A modern and responsive react timeline component.
JavaScript CSS HTML
Latest commit 5169ad3 Nov 30, 2016 @mariusandra mariusandra 0.11.1 build


React Calendar Timeline

A modern and responsive react timeline component.

calendar demo

Demo here: http://namespace.ee/react-calendar-timeline/

Getting started

# via yarn
yarn add react-calendar-timeline

# via npm
npm install --save react-calendar-timeline

react-calendar-timeline has react, react-dom, moment and interact.js as peer dependencies.

You need to install them separately:

# via yarn
yarn add react react-dom # you probably already have these
yarn add moment interact.js

# via npm
npm install --save react react-dom # you probably already have these
npm install --save moment interact.js


At the very minimum:

import Timeline from 'react-calendar-timeline'
import moment from 'moment'

const groups = [
  {id: 1, title: 'group 1'},
  {id: 2, title: 'group 2'}

const items = [
  {id: 1, group: 1, title: 'item 1', start_time: moment(), end_time: moment().add(1, 'hour')},
  {id: 2, group: 2, title: 'item 2', start_time: moment().add(-0.5, 'hour'), end_time: moment().add(0.5, 'hour')},
  {id: 3, group: 1, title: 'item 3', start_time: moment().add(2, 'hour'), end_time: moment().add(3, 'hour')}

    Rendered by react!
    <Timeline groups={groups}
              defaultTimeStart={moment().add(-12, 'hour')}
              defaultTimeEnd={moment().add(12, 'hour')}


NB! All props need to be immutable. For example, this means if you wish to change the title of one of your items, please pass in a whole new items array instead of changing the title in the old array. Here's more info.

The component can take many props:


Expects either a vanilla JS array or an immutableJS array, consisting of objects with the following attributes:

  id: 1,
  title: 'group 1'


Expects either a vanilla JS array or an immutableJS array, consisting of objects with the following attributes:

  id: 1,
  group: 1,
  title: 'Random title',
  start_time: 1457902922261,
  end_time: 1457902922261 + 86400000,
  canMove: true,
  canResize: false,
  canChangeGroup: false,
  className: 'weekend',
  itemProps: {
    'data-custom-attribute': 'Random content'

The preferred (fastest) option is to give unix timestamps in milliseconds for start_time and end_time. Objects that convert to them (java Date or moment()) will also work, but will be a lot slower.


An array specifying keys in the items and groups objects. Defaults to

  groupIdKey: 'id',
  groupTitleKey: 'title',
  itemIdKey: 'id',
  itemTitleKey: 'title',    // key for item div content
  itemDivTitleKey: 'title', // key for item div title (<div title="text"/>)
  itemGroupKey: 'group',
  itemTimeStartKey: 'start_time',
  itemTimeEndKey: 'end_time'


Width of the sidebar in pixels. Defaults to 150.


Snapping unit when dragging items. Defaults to 15 * 60 * 1000 or 15min. When so, the items will snap to 15min intervals when dragging.


The minimum width, in pixels, of a timeline entry when it's possible to resize. If not reached, you must zoom in to resize more. Default to 20.


How does the header (the scrolling part with dates) behave if not all of the groups fit on the page, resulting in a vertical scrollbar.

  • fixed - the header is always on the screen
  • none (default) - the header is always at the top of the component


If your calendar has large items compared to the zoom level (e.g. multi week events when viewing one day at a time), set this to true (default).

If you have many small events compared to the zoom level (e.g. hundreds of 30min events and viewing one week at a time), set this to false.

When set to true we update the dimensions of the items on every scroll event. This looks nicer, as 1) item labels are always fully on the screen, even if the start or end of the items is off screen, 2) item stacking also reflects what's on the screen.

When set to false, we update the dimensions of the items only when the scrolling canvas updates. This makes scrolling much faster, but labels can go off screen.


What z-index value do the header and the sidebar have. Default 10


Height of one line in the calendar in pixels. Default 30


Height of the top header line. Default 30


Height of the bottom header line. Default 30


What percentage of the height of the line is taken by the item? Default 0.65


Smallest time the calendar can zoom to in milliseconds. Default 60 * 60 * 1000 (1 hour)


Largest time the calendar can zoom to in milliseconds. Default 5 * 365.24 * 86400 * 1000 (5 years)


How many pixels we can drag the background for it to be counted as a click on the background. Defualt: 3


Can items be dragged around? Can be overridden in the items array. Defaults to true


Can items be moved between groups? Can be overridden in the items array. Defaults to true


Can items be resized? Can be overridden in the items array. Accepted values: false, "left", "right", "both". Defaults to "right". If you pass true, it will be treated as "right" to not break compatibility with versions 0.9 and below.


Append a special .rct-drag-right handle to the elements and only resize if dragged from there. Defaults to false


Stack items under each other, so there is no visual overlap when times collide. Defaults to false.


Zoom in when scrolling the mouse up/down. Defaults to false


Normally tapping (touching) an item selects it. If this is set to true, a tap will have the same effect, as selecting with the first click and then clicking again to open and send the onItemClick event. Defaults to false.


