altair.SelectionParameter

class altair.SelectionParameter(name=Undefined, select=Undefined, bind=Undefined, value=Undefined, **kwds)

SelectionParameter schema wrapper

Mapping(required=[name, select])

Parameters:

nameParameterName

Required. A unique name for the selection parameter. Selection names should be valid JavaScript identifiers: they should contain only alphanumeric characters (or “$”, or “_”) and may not start with a digit. Reserved keywords that may not be used as parameter names are “datum”, “event”, “item”, and “parent”.

selectanyOf(SelectionType, PointSelectionConfig, IntervalSelectionConfig)

Determines the default event processing and data query for the selection. Vega-Lite currently supports two selection types:

• "point" – to select multiple discrete data values; the first value is selected on click and additional values toggled on shift-click.

• "interval" – to select a continuous range of data values on drag.

bindanyOf(Binding, Mapping(required=[]), LegendBinding, string)

When set, a selection is populated by input elements (also known as dynamic query widgets) or by interacting with the corresponding legend. Direct manipulation interaction is disabled by default; to re-enable it, set the selection’s on property.

Legend bindings are restricted to selections that only specify a single field or encoding.

Query widget binding takes the form of Vega’s input element binding definition or can be a mapping between projected field/encodings and binding definitions.

See also: bind documentation.

valueanyOf(SelectionInit, List(SelectionInitMapping), SelectionInitIntervalMapping)

Initialize the selection with a mapping between projected channels or field names and initial values.

See also: init documentation.

__init__(name=Undefined, select=Undefined, bind=Undefined, value=Undefined, **kwds)

Methods

__init__([name, select, bind, value])
copy([deep, ignore])	Return a copy of the object
from_dict(dct[, validate, _wrapper_classes])	Construct class from a dictionary representation
from_json(json_string[, validate])	Instantiate the object from a valid JSON string
resolve_references([schema])	Resolve references in the context of this object's schema or root schema.
to_dict([validate, ignore, context])	Return a dictionary representation of the object
to_json([validate, ignore, context, indent, ...])	Emit the JSON representation for this object as a string.
validate(instance[, schema])	Validate the instance against the class schema in the context of the rootschema.
validate_property(name, value[, schema])	Validate a property against property schema in the context of the rootschema