LayerFilter - manywidgets

A checkbox legend that filters a lonboard layer by category (writes filter_categories via the layer’s DataFilterExtension).

Import¶

from manywidgets.lonboard import LayerFilter

Example¶

from lonboard import Map, ScatterplotLayer
from lonboard.layer_extension import DataFilterExtension
from manywidgets import Column
from manywidgets.lonboard import LayerFilter

layer = ScatterplotLayer.from_geopandas(
    gdf,
    extensions=[DataFilterExtension(category_size=1)],
    get_filter_category=bands,          # one category per row
    filter_categories=[0, 1, 2, 3],
)
m = Map(layer, basemap=None)
legend = LayerFilter(layer, categories=[[0, "Shallow"], [1, "Mid"], [2, "Deep"], [3, "Very deep"]], label="Depth")

Column(legend, m)

API¶

Trait	Type	Default	Description
`layer`	Instance	—	The lonboard layer to filter.
`categories`	List	—	Scalars or [value, label] pairs, one per category.
`value`	List	—	Currently-enabled category values.
`label`	Unicode	`'Filter'`	Legend heading.
`widget_id`	Unicode	`''`	Stable unique id used for cross-widget linking (auto-assigned).