How do I create a area spline chart in JavaScript?

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

Why does my area spline 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

Area Spline

type: 'areaspline'

Area chart with smooth Catmull-Rom interpolation — the filled area of area with the smooth curve of spline.

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

Live

Area Spline

Edit · JSON

Data format

same as line

Data shape

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

series: [
  { name: 'Desktop', data: [450, 520, 480, 610, 580] }
]

Example

import KatuCharts from 'katucharts.js';

KatuCharts.chart('container', {
  chart: { type: 'areaspline' },
  series: [{ name: 'Desktop', data: [450, 520, 480, 610, 580] }]
});

Type-specific options

Option	Description
`(inherits area + spline options)`	fillOpacity, stacking, smoothing.

Variations

Stacked

Stack the smooth filled series into a cumulative total.

KatuCharts.chart('container', {
  chart: { type: 'areaspline' },
  plotOptions: { areaspline: { stacking: 'normal' } },
  series: [
    { name: 'Desktop', data: [450, 520, 480, 610, 580, 320, 280] },
    { name: 'Mobile', data: [280, 350, 420, 510, 490, 410, 380] }
  ]
});

Common errors

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