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EmptyLayoutComponent

Minimal placeholder component. Renders a single empty html.Div. Useful when you need a WeaverletComponent slot in the DAG but no actual content. E.g. as a not-found page that renders nothing, or as a placeholder during early development.

from weaverlet import EmptyLayoutComponent

Signature​

class EmptyLayoutComponent(WeaverletComponent):

    _empty_div_id = Identifier()

    def __init__(self, name: str = "unnamed") -> None: ...

    def get_layout(self) -> "dash.html.Div": ...

get_layout returns:

html.Div(id=self._empty_div_id)

— an empty <div> with an auto-generated ID. No children, no callbacks, no signals.

When to use it​

  • Quiet 404: SimpleRouterComponent(not_found_page_component=EmptyLayoutComponent()) produces a blank page for unmatched URLs instead of a "not found" message.
  • Slot placeholder during scaffolding: insert one anywhere you'll later replace with a real component.
  • Hidden mount: under keep_mounted=True, an empty route that exists only to keep some auxiliary state alive.

Example​

from weaverlet import (
    WeaverletApp, WeaverletComponent, SimpleRouterComponent, EmptyLayoutComponent,
)
from dash import html

class Home(WeaverletComponent):
    def get_layout(self): return html.Div("Home")

router = SimpleRouterComponent(
    routes={"/": Home()},
    not_found_page_component=EmptyLayoutComponent(),     # quiet 404
)
WeaverletApp(root_component=router).app.run()

See also​