`LineChart`¶

Plot one x/y series from row mappings with an accessible fallback.


Import	`from hedron import LineChart`
Distribution	`hedron[charts]`
Backend activity	No
Normal render mode	`RenderMode.FRAGMENT`

Live demo¶

Monthly revenueRevenue rose from January through June.

The preview is a local docs simulation (not a running Hedron server). Interactive demos show a “Simulated HTMX” trace when applicable.

Install the optional provider before importing this component:

pip install "hedron[charts]>=0.1.0,<0.2"

Basic use¶

from hedron import LineChart

component = LineChart(rows, x='month', y='revenue', title='Monthly revenue', description='Revenue rose from January through June.')

Compose under Page for full documents, or return from a fragment route for HTMX swaps.

How it works¶

LineChart prefers the Matplotlib adapter when installed and otherwise produces a reviewed accessible SVG plus a redacted table fallback. Numeric and categorical x values are supported.

This component's core behavior is server-rendered HTML and does not require a browser runtime. The preview is ordinary semantic HTML, so keyboard, form, link, and disclosure behavior comes from the platform.

Constructor and parameters¶

LineChart(data, *, x, y, title, description=None, alt=None, waiver=None, limits=None)

Parameter	Type	Meaning
`data`	`Sequence[Mapping]`	Bounded rows.
`x / y`	`str`	Source field names.
`title`	`str`	Required chart title.
`description / alt`	`str \| None`	Text equivalents.
`waiver`	`str \| None`	Reviewed accessibility exception.
`limits`	`VisualizationLimits \| None`	Complexity bounds.

Composition and backend behavior¶

Keep LineChart at the smallest semantic boundary. Fragment routes should return only the replaced region and preserve stable target IDs across success, validation, empty, loading, and error responses.

This component is primarily presentational; keep any mutation on an explicit action or component route.

Accessibility¶

Supply a conclusion-oriented description and keep the tabular fallback available to users who cannot perceive the plot.

Security¶

Escaping and SafeUrl / TrustedHtml are framework concerns; authorization and data exposure remain application code. Redact secrets before rendering.

Common mistakes¶

Bound data and never insert raw labels into active SVG or bypass the accessibility contract.
Do not copy docs-preview JavaScript into an application server.

Testing¶

from hedron import RenderMode, render

result = render(component, mode=RenderMode.FRAGMENT)
assert result.html
assert not result.diagnostics

All component demos · Built-in API · Testing

LineChart¶