How do I create a gauge chart in JavaScript?

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

Why does my gauge 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.

Gauge / Polar

Gauge

type: 'gauge'

Angular speedometer-style gauge with a needle. Supports plot bands for colored ranges.

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

Live

Gauge

Edit · JSON

Data format

[{ y: number }] (single value), yAxis { min, max }

Data shape

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

data: [{ y: 72 }]

Example

import KatuCharts from 'katucharts.js';

KatuCharts.chart('container', {
  chart: { type: 'gauge' },
  yAxis: { min: 0, max: 100 },
  series: [{ name: 'Load', data: [72] }]
});

Type-specific options

Option	Description
`yAxis.min / yAxis.max`	Gauge range (required).
`yAxis.plotBands`	Colored arc segments { from, to, color }.
`dial / pivot / pane / wrap`	Needle, hub, arc range and wrap behavior.

Variations

Colored plot bands

Shade the dial into zones with yAxis.plotBands.

KatuCharts.chart('container', {
  chart: { type: 'gauge' },
  yAxis: {
    min: 0, max: 100,
    plotBands: [
      { from: 0,  to: 60,  color: '#2F6B5E' },
      { from: 60, to: 85,  color: '#C9762B' },
      { from: 85, to: 100, color: '#B43417' }
    ]
  },
  series: [{ name: 'Load', data: [72] }]
});

Common errors

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