D3 Calendar Heatmap Mini

This code was originally forked from https://github.com/DKirwan/calendar-heatmap and modified. This serves to publish the package to npm as calendar-heatmap-mini along with a few key differences.

Key Differences

• Option for singleSelection thanks to @remyvhw.
• npm installable as well as importable as a module.
• Update to the latest [email protected]
  • Trim down to specific d3 packages.
• Data is auto initialized if none is presented.
• When updating the same instance of a heatmap, previous max size is not used.
• Use SVG text for tooltips.
• Move into a non-forked version of the repository.
  • Rework project structure into the appropriate name (calendar-heatmap-mini).

A d3.js heatmap representing time series data. Inspired by Github's contribution chart.

Configuration

Property	Usage	Default	Required
data	Chart data	none	no
selector	DOM selector to attach the chart to	body	no
max	Maximum count	max found in data	no
startDate	Date to start heatmap at	1 year ago	no
colorRange	Minimum and maximum chart gradient colors	['#D8E6E7', '#218380']	no
tooltipEnabled	Option to render a tooltip	true	no
tooltipUnit	Unit to render on the tooltip, can be object for pluralization control	'contributions'	no
legendEnabled	Option to render a legend	true	no
onClick	callback function on day click events (see example below)	null	no
singleSelection	Option to only be able to select a single date	false	no
locale	Object to translate every word used, except for tooltipUnit	see below	no

Default locale object

{
    months: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
    days: ['S', 'M', 'T', 'W', 'T', 'F', 'S'],
    No: 'No',
    on: 'on',
    Less: 'Less',
    More: 'More'
}

Dependencies

• d3.js
• moment.js

Usage

Without npm

1: Add d3.js and moment.js

2: Include calendar-heatmap-mini.js and calendar-heatmap-mini.css.

<link rel="stylesheet" type="text/css" href="path/tocalendar-heatmap-mini.css">
<script src="path/to/calendar-heatmap-mini.js"></script>

3: Format the data so each array item has a date and count property. As long as new Date() can parse the date string it's ok. Note - there all data should be rolled up into daily bucket granularity.

4: Configure the chart and render it

// chart data example
var chartData = [{
  date: new Date(),
  count: 100
}];

var chart1 = calendarHeatmap()
              .data(chartData)
              .selector('#chart-one')
              .colorRange(['#D8E6E7', '#218380'])
              .tooltipEnabled(true)
              .onClick(function (data) {
                console.log('onClick callback. Data:', data);
              });

// render the chart
chart1();

With npm

1: Add package dependency.

npm install calendar-heatmap-mini --save

2. Import however desired.

import CalendarHeatMap from 'calendar-heatmap-mini'

3. Configure and render the chart.

import CalendarHeatMap from 'calendar-heatmap-mini'

// chart data example
var chartData = [{
  date: new Date(),
  count: 100
}];

const chart1 = new CalendarHeatMap()
              .data(chartData)
              .selector('#chart-one')
              .colorRange(['#D8E6E7', '#218380'])
              .tooltipEnabled(true)
              .onClick(function (data) {
                console.log('onClick callback. Data:', data);
              });

// render the chart
chart1();

Control Unit Pluralization

var chart1 = calendarHeatmap()
              .data(chartData)
              .tooltipUnit(
                [
                  {min: 0, unit: 'contribution'},
                  {min: 1, max: 1, unit: 'contribution'},
                  {min: 2, max: 'Infinity', unit: 'contributions'}
                ]
              );
chart1();  // render the chart

Pull Requests and Issues

...are very welcome!