Add layer | CARTO

Gist fc77170db4eeca1daeb7

This example demonstrates how to initialize a Leaflet map centered at coordinates [0,0] with a zoom level of 2, then add a CartoDB layer to it. The code uses the `L.Map` constructor and `cartodb.createLayer` to load a visualization from a CartoDB visualization JSON URL. Once the layer finishes loading, a callback function is available for further interaction, while an error handler displays an alert if the layer fails to load. The map serves as the base canvas for displaying the CartoDB-provided geographic data.

Aandrewxhill

74% match

Layer selector example | CartoDB.js

An interactive map demonstrates layer selection through a custom side panel. Using CartoDB.js and Leaflet, the example loads a multi-layer visualization from a CartoDB viz.json URL, displaying countries, cables, and populated places as separate sublayers. A styled HTML list acts as the layer selector, where clicking different options triggers the `show()` and `hide()` methods on specific sublayer indices to toggle their visibility. The map initializes on a dark background with zoom controls, and a SQL query object from `cartodb.SQL` is created for potential data interactions.

Aandrewxhill

73% match

Lesson 2 | CARTO.js | CartoDB

This example demonstrates interactive layer controls for a map built with CARTO.js. It displays two CartoDB sublayers—African countries and global lakes—over an OpenStreetMap basemap using the Leaflet map object. Two dashboard buttons toggle the visibility of each sublayer by calling the `hide()` and `show()` methods on the corresponding sublayer. The map is centered on southern France at zoom level 3, and the sublayers are defined with custom SQL queries and CartoCSS styling.

73% match

Layer selector example | CartoDB.js

This example shows an interactive map of urban areas with a click-to-zoom-and-download feature. It displays polygon features from the Natural Earth dataset, and clicking a polygon either zooms to its centroid if the map is zoomed out, or triggers a download of shapefile data from an OpenStreetMap database query. The visualization uses CartoDB.js to create the map and manage layers, with a custom SQL query selecting geometry, area, and centroid coordinates. The code also enables feature interactivity and handles click events to update the map view or initiate a file download.

Aandrewxhill

73% match

Gist 2869abf438288423d49f56f8047b3ca9

This example builds a custom interactive map by layering a scanned historical campus map from MapWarper between two CARTO Voyager basemap tilesets: one without labels and one with labels only. The code constructs a JSON mapconfig specifying three HTTP tile layers and uses the requests library to post it to Carto’s map API. The result visually sandwiches the old map beneath modern road and label layers, preserving geographic context while overlaying contemporary annotations.

Load a public CARTO Builder URL dynamically

This example loads a public CARTO Builder URL into a Mapbox GL map as a raster tile layer. It shows how a user can paste a CARTO embed URL, select specific layers from a dropdown, and dynamically add the corresponding map tiles to the Mapbox GL view. The code parses the URL to extract the username and named map template, constructs an XYZ tile request, and uses `map.addLayer` with a raster source to display the data. The interface includes an input field, layer selector, and a button to trigger the tile loading.

Easy example | CartoDB.js

This example loads a CartoDB-hosted map visualization into a full-screen `<div id="map">` using the CartoDB.js library. It calls `cartodb.createVis` with a specific `viz.json` URL, setting initial center coordinates at latitude 0, longitude 0, zoom level 2, and disabling the time slider. The map renders the visualization’s default layers and styling from the referenced CartoDB account. The page includes the CartoDB CSS and JavaScript files from `libs.cartocdn.com`, and any loading errors are logged to the console.

Easy example | CartoDB.js

This example uses CartoDB.js to create an interactive map visualization. The map loads a public CartoDB visualization from a hosted viz.json URL and displays it with a base layer and a CartoDB data layer. The code enables layer interaction, allowing feature hover events to log data through `cartodb.log.log`, and then retrieves the native Leaflet map object to set zoom and pan to Buenos Aires. The visualization uses the CartoDB CSS and JavaScript libraries, with a simple full-screen map container.

Aaaizemberg