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Highlight features containing similar data

Hover over counties to highlight counties that share the same name.

<!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.mapbox.com/mapbox-gl-js/v1.6.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v1.6.1/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, 0.1);
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 = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [-98, 38.88],
minZoom: 2,
zoom: 3
});
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
// county polygons uploaded as vector tiles
map.addSource('counties', {
'type': 'vector',
'url': 'mapbox://mapbox.82pkq93d'
});
map.addLayer(
{
'id': 'counties',
'type': 'fill',
'source': 'counties',
'source-layer': 'original',
'paint': {
'fill-outline-color': 'rgba(0,0,0,0.1)',
'fill-color': 'rgba(0,0,0,0.1)'
}
},
'settlement-label'
); // Place polygon under these labels.
map.addLayer(
{
'id': 'counties-highlighted',
'type': 'fill',
'source': 'counties',
'source-layer': 'original',
'paint': {
'fill-outline-color': '#484896',
'fill-color': '#6e599f',
'fill-opacity': 0.75
},
'filter': ['in', 'COUNTY', '']
},
'settlement-label'
); // Place polygon under these labels.
map.on('mousemove', 'counties', 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 counties layer visible in the map. Use the filter
// param to only collect results that share the same county name.
var relatedFeatures = map.querySourceFeatures('counties', {
sourceLayer: 'original',
filter: ['in', 'COUNTY', feature.properties.COUNTY]
});
// Render found features in an overlay.
overlay.innerHTML = '';
// Total the population of all features
var populationSum = relatedFeatures.reduce(function(memo, feature) {
return memo + feature.properties.population;
}, 0);
var title = document.createElement('strong');
title.textContent =
feature.properties.COUNTY +
' (' +
relatedFeatures.length +
' found)';
var population = document.createElement('div');
population.textContent =
'Total population: ' + populationSum.toLocaleString();
overlay.appendChild(title);
overlay.appendChild(population);
overlay.style.display = 'block';
// Add features that share the same county name to the highlighted layer.
map.setFilter('counties-highlighted', [
'in',
'COUNTY',
feature.properties.COUNTY
]);
// Display a popup with the name of the county
popup
.setLngLat(e.lngLat)
.setText(feature.properties.COUNTY)
.addTo(map);
});
map.on('mouseleave', 'counties', function() {
map.getCanvas().style.cursor = '';
popup.remove();
map.setFilter('counties-highlighted', ['in', 'COUNTY', '']);
overlay.style.display = 'none';
});
});
</script>
</body>
</html>
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