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Charts

Free

Expanded Stacked Area Chart

Three series stacked to 100% at every month, so each band reads as a share of the whole rather than an amount. Built for Solid on TanStack Charts.

Framework
Charting library

Preview

Preview width

About

Use it when the mix matters more than the size: device share, plan mix, traffic sources. Every month fills the full height, so a band that widens is gaining share even if its count fell. For the amounts themselves, use the stacked area. For one moment's split, use a pie.

Other, mobile and desktop stack from the bottom up, each a smooth curve in its own color. Other is filled at 10% so the two main series stand out, and the value axis is left off, since every month ends at the same height.

Installation

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Usage

import { ChartAreaExpanded } from "@/components/charts/chart-area-expanded";
<ChartAreaExpanded />

Customize

  • The rows carry three values per month, desktop, mobile and other, each with a chartConfig entry on --chart-1 to --chart-3.
  • stackRowsY with offset: "normalize" turns amounts into shares; its order lists the bands from the bottom up. Two areaY marks draw them: Other alone at 10%, the rest at 40%.
  • The shares run from 0 to 1 on the kit's chartLinearScale, its axis hidden; the grid lines still mark the quarters of the stack.
  • ChartTooltipContent takes indicator: "line", so each row starts with a short bar in its band's color, and valueKey: "visitors", so it shows counts rather than shares.

FAQ

How is it different from the stacked area chart?

The stacked area chart shows amounts: its top edge is the total. This one divides each month by its total, so the top edge is always 100% and each band is a share. A band can grow here while its count falls, if the others fall faster.

What makes every month fill to 100%?

offset: "normalize" in stackRowsY's options rescales every month's stack to run from 0 to 1, so each row's y1 and y2 are shares. The kit's chartLinearScale then reads 0 to 1 from those rows.

How do I label the shares on the side?

Show the y axis's labels and give its ticks a format that multiplies by 100 and adds a percent sign. ticks.values of [0, 0.5, 1] keeps it to three labels.

What does the tooltip show, counts or shares?

Counts. The tooltip options set valueKey: "visitors", so each row reads its raw count from the data; without it, the rows would show each band's share as a fraction. For a percentage, give ChartTooltipContent a formatter that divides each value by the month's total.

Why is the Other band so faint?

It's the least important series, so it's filled at 10% where mobile and desktop use 40%, and the eye goes to the two that matter. It has an areaY mark of its own for that: raise its fillOpacity, or drop the series, if it's a real category for you.

How do I change the order of the bands?

stackRowsY's order: ["other", "mobile", "desktop"] lists the bands from the bottom up. Put the series people compare most at the bottom, where its edge is a straight baseline.

API Reference

ChartContainer

<div> data-slot="chart"

PropType
configChartConfig

Each series' label, icon and color, read by the tooltip and the legend.

definitionChartDefinition

The chart: defineChart(spec, chartTooltip()), its data, marks, scales and axes, and the tooltip's focus.

ariaLabelstring

The chart's accessible name: the card's title.

ariaDescription?string

The chart's accessible description.

class?string

The container's size: aspect-auto h-[250px] w-full, mx-auto aspect-square max-h-[250px]. It's aspect-video by default.

children?JSX.Element

What sits under the chart inside the container: a ChartLegend.

tooltip?ChartTooltipContentProps | false

ChartTooltipContent's props (indicator, hideLabel, formatter…) for the default body, or false for TanStack's own tooltip body.

Type
ChartTooltipContentProps | false
renderTooltip?(context: ChartTooltipBodyRenderContext) => JSX.Element

A whole tooltip body of your own, in place of ChartTooltipContent: it gets the focused points (each with its datum, group and color). Read the context's fields in JSX (context.points), so Solid tracks them.

Type
(context: ChartTooltipBodyRenderContext) => JSX.Element
defaultIndex?number

The category whose tooltip shows before any pointer, as Recharts' defaultIndex.

height?number

A fixed height in pixels for the chart, in place of the container's.

aspectRatio?number

A width-to-height ratio for the chart, in place of the container's height.

initialWidth?number

The width the chart renders at before it's measured.

onFocusChange?(point: ChartPoint | null) => void

Called as the focused point changes: a pointer, a key or a tap.

