How do I create a bubble chart in JavaScript?

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

Why does my bubble 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.

Cartesian

Bubble

type: 'bubble'

Scatter where the marker radius encodes a third value (z), using a square-root scale so area is proportional to z.

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

Live

Bubble

Edit · JSON

Data format

[[x, y, z]] · { x, y, z, name? }

Data shape

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

data: [
  [2, 35, 12],
  [4, 52, 20],
  [8, 75, 34]
]

Example

import KatuCharts from 'katucharts.js';

KatuCharts.chart('container', {
  chart: { type: 'bubble' },
  series: [{ name: 'Teams', data: [[2, 35, 12], [4, 52, 20], [8, 75, 34]] }]
});

Type-specific options

Option	Description
`sizeBy`	'area' (default) or 'width'.
`minSize / maxSize`	Bubble size bounds (px or '8%').
`zMin / zMax / zThreshold`	Z-domain bounds and negative threshold.
`displayNegative / sizeByAbsoluteValue`	Show negative-z bubbles / size by \|z\|.

Variations

Size legend

Show each size as its own reference bubble next to its value (bubbleLegend.layout: 'separate') so readers can decode bubble sizes.

KatuCharts.chart('container', {
  chart: { type: 'bubble' },
  legend: {
    enabled: true, align: 'center', verticalAlign: 'bottom',
    bubbleLegend: { enabled: true, layout: 'separate', labels: { format: '{value}' } }
  },
  series: [{ name: 'Headcount', data: [[2, 35, 12], [4, 52, 20], [8, 75, 34]] }]
});

Size legend on the side

Place the separate size bubbles in a vertical legend on the right — the same key also works at the bottom or left.

KatuCharts.chart('container', {
  chart: { type: 'bubble' },
  legend: {
    layout: 'vertical', align: 'right', verticalAlign: 'middle',
    bubbleLegend: { enabled: true, layout: 'separate' }
  },
  series: [{ name: 'Headcount', data: [[2, 35, 12], [4, 52, 20], [8, 75, 34]] }]
});

Named & colored bubbles

Color bubbles per point and label each with its name.

KatuCharts.chart('container', {
  chart: { type: 'bubble' },
  series: [{
    colorByPoint: true,
    dataLabels: { enabled: true, format: '{point.name}' },
    data: [
      { x: 2, y: 35, z: 12, name: 'Alpha' },
      { x: 4, y: 52, z: 20, name: 'Bravo' }
    ]
  }]
});

Common errors

Why does my bubble 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 bubble chart in JavaScript?: Install with `npm install katucharts.js`, then call KatuCharts.chart(container, { chart: { type: 'bubble' }, series: [...] }).
Why does my bubble 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.