouseLeave
- Type
function
- Default
undefined
Callback function that is triggered when the cursor (mouse pointer) is moved out of an event.
function (mouseLeaveInfo) { }
mouseLeaveInfo
is an object with the following properties:
el
| The HTML element for the event |
event
|
The associated Event object
|
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
eventSources
- Type
EventSource[]
- Default
[]
Array of EventSource objects that will provide the Event Calendar with data about events.
This option is used instead of the events
option.
EventSource
should be an object with one of the following sets of properties:
1. Fetch events from a URL
url
|
A URL that the calendar will fetch Event objects from
|
method
|
HTTP request method. Default 'GET'
|
extraParams
|
Other GET/POST data you want to send to the server. Can be a plain object or a function that returns an object. Default {}
|
2. Execute custom function
events
|
A custom function that is executed whenever the Event Calendar needs new event data.
function(fetchInfo, successCallback, failureCallback) { }
fetchInfo is an object with the following properties:
start
| JavaScript Date object for the beginning of the range the calendar needs events for |
end
| JavaScript Date object for the end of the range the calendar needs events for. Note: This value is exclusive |
The successCallback function must be called by the custom function with an array of parsable Event objects.
If there is any failure (e.g., if an AJAX request fails), then call the failureCallback instead. It accepts an argument with information about the failure.
Instead of calling successCallback and failureCallback , you may return the resulting array of events or return a Promise (or thenable) object instead.
|
eventStartEditable
Determines whether the events on the calendar can be dragged.
eventTimeFormat
- Type
object
or function
- Default
{hour: 'numeric', minute: '2-digit'}
Defines the time-text that is displayed on each event.
This value can be either an object with options for the native JavaScript Intl.DateTimeFormat object, or a callback function that returns formatted string:
function (time) {
}
time
| JavaScript Date object that needs to be formatted |
filterResourcesWithEvents
- Type
boolean
- Default
false
Determines whether resources with no events for the current range should be hidden in the resource view.
firstDay
The day that each week begins at, where Sunday is 0
, Monday is 1
, etc. Saturday is 6
.
flexibleSlotTimeLimits
- Type
boolean
- Default
false
Determines whether slotMinTime and slotMaxTime should automatically expand when an event goes out of bounds.
- Type
object
- Default
{start: 'title', center: '', end: 'today prev,next'}
Defines the buttons and title at the top of the calendar.
An object can be supplied with properties start
,center
,end
. These properties contain strings with comma/space separated values. Values separated by a comma will be displayed adjacently. Values separated by a space will be displayed with a small gap in between. Strings can contain any of the following values:
title
| A text containing the current month/week/day |
prev
| A button for moving the calendar back one month/week/day |
next
| A button for moving the calendar forward one month/week/day |
today
| A button for moving the calendar to the current month/week/day |
a view name like dayGridMonth
| A button that will switch the calendar to a specific view |
height
- Type
string
- Default
'auto'
Defines the height of the entire calendar.
This should be a valid CSS value like '100%'
or '600px'
.
hiddenDays
Exclude certain days-of-the-week from being displayed, where Sunday is 0
, Monday is 1
, etc. Saturday is 6
.
highlightedDates
Array of dates that need to be highlighted in the calendar.
Each date can be either an ISO8601 date string like '2022-12-31'
, or a JavaScript Date object.
lazyFetching
Determines when event fetching should occur.
When set to true
(the default), the calendar will only fetch events when it absolutely needs to, minimizing HTTP requests. For example, say your calendar starts out in month view, in February. The Event Calendar will fetch events for the entire month of February and store them in its internal storage. Then, say the user switches to week view and begins browsing the weeks in February. The calendar will avoid fetching events because it already has this information stored.
When set to false
, the calendar will fetch events any time the view is switched, or any time the current date changes (for example, as a result of the user clicking prev/next).
listDayFormat
- Type
object
or function
- Default
{weekday: 'long'}
Defines the text on the left side of the day headings in list view.
