Filters

Filters: FilterTernary | FilterExpression | null | boolean

Filters can be used to change which features in a layer are rendered. Filters can be applied to a layer by the setLayerFilters method on the Felt controller.

Remarks

The possible operators are:

• lt: Less than

• gt: Greater than

• le: Less than or equal to

• ge: Greater than or equal to

• eq: Equal to

• ne: Not equal to

• cn: Contains

• nc: Does not contain

The allowed boolean operators are:

• and: Logical AND

• or: Logical OR

Example

// a simple filter
felt.setLayerFilters({
  layerId: "layer-1",
  filters: ["AREA", "gt", 30_000],
});

// compound filters can be constructed using boolean logic:
felt.setLayerFilters({
  layerId: "layer-1",
  filters: [["AREA", "gt", 30_000], "and", ["COLOR", "eq", "red"]]
})