How do I create a treemap chart in JavaScript?

Install with `npm install katucharts.js`, then call KatuCharts.chart(container, { chart: { type: 'treemap' }, series: [...] }).

Why does my treemap chart render as a line chart?

The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type " ", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.

Why do I get "Cannot read properties of null (reading 'appendChild')"?

The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.

Why is the chart rendering with zero height?

The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.

Pie / Hierarchical

Treemap

type: 'treemap'

Rectangles sized by value. Supports tiling algorithms, hierarchical levels and drill-to-node.

Edit the JSON on the right and press Run (or ⌘/Ctrl + Enter) — data, titles, categories and colors all update live.

Live

Treemap

Edit · JSON

Data format

{ name, value, color? } · { id, parent, name, value }

Data shape

The JSON you pass inside the chart — drop it straight into your series.

data: [
  { name: 'Media', value: 80 },
  { name: 'Docs', value: 45 },
  { name: 'Code', value: 60 }
]

Example

import KatuCharts from 'katucharts.js';

KatuCharts.chart('container', {
  chart: { type: 'treemap' },
  series: [{
    data: [
      { name: 'Media', value: 80 },
      { name: 'Docs', value: 45 },
      { name: 'Code', value: 60 }
    ]
  }]
});

Type-specific options

Option	Description
`layoutAlgorithm`	'squarified' \| 'binary' \| 'dice' \| 'slice' \| 'sliceDice'.
`levels`	Per-level styling array.
`colorByPoint / allowDrillToNode`	Unique color per item / click to drill in.

Variations

Drill to node

Nested id/parent data with allowDrillToNode — click a parent to zoom in.

KatuCharts.chart('container', {
  chart: { type: 'treemap' },
  series: [{
    allowDrillToNode: true, colorByPoint: true,
    data: [
      { id: 'media', name: 'Media' },
      { id: 'm1', parent: 'media', name: 'Video', value: 48 },
      { id: 'm2', parent: 'media', name: 'Audio', value: 22 }
    ]
  }]
});

Common errors

Why does my treemap chart render as a line chart?: The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
Why do I get "Cannot read properties of null (reading 'appendChild')"?: The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
Why is the chart rendering with zero height?: The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.

FAQ

How do I create a treemap chart in JavaScript?: Install with `npm install katucharts.js`, then call KatuCharts.chart(container, { chart: { type: 'treemap' }, series: [...] }).
Why does my treemap chart render as a line chart?: The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
Why do I get "Cannot read properties of null (reading 'appendChild')"?: The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
Why is the chart rendering with zero height?: The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.

Common options (color, visible, marker, dataLabels, animation, events, zones…) apply to every type — see Configuration → series. See it rendered in the gallery.