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Charts

Free

Line Chart

One series as a smooth line across six months: the lightest way to show which way a single metric is heading, in Vue with TanStack Charts.

Framework
Charting library

Preview

Preview width

About

Pick it when the question is direction: is the metric going up, down or nowhere. A line uses less ink than an area, so it suits small cards and pages with several charts. Add the dots version when each month is a reading people should see, or a bar chart when they compare months.

A smooth curve runs through six monthly values, with horizontal grid lines behind it and three-letter months underneath. There's no value axis and no fill, and the tooltip shows the value without the month above it.

Installation

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Usage

<script setup lang="ts">
import ChartLineSimple from "@/components/charts/chart-line-simple.vue";
</script>
<template>
  <ChartLineSimple />
</template>

Customize

  • One row per month, { month, desktop }. lineY reads x: "month" and y: "desktop"; rename both to plot your own fields.
  • The line's stroke is var(--color-desktop), which ChartContainer sets from chartConfig.desktop (var(--chart-1)). strokeWidth: 2 matches shadcn/ui's weight.
  • The curve option gives the natural shape. Leave it out and lineY draws straight segments, which is the linear version.
  • The y scale is chartLinearScale, Recharts' domain and ticks (0 to 320 here), with grid: true and axis: false. To fix its range, pass a configured scale such as scaleLinear().domain([0, 400]).
  • chartTooltip({ focusRing: true }) turns on focus by month and an active dot on the focused point; ChartContainer's tooltip prop passes { hideLabel: true }, so the tooltip shows the value alone.

FAQ

How do I make the line thicker or dashed?

strokeWidth on lineY sets the weight, 2 here. strokeDasharray: "4 4" dashes it, a common way to set a forecast apart from measured months.

Should I use this or the area chart?

Use the line when the direction matters and the chart sits next to others: it adds the least ink. Use the area when the amount matters, since the fill reads as volume. Both take the same { month, desktop } rows, so switching means swapping lineY for areaY.

Why doesn't the tooltip show the month?

ChartContainer's tooltip prop sets hideLabel: true, as shadcn/ui's example does: the month is already printed under the point. Remove it and the tooltip shows the month above the value.

How do I plot dates instead of month names?

Put a date string in each row and keep x on it. Format the labels with the x axis's ticks: { format } and thin them with tickLabels: { thin: { minGap: 32 } }, as the interactive line chart does for its Apr 10 labels; ticks: { values } picks exact dates instead.

How do I remove the grid lines?

Remove grid: true from the y scale. Its axis is already hidden, so the line then floats on the card with the months below. For lighter guides instead, pass a style: grid: { strokeDasharray: "3 3" }.

How does a screen reader read this chart?

The SVG is an image named by ariaLabel, the card title. Each month the arrow keys land on updates the tooltip, a polite live region, so its value is read out. For context the card doesn't show, pass ariaDescription to ChartContainer.

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.

#default?slot

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

tooltip?(ChartTooltipContentOptions & { class?: string }) | false

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

Type
(ChartTooltipContentOptions & { class?: string }) | false
#tooltip?slot (ChartTooltipBodySlotContext)

A whole tooltip body of your own, in place of ChartTooltipContent: it gets the focused points (each with its datum, group and color). A scoped slot.

Type
slot (ChartTooltipBodySlotContext)
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.

EventType
@focus-change?(point: ChartPoint | null) => void

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

Type
(point: ChartPoint | null) => void
@focus-group-change?(points: readonly ChartPoint[]) => void

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

Type
(points: readonly ChartPoint[]) => void
@select?(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?slot ({ value, item, index })

A row's content in place of its indicator, name and value, as shadcn's formatter: a unit, a currency, a total row. A scoped slot; the row's series key is item.key.

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-vue-next 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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