CARTO for React

Widgets

You can use widgets in your application to provide advanced functionality for exploring and filtering the information. CARTO for React comes with several widgets out-of-the-box that you can add really easily to your spatial apps:

• Category
• Formula
• Histogram
• Legend
• Pie
• ScatterPlot
• TimeSeries

The widgets are implemented combining the functionality of three different library packages:

• @carto/react-ui. This package provides the user interface functionality for widgets. This means you can reuse the UI with your own business logic if you need to provide custom functionality.

• @carto/react-widgets. This package takes advantage of the UI components from the @carto/react-ui package and provides the business logic for the filters, including the integration with other components through the Redux store.

• @carto/react-workers. This package implements the calculations needed by the widgets. Everything is implemented using web workers to improve the performance and the user experience.

Data sources

The widgets (except the Legend widget) work with vector tiles or GeoJSON features provided by the Maps API. The workers retrieve the information from the tiles / GeoJSON features and execute the different calculations needed by each widget. Every time we change the viewport, the widgets are updated.

Common properties

There are some properties that are used by all the widgets, except the Legend widget. You can check the full API reference for each widget here:

Property	Description
id	ID for the widget instance
title	Title to show in the widget header
dataSource	ID of the data source to get the data from
animation	Indicates whether the widget update is animated or jumps directly to the new state
wrapperProps	Props to pass to the WrapperWidgetUI
noDataAlertProps	Message (title and body) to show when there is no data available for the widget
onError	Event emitted when an error is thrown while the widget is doing calculations

Category widget

Groups features into categories (column) and executes an operation on another column (operationColumn) for each group. Displays 5 categories at the same time.

Requires/accepts the following additional properties:

Property	Description
column	Name of the data source’s column to get the data from
operation	Aggregation operation to apply on the operationColumn values
operationColumn	Column to use in the aggregation operation
formatter	Formatter for the aggregated value
labels	Labels to show for each category

Formula widget

Calculates a value executing an aggregation operation on a data source column.

Requires/accepts the following additional properties:

Property	Description
column	Name of the data source’s column to get the data from
operation	Aggregation operation to apply on the column values
formatter	Formatter for the aggregated value

Histogram widget

Groups features into buckets after executing an aggregation operation on a column.

Requires/accepts the following additional properties:

Property	Description
column	Name of the data source’s column to get the data from
operation	Aggregation operation to apply on the column values
formatter	Formatter for the aggregated value
ticks	Breaks to define the buckets
xAxisFormatter	Formatter for X axis values

Legend widget

Creates a widget for switching layers on/off and showing legends. The legend representation depends on the legend type. The widget access the layer information from the store and add the legend for those layers where it has been specified.

Accepts the following optional property:

Property	Description
className	Material-UI withStyle class for styling

Pie widget

Groups features into categories (column) and executes an operation on another column (operationColumn) for each group.

Requires/accepts the following additional properties:

Property	Description
column	Name of the data source’s column to get the data from
operation	Aggregation operation to apply on the operationColumn values
operationColumn	Column to use in the aggregation operation
formatter	Formatter for the aggregated value
height	Chart height (CSS)
tooltipFormatter	Formatter for the tooltip
colors	Array of colors to show for each category.
labels	Labels to show for each category

ScatterPlot widget

Represents two properties/columns in a cartesian chart from a data source to help understand if there is correlation between them.

Requires/accepts the following additional properties:

Property	Description
xAxisColumn	Name of the data source’s column to get the data for the X axis from.
yAxisColumn	Name of the data source’s column to get the data for the Y axis from.
xAxisFormatter	Function to format X axis values.
yAxisFormatter	Function to format X axis values.
tooltipFormatter	Function to format the tooltip values.

TimeSeries widget

Groups features into time intervals and allows to play an animation that filters the features displayed based on the current interval.

Requires/accepts the following additional properties:

Property	Description
column	Column containing the timestamp/date values
operation	Aggregation operation to apply on the operationColumn values. Default: COUNT
operationColumn	Column to use in the aggregation operation
formatter	Formatter for the aggregated value
height	Chart height (CSS)
tooltipFormatter	Formatter for the tooltip
stepSize	Time interval size
stepSizeOptions	Available time interval sizes
chartType	Selected chart type: line chart (default) or bar chart
tooltip	Whether to show or not the tooltip
timeWindow	Interval for the currently selected time window
showControls	Whether to show or not the controls (play, pause, stop, speed selection…)
isPlaying	Whether to set the widget to play mode
isPaused	Whether to set the widget to pause mode
onPlay	Event emitted when the animation starts to play
onPause	Event emitted when the animation is paused
onStop	Event emitted when the animation is stopped
onTimelineUpdate	Event emitted when the animation moves to the next time interval
onTimeWindowUpdate	Event emitted when the time window moves to the next time interval