`Map`¶

Policy-bounded map with required table alternative.


Import	`from hedron import Map`
Distribution	`hedron`
Backend activity	No
Normal render mode	`RenderMode.FRAGMENT`

Live demo¶

MapPolicy-bounded map with required table alternative.

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

Basic use¶

from hedron import Map

component = Map(center=(37.77,-122.42), zoom=10, markers=())

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

How it works¶

Phase 0.15 surface. Prefer native HTML semantics and ordinary HTTP actions.

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¶

Map(*, center: 'tuple[float, float]' = (0.0, 0.0), zoom: 'float' = 2.0, width: 'int | None' = None, height: 'int | None' = 360, tile_allowlist: 'Sequence[str]' = (), tiles: 'str | None' = None, attribution: 'str' = '', markers: 'Sequence[MarkerSpec | Mapping[str, Any]]' = (), geojson: 'Mapping[str, Any] | GeoJSONLayer | None' = None, max_features: 'int' = 500, id: 'str | None' = None, class_: 'str | None' = None, mark: 'str | None' = None, **kwargs: 'object') -> 'None'

Parameter	Type	Meaning
`center`	`tuple[float, float]`	Map center as `(lat, lon)`. Default: `(0.0, 0.0)`.
`zoom`	`float`	Initial map zoom level. Default: `2.0`.
`width`	`int \| None`	Optional width hint (CSS length or pixels). Default: `None`.
`height`	`int \| None`	Optional height hint (CSS length or pixels). Default: `360`.
`tile_allowlist`	`Sequence[str]`	Allowed tile URL prefixes / hosts. Default: `()`.
`tiles`	`str \| None`	Optional tile URL template (must pass allowlist checks). Default: `None`.
`attribution`	`str`	Map attribution text. Default: `''`.
`markers`	`Sequence[MarkerSpec \| Mapping[str, Any]]`	Marker specs, mappings, or range tick markers. Default: `()`.
`geojson`	`Mapping[str, Any] \| GeoJSONLayer \| None`	GeoJSON mapping or `GeoJSONLayer` (feature-capped). Default: `None`.
`max_features`	`int`	Maximum GeoJSON features rendered. Default: `500`.
`id`	`str \| None`	Optional DOM `id`. Default: `None`.
`class_`	`str \| None`	Optional CSS class string (`class` in HTML). Default: `None`.
`mark`	`str \| None`	Optional stable test mark (`data-hedron-mark`). Default: `None`.

Composition and backend behavior¶

Keep Map 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¶

Keyboard and screen-reader operable; no-JS fallback required where interactive.

Security¶

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

Common mistakes¶

Do not treat client-only hints (geolocation, browser storage) as authorization.
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

Map¶