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July 11, 2018 08:54
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Add legend from metadata | CARTO.js v4
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Add legend from metadata | CARTO</title> | |
| <meta name="viewport" content="initial-scale=1.0"> | |
| <meta charset="utf-8"> | |
| <!-- Include Leaflet --> | |
| <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"></script> | |
| <link href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css" rel="stylesheet"> | |
| <!-- Include CARTO.js --> | |
| <script src="https://libs.cartocdn.com/carto.js/v4.0.16/carto.min.js"></script> | |
| <!-- Include jQuery --> | |
| <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> | |
| <link href="https://fonts.googleapis.com/css?family=Montserrat:400,600,700|Open+Sans:300,400,600" rel="stylesheet"> | |
| <link href="style.css" rel="stylesheet"> | |
| </head> | |
| <body> | |
| <div id="map"> | |
| <!-- legend --> | |
| <div id="legend"> | |
| <h1>Legend</h1> | |
| <div id="legend-content"> | |
| </div> | |
| </div> | |
| <script typ="text/javascript" src="script.js"></script> | |
| </body> | |
| </html> | |
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| // add Leaflet map to map container | |
| const map = L.map('map').setView([30, 0], 3); | |
| // add basemap | |
| L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_nolabels/{z}/{x}/{y}.png', { | |
| maxZoom: 18 | |
| }).addTo(map); | |
| // declare CARTO client | |
| const client = new carto.Client({ | |
| apiKey: 'default_public', | |
| username: 'cartojs-test' | |
| }); | |
| // configure and add layer | |
| const source = new carto.source.Dataset(` | |
| ne_10m_populated_places_simple | |
| `); | |
| const style = new carto.style.CartoCSS(` | |
| #layer { | |
| marker-width: 4; | |
| marker-fill: ramp([featurecla], cartocolor(Bold), category); | |
| marker-opacity: 0.7; | |
| marker-line-color: ramp([featurecla], cartocolor(Bold), category); | |
| marker-line-opacity: 0.9; | |
| } | |
| `); | |
| const layer = new carto.layer.Layer(source, style); | |
| client.addLayer(layer); | |
| client.getLeafletLayer().addTo(map); | |
| // configure and add category dataview | |
| const categoryDataview = new carto.dataview.Category(source, 'featurecla', { | |
| limit: 5, | |
| operation: carto.operation.COUNT | |
| }); | |
| client.addDataview(categoryDataview); | |
| // add bbox filter | |
| const bboxFilter = new carto.filter.BoundingBoxLeaflet(map); | |
| categoryDataview.addFilter(bboxFilter); | |
| // add legend elements | |
| const legend = $("#legend-content"); | |
| layer.on('metadataChanged', renderCategoryLegend); | |
| function renderCategoryLegend(metadata){ | |
| console.log(metadata); | |
| metadata.styles.forEach(function (styleMetadata) { | |
| if (styleMetadata.getProperty() == 'marker-fill') { | |
| let categories = styleMetadata.getCategories(); | |
| console.log(categories) | |
| for (category of categories){ | |
| legend.append(`<li><div class="circle" style="background:${category.value}"></div> ${category.name}</li>`) | |
| } | |
| } | |
| }); | |
| } |
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| html, | |
| body { | |
| height: 100%; | |
| padding: 0; | |
| margin: 0; | |
| position: relative; | |
| } | |
| #map { | |
| height: 100%; | |
| padding: 0; | |
| margin: 0; | |
| } | |
| #legend { | |
| position: absolute; | |
| bottom: 12px; | |
| left: 12px; | |
| height: auto; | |
| width: auto; | |
| padding: 20px 24px; | |
| background: white; | |
| box-shadow: 0 0 16px rgba(0, 0, 0, 0.12); | |
| border-radius: 4px; | |
| opacity: 0.7; | |
| z-index: 1; | |
| display: block; | |
| list-style-type: none; | |
| z-index: 999; | |
| } | |
| #legend h1 { | |
| font: 800 12px/16px 'Montserrat'; | |
| text-transform: uppercase; | |
| color: #2D3C43; | |
| margin-bottom: 12px; | |
| } | |
| #legend-content{ | |
| font: 800 12px/16px 'Open Sans'; | |
| margin-bottom: 6px; | |
| } | |
| #legend-content > li { | |
| margin-bottom: 6px; | |
| display: flex; | |
| align-items: center; | |
| text-transform: uppercase; | |
| } | |
| #legend-content > li:last-child { | |
| margin-bottom: 0; | |
| } | |
| .circle { | |
| width: 8px; | |
| height: 8px; | |
| border-radius: 50%; | |
| margin-right: 8px; | |
| } |
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