This value can be either an object with options for the native JavaScript Intl.DateTimeFormat object, or a callback function that returns formatted string:
function (date) {
}
date
| JavaScript Date object that needs to be formatted |
listDaySideFormat
- Type
object
or function
- Default
{year: 'numeric', month: 'long', day: 'numeric'}
Defines the text on the right side of the day headings in list view.
This value can be either an object with options for the native JavaScript Intl.DateTimeFormat object, or a callback function that returns formatted string:
function (date) {
}
date
| JavaScript Date object that needs to be formatted |
loading
- Type
function
- Default
undefined
Callback function that is triggered when event fetching starts/stops.
function (isLoading) { }
isLoading
|
true when the calendar begins fetching events, false when it’s done.
|
locale
- Type
string
- Default
undefined
Defines the locales
parameter for the native JavaScript Intl.DateTimeFormat object that the Event Calendar uses to format date and time strings in options such as dayHeaderFormat, eventTimeFormat, etc.
monthMode
- Type
boolean
- Default
false
Views override the default value as follows:
Tells the calendar that visible dates should start from the firstDay of the week, even if it will display days outside the current range (this is a common case for a month calendar when you can see days from adjacent months).
noEventsClick
- Type
function
- Default
undefined
Callback function that is triggered when the user clicks No events area in list view.
function (clickInfo) { }
clickInfo
is an object with the following properties:
jsEvent
| JavaScript native event object with low-level information such as click coordinates |
view
|
The current View object
|
noEventsContent
- Type
string
, object
or function
- Default
'No events'
Defines the text that is displayed in list view when there are no events to display.
This value can be either a string containing HTML '<p>...</p>'
, an object containing the HTML string {html: '<p>...</p>'}
, an object containing an array of DOM nodes {domNodes: [node1, node2, ...]}
or a function that returns any of the above formats:
function () {
}
resources
Array of plain objects that will be parsed into Resource objects for displaying in the resource view.
scrollTime
- Type
string
, integer
or object
- Default
'06:00:00'
Determines how far forward the scroll pane is initially scrolled.
This should be a value that can be parsed into a Duration object.
slotDuration
- Type
string
, integer
or object
- Default
'00:30:00'
Defines the frequency for displaying time slots.
This should be a value that can be parsed into a Duration object.
slotHeight
Defines the time slot height in pixels. When changing the setting, you must additionally override the following CSS styles:
.ec-time, .ec-line {
height: 24px;
}
slotLabelFormat
- Type
object
or function
- Default
{hour: 'numeric', minute: '2-digit'}
Defines the text that will be displayed within a time slot.
This value can be either an object with options for the native JavaScript Intl.DateTimeFormat object, or a callback function that returns formatted string:
function (time) {
}
time
| JavaScript Date object that needs to be formatted |
slotMaxTime
- Type
string
, integer
or object
- Default
'24:00:00'
Defines the last time slot that will be displayed for each day.
This should be a value that can be parsed into a Duration object.
slotMinTime
- Type
string
, integer
or object
- Default
'00:00:00'
Defines the first time slot that will be displayed for each day.
This should be a value that can be parsed into a Duration object.
theme
- Type
object
or function
- Default
{calendar: 'ec', header: 'ec-header', withScroll: 'ec-with-scroll', hiddenScroll: 'ec-hidden-scroll', body: 'ec-body', week: 'ec-week', compact: 'ec-compact', toolbar: 'ec-toolbar', sidebar: 'ec-sidebar', content: 'ec-content', lines: 'ec-lines', line: 'ec-line', days: 'ec-days', day: 'ec-day', dayHead: 'ec-day-head', today: 'ec-today', otherMonth: 'ec-other-month', highlight: 'ec-highlight', events: 'ec-events', event: 'ec-event', eventTime: 'ec-event-time', eventTitle: 'ec-event-title', bgEvents: 'ec-bg-events', bgEvent: 'ec-bg-event', hiddenTimes: 'ec-hidden-times', time: 'ec-time', button: 'ec-button', buttonGroup: 'ec-button-group', icon: 'ec-icon', active: 'ec-active', title: 'ec-title', month: 'ec-month', daySide: 'ec-day-side', eventTag: 'ec-event-tag', list: 'ec-list', noEvents: 'ec-no-events', resource: 'ec-resource', resourceTitle: 'ec-resource-title'}
Defines the CSS classes that the Event Calendar uses to generate HTML markup.
