`Popover`¶

Native popover or details/summary disclosure.


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

Live demo¶

Popover content appears on activation in the live component.

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 Popover, Text
component = Popover(Text('Details'), label='Info', placement='inline-end', collision='shift')

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

How it works¶

Phase 0.15 surface with the 0.59 logical placement and collision contract. Prefer native HTML semantics and ordinary HTTP actions. placement is expressed in logical block/inline terms so RTL and writing-mode layouts do not need physical left/right assumptions. collision selects the finite fallback strategy: flip, shift, or static.

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¶

Popover(*nodes, children=None, label='Open', mode='popover', placement='block-end', collision='flip', id=None, class_=None, mark=None)

Parameter	Type	Meaning
`nodes`	`NodeLike`	Popover body content.
`children`	`NodeLike \| sequence \| None`	Keyword alternative for generated or declarative child lists.
`label`	`str`	Accessible label text shown to users. Default: `'Open'`.
`mode`	`Literal['popover', 'details']`	Presentation mode for the disclosure surface. Default: `'popover'`.
`placement`	`Literal['block-start', 'block-end', 'inline-start', 'inline-end', 'center']`	Logical placement. Default: `'block-end'`.
`collision`	`Literal['flip', 'shift', 'static']`	Finite collision fallback. Default: `'flip'`.
`id`	`str \| None`	Optional DOM `id`. Default: `None`.
`class_`	`str \| None`	Optional CSS class string. Default: `None`.
`mark`	`str \| None`	Optional stable test mark (`data-hedron-mark`).

Composition and backend behavior¶

Keep Popover 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.

Popover 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 require anchor-positioning support; the static/native placement path remains the 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

Popover¶