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CARTOVL: Hide/show layer depending on zoom level
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Add multiple layers | CARTO</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta charset="UTF-8"> | |
| <script src="https://libs.cartocdn.com/carto-vl/v1.1.1/carto-vl.min.js"></script> | |
| <script src="https://api.tiles.mapbox.com/mapbox-gl-js/v0.52.0/mapbox-gl.js"></script> | |
| <link href="https://api.tiles.mapbox.com/mapbox-gl-js/v0.52.0/mapbox-gl.css" rel="stylesheet" /> | |
| <link href="https://carto.com/developers/carto-vl/v1.1.1/examples/maps/style.css" rel="stylesheet"> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <aside class="toolbox"> | |
| <div class="box"> | |
| <header> | |
| <h1>Multiple layers</h1> | |
| </header> | |
| <section> | |
| <p class="description open-sans">Add multiple layers to your map</p> | |
| </section> | |
| <footer class="js-footer"></footer> | |
| </div> | |
| </aside> | |
| <div id="loader"> | |
| <div class="CDB-LoaderIcon CDB-LoaderIcon--big"> | |
| <svg class="CDB-LoaderIcon-spinner" viewBox="0 0 50 50"> | |
| <circle class="CDB-LoaderIcon-path" cx="25" cy="25" r="20" fill="none"></circle> | |
| </svg> | |
| </div> | |
| </div> | |
| <script> | |
| const map = new mapboxgl.Map({ | |
| container: 'map', | |
| style: carto.basemaps.voyager, | |
| center: [0, 43], | |
| zoom: 4, | |
| scrollZoom: true | |
| }); | |
| const zoomLimit = 10; | |
| const zoomOverlap = 1; | |
| const nav = new mapboxgl.NavigationControl({ | |
| showCompass: false | |
| }); | |
| map.addControl(nav, 'top-left'); | |
| // Define user | |
| carto.setDefaultAuth({ | |
| username: 'cartovl', | |
| apiKey: 'default_public' | |
| }); | |
| // Define layers | |
| const citiesSource = new carto.source.SQL(` | |
| SELECT * | |
| FROM populated_places | |
| WHERE adm0name IN ('Spain','France','Italy','Switzerland','Portugal') | |
| `); | |
| const citiesViz = new carto.Viz(` | |
| width: 200 | |
| `); | |
| const citiesLayer = new carto.Layer('citiesLayer', citiesSource, citiesViz); | |
| const countriesSource = new carto.source.SQL(` | |
| SELECT * | |
| FROM ne_adm0_europe | |
| WHERE admin IN ('Spain','France','Italy','Switzerland','Portugal') | |
| `); | |
| const countriesViz = new carto.Viz(); | |
| const countriesLayer = new carto.Layer('countriesLayer', countriesSource, countriesViz); | |
| citiesLayer.addTo(map, 'watername_ocean'); | |
| countriesLayer.addTo(map, 'citiesLayer'); | |
| countriesLayer.on('loaded', hideLoader); | |
| function hideLoader() { | |
| document.getElementById('loader').style.opacity = '0'; | |
| } | |
| ///// Set map events //////// | |
| map.on('load', () => { | |
| showHideLayers() | |
| }); | |
| map.on('moveend', () => { | |
| showHideLayers() | |
| if (citiesLayer.visible === true){ | |
| console.log('Do somthing') | |
| } | |
| }); | |
| function showHideLayers(){ | |
| /** | |
| * Hide or show a CARTO layer depending on the zoom level | |
| */ | |
| const zoom = map.getZoom(); | |
| if (zoom >= zoomLimit) { | |
| citiesLayer.show(); | |
| if (zoom > zoomLimit + zoomOverlap) { | |
| countriesLayer.hide(); | |
| } | |
| } else { | |
| countriesLayer.show(); | |
| if (zoom < zoomLimit - zoomOverlap) { | |
| citiesLayer.hide(); | |
| } | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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