This value can be either a plain object with all necessary properties, or a callback function that receives default theme object and should return an actual one:
function (theme) {
}
theme
| An object with default CSS classes |
titleFormat
- Type
object
or function
- Default
{year: 'numeric', month: 'short', day: 'numeric'}
Views override the default value as follows:
- dayGridMonth
{year: 'numeric', month: 'long'}
- timeGridDay
{year: 'numeric', month: 'long', day: 'numeric'}
Defines the text that is displayed in the header toolbar’s title.
This value can be either an object with options for the native JavaScript Intl.DateTimeFormat object, or a callback function that returns formatted string:
function (date) {
}
date
| JavaScript Date object that needs to be formatted |
view
- Type
string
- Default
'resourceTimeGridWeek'
The view that is displayed in the calendar. Can be 'dayGridMonth'
, 'listDay'
, 'listWeek'
, 'listMonth'
, 'listYear'
, 'resourceTimeGridDay'
, 'resourceTimeGridWeek'
, 'timeGridDay'
or 'timeGridWeek'
.
viewDidMount
- Type
function
- Default
undefined
Callback function that is triggered right after the view has been added to the DOM.
function (mountInfo) { }
mountInfo
is an object with the following properties:
view
|
The mounted View object
|
views
You can specify options that apply only to specific views. To do so provide separate options objects within the views
option, keyed by the name of the view.
Methods
Methods allow you to manipulate the Event Calendar after initialization. They are accessible from the calendar instance.
In Svelte, methods are available from a component instance:
<script>
import Calendar from '@event-calendar/core';
import TimeGrid from '@event-calendar/time-grid';
let ec;
let plugins = [TimeGrid];
let options = {
view: 'timeGridWeek',
eventSources: [{events: function() {
console.log('fetching...');
return [];
}}]
};
function invokeMethod() {
ec.refetchEvents();
}
</script>
<button on:click={invokeMethod}>Refetch events</button>
<Calendar bind:this={ec} {plugins} {options} />
getOption( name )
- Parameters
name
string
The option name
- Return value
mixed
or undefined
This method allows you to get the current value of any calendar option.
let date = ec.getOption('date');
setOption( name, value )
- Parameters
name
string
The option namevalue
mixed
The new option value
- Return value
EventCalendar
The calendar instance for chaining
This method allows you to set new value to any calendar option.
ec.setOption('date', new Date());
getEventById( id )
- Parameters
id
string|integer
The ID of the event
- Return value Event object or
null
Returns a single event with the matching id
.
removeEventById( id )
- Parameters
id
string|integer
The ID of the event
- Return value
EventCalendar
The calendar instance for chaining
Removes a single event with the matching id
.
addEvent( event )
- Parameters
event
object
A plain object that will be parsed into an Event object
- Return value Event object or
null
Adds a new event to the calendar.
updateEvent( event )
- Parameters
event
object
A plain object or Event object
- Return value
EventCalendar
The calendar instance for chaining
Updates a single event with the matching event
.id
.
refetchEvents()
- Return value
EventCalendar
The calendar instance for chaining
Refetches events from all sources.
getView()
Returns the View object for the current view.
Event object
This is a JavaScript object that the Event Calendar uses to store information about a calendar event.
Here are all properties that exist in Event object:
id
| A unique string identifier of the event |
resourceIds
| An array of resource IDs that the event is associated with |
start
| JavaScript Date object holding the event’s start time |
end
| JavaScript Date object holding the event’s end time |
title
| The text appearing on the event |
display
|
The rendering type of the event. Can be 'auto' or 'background'
|
backgroundColor
|
The eventBackgroundColor override for this specific event
|
extendedProps
|
A plain object holding miscellaneous properties specified during parsing in the explicitly given extendedProps field
|
Parsing event from a plain object
When Event Calendar receives an array of plain event’s objects either from the events
option or as a result of an HTTP request to a URL of an event source, it parses the input objects into proper Event objects.
