`Dialog`¶

Present focused content in a native dialog with an explicit title and close path.


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

Live demo¶

Quarterly reportUpdated 2 minutes ago

Dialog closed.

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 Dialog, Text
component = Dialog('Delete report', Text('This action cannot be undone.'), id='delete-report')

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

How it works¶

Dialog renders a native <dialog> with a level-two title, body region, built-in Close form using the browser's dialog submission method, and an optional actions slot. A button whose data-hedron-dialog-open value is the dialog's #id opens it through the shipped browser module; modal dialogs use showModal(), while modal=False uses show(). Already-open modal dialogs are upgraded to showModal() on boot and after HTMX swaps. The component never treats confirmation as authorization.

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¶

Dialog(title, *nodes, children=None, open=False, modal=True, id=None, element_id=None)

Parameter	Type	Meaning
`title`	`str`	Required dialog heading text.
`nodes`	`NodeLike`	Positional dialog body content.
`children`	`NodeLike \| sequence \| None`	Keyword body content; combines with positional nodes.
`open`	`bool`	Render the native open attribute initially.
`modal`	`bool`	Browser-module intent exposed as data-modal.
`id`	`str \| None`	Stable ID for a trigger and focus restoration.
`element_id`	`str \| None`	Compatibility alias for id.

Composition and backend behavior¶

Keep Dialog 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.

Dialog participates in interaction markup. Pair it with an explicit @app.action POST (and CSRF) when the control mutates state.

Accessibility¶

Open it from a clearly labelled trigger, place initial focus deliberately, support Escape and the Close control, and restore focus to the trigger when it closes.

Security¶

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

Common mistakes¶

The open attribute alone does not create modal focus trapping or background inertness; use the supported browser module to call showModal().
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

Dialog¶