GeoJSONLayer¶
Sanitized GeoJSON layer for Map (or standalone alternative list).
| Import | from hedron import GeoJSONLayer |
| Distribution | hedron |
| Backend activity | No |
| Normal render mode | RenderMode.FRAGMENT |
Live demo¶
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 GeoJSONLayer
component = GeoJSONLayer({'type':'FeatureCollection','features':[]})
Use GeoJSONLayer as the validated geojson= input to Map; it is a data helper rather than a renderable node.
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¶
| Parameter | Type | Meaning |
|---|---|---|
geojson |
Mapping[str, object] | None |
GeoJSON mapping or GeoJSONLayer (feature-capped). |
max_features |
int |
Maximum GeoJSON features rendered. Default: 500. |
Composition and backend behavior¶
Keep GeoJSONLayer 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.
GeoJSONLayer 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.