Treemap with Drilldown in JavaScript

// Per-level colour palettes. Treemap uses distributed colouring (one colour per
// tile), so a level's palette tints that level's tiles and signals which branch
// you are inside. Drilling back restores the parent palette.
var sectorColors = ['#1565C0', '#2E7D32', '#C62828', '#EF6C00', '#6A1B9A']
var bluePalette = ['#0D47A1', '#1976D2', '#42A5F5', '#90CAF9'] // Technology
var cyanPalette = ['#006064', '#00838F', '#00ACC1', '#4DD0E1'] // Tech > Cloud
var greenPalette = ['#1B5E20', '#388E3C', '#66BB6A'] // Financials
var redPalette = ['#B71C1C', '#E53935', '#EF9A9A'] // Healthcare
var amberPalette = ['#E65100', '#FB8C00', '#FFB74D'] // Energy
var purplePalette = ['#4A148C', '#8E24AA', '#CE93D8'] // Consumer

// Distributed colouring shared by every level.
var distributed = { treemap: { distributed: true, enableShades: false } }

var options = {
  series: [
    {
      data: [
        { x: 'Technology', y: 620, drilldown: 'tech' },
        { x: 'Financials', y: 430, drilldown: 'fin' },
        { x: 'Healthcare', y: 380, drilldown: 'health' },
        { x: 'Energy', y: 290, drilldown: 'energy' },
        { x: 'Consumer', y: 340, drilldown: 'consumer' },
      ],
    },
  ],
  chart: {
    type: 'treemap',
    height: 450,
    toolbar: {
      show: false,
    },
  },
  legend: {
    show: false,
  },
  colors: sectorColors,
  plotOptions: distributed,
  dataLabels: {
    enabled: true,
    style: {
      fontSize: '14px',
    },
  },
  title: {
    text: 'Market Capitalisation by Sector',
    align: 'left',
  },
  subtitle: {
    text: 'Click a sector to drill into its industries, then into companies. Use the breadcrumb to go back.',
    align: 'left',
  },
  drilldown: {
    enabled: true,
    breadcrumb: {
      show: true,
      position: 'top-right',
      rootLabel: 'All Sectors',
      separator: ' / ',
    },
    series: [
      {
        id: 'tech',
        name: 'Technology',
        colors: bluePalette,
        plotOptions: distributed,
        data: [
          { x: 'Cloud', y: 260, drilldown: 'tech-cloud' },
          { x: 'Devices', y: 190 },
          { x: 'Software', y: 120 },
          { x: 'Semiconductors', y: 50 },
        ],
      },
      {
        id: 'tech-cloud',
        name: 'Cloud',
        colors: cyanPalette,
        plotOptions: distributed,
        data: [
          { x: 'Compute', y: 110 },
          { x: 'Storage', y: 80 },
          { x: 'Networking', y: 45 },
          { x: 'Analytics', y: 25 },
        ],
      },
      {
        id: 'fin',
        name: 'Financials',
        colors: greenPalette,
        plotOptions: distributed,
        data: [
          { x: 'Banking', y: 210 },
          { x: 'Insurance', y: 140 },
          { x: 'Payments', y: 80 },
        ],
      },
      {
        id: 'health',
        name: 'Healthcare',
        colors: redPalette,
        plotOptions: distributed,
        data: [
          { x: 'Pharma', y: 200 },
          { x: 'Devices', y: 110 },
          { x: 'Services', y: 70 },
        ],
      },
      {
        id: 'energy',
        name: 'Energy',
        colors: amberPalette,
        plotOptions: distributed,
        data: [
          { x: 'Renewables', y: 160 },
          { x: 'Oil & Gas', y: 90 },
          { x: 'Utilities', y: 40 },
        ],
      },
      {
        id: 'consumer',
        name: 'Consumer',
        colors: purplePalette,
        plotOptions: distributed,
        data: [
          { x: 'Retail', y: 180 },
          { x: 'Food & Beverage', y: 100 },
          { x: 'Apparel', y: 60 },
        ],
      },
    ],
  },
}

var chart = new ApexCharts(document.querySelector('#chart'), options)
chart.render()