GitHub - team-centric-software/simple-d3-heatmap: A javascript module to create heatmap calendars

<script src="https://cdn.jsdelivr.net/npm/d3@5.9.2/dist/d3.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@tcs-open-source/simple-d3-heatmap@latest/simple-d3-heatmap.min.js"></script>

<!-- Create div to append the calendar to -->
<div id="calendarContainer"></div>

<script>
	// time series data with the format `timestamp: value` as object
	const data = {
		1546254000000: 29,
		1546257600000: 41,
		1546261200000: 50,
		1546264800000: 13,
		1546268400000: 5,
	};

	// create a new instance of SimpleD3Heatmap
	const heatmap = new SimpleD3Heatmap();
	
	// create a weekly calendar which we will append to `calendarContainer` with the data `data`
	heatmap.weekly("calendarContainer", data);
</script>

<!-- Styling for the Tooltip -->
<style>
	.d3-calendar-tooltip {
		background-color: white;
		border: 2px solid #111;
		color: black;
		width: max-content;
		padding: 3px 12px;
	}

	.d3-calendar-tooltip::after {
		box-sizing: border-box;
		display: inline;
		font-size: 12px;
		width: 100%;
		line-height: 1;
		color: #111;
		content: "\25BC";
		position: absolute;
		left: 0px;
		top: 24px;
		text-align: center;
	}
</style>

const heatmap = new SimpleD3Heatmap({
	minColor: "#ECF5E2", // lowest datapoint's color in the heatmap - e.g. rgb(0, 255, 0) or #00ff00
	maxColor: "#222081", // highest datapoint's color in the heatmap - e.g. rgb(255, 255, 0) or #ffff00
	colorMode: 2, // switches between color scales (1: linear, 2: sqrt and 3: cubehelix)
	
	gutterSize: 0.1, // distance inbetween the squares (range: 0-1)
	outerSize: 0.35, // distance inbetween axis x, y and the squares
	scale: 0.8, // scale of the heatmap
	
	showLines: false, // show the axis line
	showTicks: true, // show the axis ticks
	locale: "de-DE", // defines the format of the date in the axis
	dayNameLength: "short", // style of the displayed weekday, options => long: "Friday", short: "Fri", narrow: "F" (uses locale)
	showMonth: true, // displays the months (uses locale)
	includeWeekend: true, // include the weekend in weekly calendar or only monday till friday?

	tooltipClass: "d3-calendar-tooltip", // class of the tooltip
	mobileViewPx: 1200, // at which width change to mobileview?
	enableAnimations: true, // enable animations when rendering calendar?
})

{
	timestamp: value,
	...
}