Data-driven styling

FeatureLayer interface

google.maps.FeatureLayer interface

An interface representing a map layer containing features of a specific FeatureType whose style can be overridden client-side, or have events attached.

Properties
`featureType`	Type: `FeatureType` The `FeatureType` associated with this `FeatureLayer`.
`isAvailable`	Type: `boolean` Whether this `FeatureLayer` is available, meaning whether Data-driven styling is available for this map (there is a map ID using vector tiles with this `FeatureLayer` enabled in the Google Cloud Console map style.) If this is false (or becomes false), styling on this `FeatureLayer` returns to default and events are not triggered.
`datasetId optional`	Type: `string optional` The Dataset ID for this `FeatureLayer`. Only present if the `featureType` is `FeatureType.DATASET`.
`style optional`	Type: `FeatureStyleOptions\|FeatureStyleFunction optional` The style of `Feature`s in the `FeatureLayer`. The style is applied when style is set. If your style function updates, you must set the style property again. A `FeatureStyleFunction` must return consistent results when it is applied over the map tiles, and should be optimized for performance. Asynchronous functions are not supported. If you use a `FeatureStyleOptions`, all features of that layer will be styled with the same `FeatureStyleOptions`. Set the style to `null` to remove the previously set style. If this `FeatureLayer` is not available, setting style does nothing and logs an error.

Methods
`addListener`	`addListener(eventName, handler)` Parameters: `eventName`: `string` Observed event. `handler`: `Function` Function to handle events. Return Value: `MapsEventListener` Resulting event listener. Adds the given listener function to the given event name. Returns an identifier for this listener that can be used with `event.removeListener`.

Methods

addListener

addListener(eventName, handler)

Parameters:

eventName: string Observed event.
handler: Function Function to handle events.

Return Value: MapsEventListener Resulting event listener.

Adds the given listener function to the given event name. Returns an identifier for this listener that can be used with event.removeListener.

Events
`click`	`function(event)` Arguments: `event`: `FeatureMouseEvent` This event is fired when the `FeatureLayer` is clicked.
`mousemove`	`function(event)` Arguments: `event`: `FeatureMouseEvent` This event is fired when the user's mouse moves over the `FeatureLayer`.

Events

click

function(event)

Arguments:

event: FeatureMouseEvent

This event is fired when the FeatureLayer is clicked.

mousemove

function(event)

Arguments:

event: FeatureMouseEvent

This event is fired when the user's mouse moves over the FeatureLayer.

FeatureType constants

google.maps.FeatureType constants

Identifiers for feature types.

Access by calling const {FeatureType} = await google.maps.importLibrary("maps").
See Libraries in the Maps JavaScript API.

Constants
`ADMINISTRATIVE_AREA_LEVEL_1`	Indicates a first-order civil entity below the country level.
`ADMINISTRATIVE_AREA_LEVEL_2`	Indicates a second-order civil entity below the country level.
`COUNTRY`	Indicates the national political entity.
`DATASET`	Indicates a third-party dataset.
`LOCALITY`	Indicates an incorporated city or town political entity.
`POSTAL_CODE`	Indicates a postal code as used to address postal mail within the country. Includes zip codes.
`SCHOOL_DISTRICT`	Indicates a school district.

FeatureStyleFunctionOptions interface

google.maps.FeatureStyleFunctionOptions interface

Options passed to a FeatureStyleFunction.

Properties
`feature`	Type: `Feature` `Feature` passed into the `FeatureStyleFunction` for styling.

FeatureStyleOptions interface

google.maps.FeatureStyleOptions interface

These options specify the way the style of a Feature should be modified on a map.

Properties
`fillColor optional`	Type: `string optional` Hex RGB string (like "#00FF00" for green). Only applies to polygon geometries.
`fillOpacity optional`	Type: `number optional` The fill opacity between 0.0 and 1.0. Only applies to polygon geometries.
`strokeColor optional`	Type: `string optional` Hex RGB string (like "#00FF00" for green).
`strokeOpacity optional`	Type: `number optional` The stroke opacity between 0.0 and 1.0. Only applies to line and polygon geometries.
`strokeWeight optional`	Type: `number optional` The stroke width in pixels. Only applies to line and polygon geometries.

Feature interface

google.maps.Feature interface

An interface representing a vector map tile feature. These are inputs to the FeatureStyleFunction. Do not save a reference to a particular Feature object because the reference will not be stable.

Properties
`featureType`	Type: `FeatureType` `FeatureType` of this `Feature`.

DatasetFeature interface

google.maps.DatasetFeature interface

An interface representing a feature from a Dataset. The featureType of a DatasetFeature will always be FeatureType.DATASET.

This interface extends Feature.

Properties
`datasetAttributes`	Type: `Object<string, string>` Key-value mapping of the feature's attributes.
`datasetId`	Type: `string` Dataset id of the dataset that this feature belongs to.
Inherited: `featureType`

Properties

datasetAttributes

Type: Object<string, string>

Key-value mapping of the feature's attributes.

datasetId

Type: string

Dataset id of the dataset that this feature belongs to.

Inherited: featureType

FeatureMouseEvent interface

google.maps.FeatureMouseEvent interface

This object is returned from a mouse event on a FeatureLayer.

This interface extends MapMouseEvent.

Properties
`features`	Type: `Array<Feature>` The `Feature`s at this mouse event.
Inherited: `domEvent`, `latLng`

Methods
Inherited: `stop`