Line Chart

x-h-chart-line draws a line chart from a single reactive configuration object. Multiple series are overlaid on a shared axis. Charts inherit the active theme colors and adapt to light and dark mode automatically.

Usage

Give the chart a container with an explicit height (charts fill their parent). Provide one or more series, each a list of numeric data points, and a matching labels array naming the points along the axis. Use a line chart to show a trend across an ordered sequence. To compare discrete categories use a Bar Chart, and for parts of a whole use a Pie Chart.

API Reference

Component attribute(s)

x-h-chart-line

Attributes

Attribute	Type	Required	Description
data-font-size	xs sm base lg	false	Changes the size of all chart text, such as labels, axis ticks, and the legend. Defaults to xs.

Configuration

Key	Type	Default	Description
series	{ name?, color?, data: number[] }[]	[]	One entry per line. Multiple series are overlaid. For color values, see Colors.
labels	string[]	[]	Label for each data index.
legend	boolean	true	Show the color/label key.
axes	boolean	true	Show the numeric axis ticks and labels.
gridlines	boolean	true	Show gridlines behind the lines.
tooltip	boolean	true	Show a tooltip on hover and emit interaction events.
dataLabels	boolean	false	Draw each point's value next to it.
tickCount	number	5	Target number of numeric axis ticks.
valueFormat	(value) => string	locale number	Formats values in tooltips and numeric axis ticks.
palette	string[]	color-1 to color-9	Chart colors cycled for series without an explicit color. See Colors for more information.
seriesLabel	string	Series {index}	Template naming a series that has no name. {index} is substituted.
tableLabels	{ category? }	English defaults	Column headers of the hidden data table read by screen readers.

Colors

A series color (and the palette entries) is one of the chart colors color-1 to color-12. They paint with the theme's --chart-color-1 to --chart-color-12 variables (see Theme Customization). By default, they map to blue, red, green, orange, purple, teal, pink, indigo, yellow, gray, white and black. The standard color names (red, orange, yellow, green, teal, blue, indigo, purple, pink, gray, white and black) are deprecated. They still work but they will be removed in the next major version.

Accessibility

The chart is exposed to assistive technologies as a figure with a visually-hidden data table of its values, so screen-reader users get the underlying numbers (the visual lines, axes, and legend are marked decorative). It defaults to the accessible name "Line chart". Set an aria-label attribute on the element to give it a more meaningful name.

Events

When tooltip is enabled, hovering and clicking points emit bubbling CustomEvents on the chart element - chart-hover, chart-leave, and chart-click. See the events reference for the shared detail shape.

Data Slots

Slot	Element
chart	x-h-chart-line
chart-svg	The chart drawing
chart-plot	The plot area
chart-segment	The line of a series
chart-point	A data point
chart-label	A value label
chart-legend	The legend
chart-legend-swatch	A legend color swatch
chart-tooltip	The hover tooltip
chart-table	The data table for assistive technologies
chart-empty	The message shown when there is no data

Examples

Basic

<div style="height: 20rem" x-h-chart-line="{ labels: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri'], series: [{ name: 'Visitors', data: [120, 200, 150, 280, 240] }] }"></div>

Multiple series

<div
  style="height: 20rem"
  x-h-chart-line="{
    labels: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri'],
    series: [
      { name: 'Visitors', data: [120, 200, 150, 280, 240] },
      { name: 'Signups', data: [40, 60, 55, 90, 80] }
    ]
  }"
></div>