Dropdowns

Dropdowns

Every filter control in the query editor, and where its options come from.

Five of them ask the knowledge graph what to offer. The rest are fixed lists in the code. This page is the index; the five query backed ones each have their own page.

Populated by SPARQL

Substance Which PFAS chemicals to look for. Shown for Samples. Endpoint sawgraph with no region, federation once a state is picked. Falls back to seven hardcoded PFAS substances.

Material What the sample was taken from. Shown for Samples. Same endpoint switch as Substance. Falls back to six material types.

Industry NAICS codes, as a searchable tree. Shown for Facilities. Endpoint fiokg. Falls back to eight codes covering the prebuilt questions.

Industry counts The facility counts shown on each industry tree node. Endpoint federation. No fallback, and nothing at all until a state is selected.

County Narrows to counties inside the selected state. Endpoint spatialkg. No fallback, on purpose.

All five follow the same shape. A hook in useDiscoveryQueries.ts calls a query builder in templates/regions.ts and runs it through executeSparql(). Results are cached by React Query with staleTime: Infinity, so each one fetches at most once per region per session.

Fixed lists in the code

These never touch an endpoint. Listed here so the coverage above is unambiguous.

Type, the entity a block is about. Samples, Facilities, Surface Water Bodies, Wells. EntityTypeSelector.tsx

Relationship. Near, Downstream of, Upstream from. RelationshipSelector.tsx

Distance, shown only when the relationship is Near. Zero to four miles, which map to S2 cell expansion hops rather than real distances. RelationshipSelector.tsx

State. All fifty are listed, but only the ones in AVAILABLE_STATE_FIPS are selectable. The rest render disabled, which is deliberate: it shows what the graph does not cover yet instead of pretending those states do not exist. RegionSelector.tsx, constants/regions.ts

Water Type. Lake or Pond, Swamp or Marsh, Reservoir. WaterBodyFilters.tsx

Well Source. Illinois Wells and Maine Wells. Each is tied to one state, and picking a source that contradicts the selected state raises a warning. WellFilters.tsx

Basemap, on the map itself. Five tile layers. basemaps.ts

Export. One entry, "As JPG". ExportDropdown.tsx

The two select components

Everything on this page is one of two controls.

FlatSelect is the shared one: a searchable list rendered through a portal, single or multi select, with support for disabled options and a loading state. Every dropdown uses it except one.

HierarchicalSelect is the exception, used only by Industry, because NAICS codes are a hierarchy and a flat list of 5596 of them is unusable.

Filters that are not dropdowns

For completeness, the Samples filter panel also has Min and Max concentration number inputs in ng/L, and an "Include non-detects" checkbox. None of them query anything; they are applied inside the pipeline queries. SampleFilters.tsx