Type
(point: ChartPoint | null) => void
onFocusGroupChange?(points: readonly ChartPoint[]) => void

Called with every point at the focused category (a stacked or grouped chart's).

Type
(points: readonly ChartPoint[]) => void
onSelect?(point: ChartPoint | null) => void

Called when a point is clicked or picked with Enter.

Type
(point: ChartPoint | null) => void
CSS variableType
--color-<key>?color

Each config key's color (its theme color in light and dark), set on the container: the marks paint with var(--color-<key>).

ChartTooltipContent

<div>

PropType
pointsreadonly ChartPoint[]

The focused points, from the tooltip's context. ChartContainer passes them to its default body; a body of your own passes its context's.

indicator?"dot" | "line" | "dashed"

The indicator's shape beside each row.

Type
"dot" | "line" | "dashed"
Default
"dot"
hideLabel?boolean

Hides the label above the rows (the focused category).

Default
false
hideIndicator?boolean

Hides each row's color indicator.

Default
false
label?string

The label's text in place of the focused category, looked up in config.

labelKey?string

The datum field (or config key) the label is read from, looked up in config.

nameKey?string

The datum field (or config key) each row's series is read from: a pie's browser.

valueKey?string

The datum field each row's value is read from, for points that carry geometry rather than values (a pie's, from pie()).

color?string

One indicator color for every row, in place of each series' own.

labelFormatter?(label: string, points: readonly ChartPoint[]) => string

Formats the label (the config's label or the category), with the rows' points: a date written out, a unit.

Type
(label: string, points: readonly ChartPoint[]) => string
formatter?(value: number | string, name: string, item: ChartTooltipItem, index: number) => JSX.Element

A row's content in place of its indicator, name and value, as shadcn's formatter: a unit, a currency, a total row.

Type
(value: number | string, name: string, item: ChartTooltipItem, index: number) => JSX.Element
class?string

Classes for the tooltip's card.

ChartLegend

<div>

PropType
config?ChartConfig

The series to list: the container's config by default.

keys?readonly string[]

The series keys to list, in order: every key with a color by default.

hideIcon?boolean

Hides each series' icon (from config), leaving its color swatch.

Default
false
verticalAlign?"top" | "bottom"

Above the chart or under it.

Type
"top" | "bottom"
Default
"bottom"
class?string

Classes for the legend's row.

ChartConfig

KeyType
label?string

The series' name in the tooltip and the legend.

icon?Component

An icon beside its name in the legend and the tooltip (a lucide-solid icon).

color?string

Its color in both themes: a token (var(--chart-1)) or any CSS color.

theme?{ light: string; dark: string }

A color for each theme, in place of color.

Helpers

ExportType
chartTooltip?(settings?: ChartTooltipSettings) => ChartDefinitionOptions

defineChart's second argument for a chart with a tooltip: what a pointer or a key focuses (group-x, each category's series, by default), the focus ring, and the host ChartContainer draws its body in.

Type
(settings?: ChartTooltipSettings) => ChartDefinitionOptions
chartTheme?ChartTheme

defineChart's theme in the site's tokens: the text, the grid and the palette (--chart-1 to --chart-5).

chartColors?(config: ChartConfig, keys?: readonly string[]) => { domain: string[]; range: string[] }

defineChart's color: each series key (in config order, or keys') painted var(--color-<key>), for marks with a color channel.

Type
(config: ChartConfig, keys?: readonly string[]) => { domain: string[]; range: string[] }
chartLinearScale?() => LinearScale

A value axis drawn as Recharts draws its default one: zero in the domain, five nice ticks. Pass it as a factory: y: { scale: chartLinearScale }.

Type
() => LinearScale
curveNatural?CurveFactory

D3's natural curve, for a smooth line or area: curve: d3Curve(curveNatural).

curveStep?CurveFactory

D3's step curve, for a line or area that holds each value: curve: d3Curve(curveStep).

curveMonotoneX?CurveFactory

D3's monotone curve, smooth without overshooting a point: curve: d3Curve(curveMonotoneX).

curveLinearClosed?CurveFactory

D3's closed linear curve: a radar's polygon (curve: curveLinearClosed on radialLine and radialArea).

useChart?() => { config: ChartConfig }

The config of the ChartContainer around a component of your own (a custom tooltip body or legend).

Type
() => { config: ChartConfig }
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