Here are all admissible fields for the event’s input object:
id
|
string or integer A unique identifier of the event. Default auto-generated value
|
resourceId
|
string or integer An ID of a resource that the event is associated with. This field is not used if resourceIds is provided. Default undefined
|
resourceIds
|
Array An array of resource IDs that the event is associated with. This field is used instead of resourceId . Default []
|
start
|
string or Date This should be either an ISO8601 datetime string like '2022-12-31 09:00:00' , or a JavaScript Date object holding the event’s start time
|
end
|
string or Date This should be either an ISO8601 datetime string like '2022-12-31 13:00:00' , or a JavaScript Date object holding the event’s end time
|
title
|
string The text that will appear on the event. Default ''
|
display
|
string The rendering type of the event. Can be 'auto' or 'background' . Default 'auto'
In addition, in your callback functions, you may get the 'ghost' and 'preview' for this property, which are internal values and are used to display events during drag-and-drop operations
|
backgroundColor
|
string Sets the event’s background color just like the calendar-wide eventBackgroundColor option. Default undefined
|
color
|
string This is currently an alias for the backgroundColor field. Default undefined
|
extendedProps
|
object A plain object with any miscellaneous properties. It will be directly transferred to the extendedProps property of the Event object. Default {}
|
Duration object
This is a JavaScript object that the Event Calendar uses to store information about a period of time, like 30 minutes or 1 day and 6 hours.
Here are all properties that exist in Duration object:
years
| The number of years in duration |
months
| The number of months in duration |
days
| The number of days in duration |
seconds
| The number of seconds in duration. If you want hours and minutes, you need to do division on this property |
inWeeks
| Determines whether the duration represents a time period in weeks. This value is set during parsing the input data |
Parsing duration from input values
When Event Calendar receives a value for options like duration
, scrollTime
, slotDuration
and others, it parses it into a proper Duration object.
The admissible input value can be specified in one of three formats:
- an object with any of the following keys:
year
, years
, month
, months
, day
, days
, minute
, minutes
, second
, seconds
- a string in the format
hh:mm:ss
or hh:mm
. For example, '05:00'
specifies 5 hours - an integer specifying the total number of seconds
Resource object
This is a JavaScript object that the Event Calendar uses to store information about a resource. Calendar events can be associated with resources and displayed separately using the resource view.
Here are all properties that exist in Resource object:
id
| The unique string identifier for the resource |
title
| The title of the resource |
Parsing resource from a plain object
When Event Calendar receives an array of plain resource’s objects for the resources
option, it parses the input objects into proper Resource objects.
Here are all admissible fields for the resource’s input object:
id
|
integer or string Uniquely identifies the resource. Event objects with a corresponding resourceIds field will be linked to this resource. Will be coerced into a string
|
title
|
string Text that will be displayed on the resource when it is rendered. Default ''
|
View object
A View object contains information about a calendar view, such as title and date range.
Here are all properties that exist in View object:
type
| Name of the view |
title
| Title text that is displayed at the top of the header toolbar |
currentStart
| JavaScript Date that is the start of the interval the view is trying to represent. For example, in month view, this will be the first day of the month. This value disregards hidden days |
currentEnd
| JavaScript Date that is the end of the interval the view is trying to represent. Note: This value is exclusive. For example, in month view, this will be the day after the last day of the month. This value disregards hidden days |
activeStart
| JavaScript Date that is the first visible day. In month view, this value is often before the 1st day of the month, because most months do not begin on the first day-of-week |
activeEnd
| JavaScript Date that is the last visible day. Note: This value is exclusive |
Browser support
- Chrome (latest)
- Firefox (latest)
- Safari (latest)
- Opera (latest)
- Edge (latest)
- Internet Explorer 11