`<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>Highlight features containing similar data</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.44.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.44.1/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<style>
.map-overlay {
font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
background-color: #fff;
box-shadow: 0 1px 2px rgba(0,0,0,0.10);
border-radius: 3px;
position: absolute;
width: 25%;
top: 10px;
left: 10px;
padding: 10px;
display: none;
}
</style>
<div id='map'></div>
<div id='map-overlay' class='map-overlay'></div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoidGhlbWF0aXgiLCJhIjoiY2pnZG9iY2U3MzJxYjMybGhmMDUxZ3Z1NCJ9.WLqfBodKltXx-wx6_3Tw4w';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v9',
center: [-70, 53],
minZoom: 2,
zoom: 4
});
var overlay = document.getElementById('map-overlay');
// Create a popup, but don't add it to the map yet.
var popup = new mapboxgl.Popup({
closeButton: false
});
map.on('load', function() {
// Add the source to query. In this example we're using
// ecoregion polygons uploaded as vector tiles
map.addSource('reg_eco', {
"type": "vector",
"url": "mapbox://thematix.6pzptrfa"
});
map.addLayer({
"id": "regeco",
"type": "fill",
"source": "reg_eco",
"source-layer": "reg_eco-5jav3d",
"paint": {
"fill-outline-color": "rgba(0,0,0,0.1)",
"fill-color": "rgba(0,0,0,0.1)"
}
}, 'place-city-sm'); // Place polygon under these labels.
map.addLayer({
"id": "regecoh",
"type": "fill",
"source": "reg_eco",
"source-layer": "reg_eco-5jav3d",
"paint": {
"fill-outline-color": "#484896",
"fill-color": "#6e599f",
"fill-opacity": 0.75
},
"filter": ["in", "REG_ECO", ""]
}, 'place-city-sm'); // Place polygon under these labels.
map.on('mousemove', 'reg_eco', function(e) {
// Change the cursor style as a UI indicator.
map.getCanvas().style.cursor = 'pointer';
// Single out the first found feature.
var feature = e.features[0];
// Query the ecoregion layer visible in the map. Use the filter
// param to only collect results that share the same ecoregion name.
var relatedFeatures = map.querySourceFeatures('reg_eco', {
sourceLayer: 'reg_eco-5jav3d',
filter: ['in', 'REG_ECO', feature.properties.REG_ECO]
});
// Render found features in an overlay.
overlay.innerHTML = '';
// Add features that share the same ecoregion name to the highlighted layer.
map.setFilter('regecoh', ['in', 'REG_ECO', feature.properties.REG_ECO]);
// Display a popup with the name of the ecoregion
popup.setLngLat(e.lngLat)
.setText(feature.properties.REG_ECO)
.addTo(map);
});
map.on('mouseleave', 'reg_eco', function() {
map.getCanvas().style.cursor = '';
popup.remove();
map.setFilter('regecoh', ['in', 'REG_ECO', '']);
overlay.style.display = 'none';
});
});
</script>
</body>
</html>`