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              <button onClick="createOrUpdateSparklines()">Update</button>
<div id="example"></div>
              @import url(https://fonts.googleapis.com/css?family=Montserrat|Roboto+Slab);

* {
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;

.category__label {
  font-family: 'Roboto Slab';
  text-transform: none;

.category {
    display: block;
    padding: 5px;

  .category__value {
    font-style: normal;
    text-transform: none;
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    width: 30px;
    padding: 0 5px;

  .category__value {
    width: 50px;
    opacity: 0.6;

  .category__label {
    text-align: right;

  .sparkline__tooltip {
    font-size: 0.7em;
              function generateRandomData(seriesCount, datesCount) {
  return d3.range(seriesCount).map(function (d) {
    return {
      name: '#' + d,
      values: d3.range(datesCount).map(function (d) {
        return {
          label: d,
          value: Math.random(d)

var sparklinesConfig = {
  height: 20,
  width: 180

// Sparklines configuration
var sparklines = d3.toucan.sparklines()

function createOrUpdateSparklines() {
  var exampleElement = d3.selectAll('#example')

  // Adding some sample parents elements
  var categoriesSelection = exampleElement.selectAll('.category')
    .data(generateRandomData(10, 30), function(cat) {
      return cat.name;

  var newCategories = categoriesSelection
    .classed('category', true);

    .classed('category__label', true)

    .text(function (d) {
      return d.name;

  // Creating blocks that will contain sparklines
  var newSparklinesSelection = newCategories
    .classed('sparkline', true)
    .attr('height', sparklinesConfig.height)
    .attr('width', sparklinesConfig.width)

  // Binding data to them
  var sparklinesSelection = categoriesSelection.select('.sparkline')
    .datum(function (d) {
      return d.values;

    .classed('category__value', true)

  var valueFormatter = d3.format('.2p');
    .text(function (d) {
      return valueFormatter(d.values[d.values.length - 1].value);

  // Do the magic!

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