@freecodecamp/react-calendar-heatmap

React Calendar Heatmap

A calendar heatmap component built on SVG, inspired by github's commit calendar graph. The component expands to size of container and is super configurable. Try it out on CodeSandbox.

Setup

Install the npm module with yarn or npm:

yarn add react-calendar-heatmap

Usage

Import the component:

import CalendarHeatmap from 'react-calendar-heatmap';

Import styles. You can directly import from the module, which requires a CSS loader:

import 'react-calendar-heatmap/dist/styles.css';

A CSS loader is included by default in create-react-app. If you don't have a CSS loader, you can simply copy the stylesheet into a file in your project and import it instead.

To show a basic heatmap from January 1st to April 1st:

<CalendarHeatmap
  startDate={new Date('2016-01-01')}
  endDate={new Date('2016-04-01')}
  values={[
    { date: '2016-01-01', count: 12 },
    { date: '2016-01-22', count: 122 },
    { date: '2016-01-30', count: 38 },
    // ...and so on
  ]}
/>

Props

Name	Type	Description
values	Required, Array of Object	Required array of objects which each have a date property, which can be a Date object, parseable string, or millisecond timestamp. Example: [{ date: '2016-01-01', count: 6 }]
startDate	String, Number, or Date	Start of date range.
endDate	String, Number, or Date	End of date range - a Date object, parseable string, or millisecond timestamp.
showMonthLabels	Boolean	Toggle for removing month labels.
showWeekdayLabels	Boolean	Toggle for removing weekday labels.
showOutOfRangeDays	Boolean	Toggle display of extra days in week that are past endDate and before beginning of range.
horizontal	Boolean	Whether to orient horizontally or vertically. Can be used in combination with numDays/endDate to show just the current month.
gutterSize	Number	Size of gutters relative to squares.
onClick	Function	Callback to invoke when a square is clicked, e.g. (value) => alert(value)
onMouseOver	Function	Callback to invoke when mouse pointer is over a square, e.g. (event, value) => console.log(event, value)
onMouseLeave	Function	Callback to invoke when mouse pointer leaves a square, e.g. (event, value) => console.log(event, value)
titleForValue	Function	Function to determine each square's title attribute, for generating 3rd party hover tooltips (may also need to configure tooltipDataAttrs). Example: (value) => Date is ${value.date}`
tooltipDataAttrs	Object or Function	Set data attributes for all squares, for generating 3rd party hover tooltips. Either an object like { 'data-tooltip': 'tooltip' } or a function like (value) => { return { 'data-tooltip': 'Tooltip: ' + value } }
classForValue	Function	Callback for determining CSS class to apply to each value, e.g. (value) => (value.count > 0 ? 'blue' : 'white').
monthLabels	Array of String	An array with 12 strings representing the text from January to December, e.g. ['01', '02', ..., '12']
weekdayLabels	Array of String	An array with 7 strings representing the text from Sunday to Saturday
transformDayElement	Function	A function to further transform generated svg element for a single day. Can be used to attach event handlers, add tooltips and more. Example: (element, value, index) => React.cloneElement(element, { title: value.date }).

Configuring colors

To use the color scale shown in the live demo based on the github contribution graph, you can set the classForValue prop, a function that determines which CSS class to apply to each value:

<CalendarHeatmap
  values={[
    { date: '2016-01-01', count: 1 },
    { date: '2016-01-03', count: 4 },
    { date: '2016-01-06', count: 2 },
    // ...and so on
  ]}
  classForValue={(value) => {
    if (!value) {
      return 'color-empty';
    }
    return `color-scale-${value.count}`;
  }}
/>

Then you use CSS to set colors for each class:

.react-calendar-heatmap .color-scale-1 { fill: #d6e685; }
.react-calendar-heatmap .color-scale-2 { fill: #8cc665; }
.react-calendar-heatmap .color-scale-3 { fill: #44a340; }
.react-calendar-heatmap .color-scale-4 { fill: #1e6823; }

Contributing

Take a look at CONTRIBUTING.md to see how to develop on react-calendar-heatmap.

License

react-calendar-heatmap is Copyright © 2016 PatientsLikeMe, Inc. and is released under an MIT License. See COPYING for details.

Changelog

v1.1.0

• Add React 17 and 18 to allowed peerDependencies