With what step to display different units. E.g. 15 for minute means only minutes 0, 15, 30 and 45 will be shown.


  second: 1,
  minute: 1,
  hour: 1,
  day: 1,
  month: 1,
  year: 1

onItemMove(itemId, dragTime, newGroupOrder)

Callback when an item is moved. Returns 1) the item's ID, 2) the new start time and 3) the index of the new group in the groups array.

onItemResize(itemId, time, edge)

Callback when an item is resized. Returns 1) the item's ID, 2) the new start or end time of the item 3) The edge that was dragged (left or right)

onItemSelect(itemId, e)

Called when an item is selected. This is sent on the first click on an item.

onItemClick(itemId, e)

Called when an item is clicked. Note: the item must be selected before it's clicked... except if it's a touch event and itemTouchSendsClick is enabled.

onCanvasClick(groupId, time, e)

Called when an empty spot on the canvas was clicked. Get the group ID and the time as arguments. For example open a "new item" window after this.

onCanvasDoubleClick(groupId, time,e )

Called when an empty spot on the canvas was double clicked. Get the group ID and the time as arguments.

onItemDoubleClick(itemId, e)

Called when an item was double clicked

onItemContextMenu(itemId, e)

Called when the item is clicked by the right button of the mouse. Note: If this property is set the default context menu doesn't appear

moveResizeValidator(action, itemId, time, resizeEdge)

This function is called when an item is being moved or resized. It's up to this function to return a new version of change, when the proposed move would violate business logic.

The argument action is one of move or resize.

The argument resizeEdge is when resizing one of left or right.

The argument time describes the proposed new time for either the start time of the item (for move) or the start or end time (for resize).

The function must return a new unix timestamp in milliseconds... or just time if the proposed new time doesn't interfere with business logic.

For example, to prevent moving of items into the past, but to keep them at 15min intervals, use this code:

function (action, item, time, resizeEdge) {
  if (time < new Date().getTime()) {
    var newTime = Math.ceil(new Date().getTime() / (15*60*1000)) * (15*60*1000);
    return newTime;

  return time

defaultTimeStart and defaultTimeEnd

Unless overridden by visibleTimeStart and visibleTimeEnd, specify where the calendar begins and where it ends. This parameter expects a Date or moment object.

visibleTimeStart and visibleTimeEnd

The exact viewport of the calendar. When these are specified, scrolling in the calendar must be orchestrated by the onTimeChange function.

onTimeChange(visibleTimeStart, visibleTimeEnd, updateScrollCanvas)

A function that's called when the user tries to scroll. Call the passed updateScrollCanvas(start, end) with the updated visibleTimeStart and visibleTimeEnd to change the scroll behavior, for example to limit scrolling.

Here is an example that limits the timeline to only show dates starting 6 months from now and ending in 6 months.

// this limits the timeline to -6 months ... +6 months
var minTime = moment().add(-6, 'months').valueOf()
var maxTime = moment().add(6, 'months').valueOf()

function (visibleTimeStart, visibleTimeEnd, updateScrollCanvas) {
  if (visibleTimeStart < minTime && visibleTimeEnd > maxTime) {
    updateScrollCanvas(minTime, maxTime)
  } else if (visibleTimeStart < minTime) {
    updateScrollCanvas(minTime, minTime + (visibleTimeEnd - visibleTimeStart))
  } else if (visibleTimeEnd > maxTime) {
    updateScrollCanvas(maxTime - (visibleTimeEnd - visibleTimeStart), maxTime)
  } else {
    updateScrollCanvas(visibleTimeStart, visibleTimeEnd)

onTimeInit(visibleTimeStart, visibleTimeEnd)

Called when the calendar is first initialised

onBoundsChange(canvasTimeStart, canvasTimeEnd)

Called when the bounds in the calendar's canvas change. Use it for example to load new data to display. (see "Behind the scenes" below)


All children of the Timeline component will be displayed above the sidebar. Use this to display small filters or so.


How can I have items with different colors?

Items have a "className" parameter. For example if you have "standard" items and "analysis" items, then you can just add an "analysis" class for your analysis items and then change the css backgroundColor property for them.

You will then need to override the default CSS rule:

.react-calendar-timeline .rct-items .rct-item.analysis {
  backgroundColor: #68efad;

Behind the scenes

The timeline is built with speed, usability and extensibility in mind.

Speed: The calendar itself is actually a 3x wide scrolling canvas of the screen. All scroll events left and right happen naturally, like scrolling any website. When the timeline has scrolled enough (50% of the invisible surface on one side), we change the "position:absolute;left:{num}px;" variables of each of the visible items and scroll the canvas back. When this happens, the onBoundsChange prop is called.

This results in a visually endless scrolling canvas with optimal performance.

Extensibility and usability: While some parameters (onTimeChange, moveResizeValidator) might be hard to configure, these are design decisions to make it as extensible as possible. If you have recipes for common tasks regarding those parameters, send a PR to add them to this doc.