D3 Calendar Heatmap

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

TODO

• Enable/disable tooltip
• Editing of tooltip text
• Editing of the cell gradient colours
• Add optional callback for click events on the day cells
• Add project to bower
• Remove example and vendor folders to separate gh-pages branch [in progress]

Configuration

Property	Usage	Default	Required
data	Chart data	none	yes
selector	DOM selector to attach the chart to	body	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	'contributions'	no
legendEnabled	Option to render a legend	true	no
onClick	callback function on day click events (see example below)	null	no

Dependencies

• d3.js
• moment.js

Usage

1: Add d3.js and moment.js

2: Include calendar-heatmap.js and calendar-heatmap.css <link rel="stylesheet" type="text/css" href="path/tocalendar-heatmap.css"> <script src="path/to/calendar-heatmap.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: valid Javascript date object,
  count: Number
}];
var chart1 = calendarHeatmap()
              .data(chartData)
              .selector('#chart-one')
              .colorRange(['#D8E6E7', '#218380'])
              .tooltipEnabled(true)
              .onClick(function (data) {
                console.log('onClick callback. Data:', data);
              });
chart1();  // render the chart

Pull Requests and issues

...are very welcome!