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Last active August 25, 2022 17:49
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Use feature state to change features to same color on hover
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>Create a hover effect</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.47.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.47.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoibWFsLXdvb2QiLCJhIjoiY2oyZ2t2em50MDAyMzJ3cnltMDFhb2NzdiJ9.X-D4Wvo5E5QxeP7K_I3O8w';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v9',
center: [-100.486052, 37.830348],
zoom: 2
});
var hoveredStateId = null;
map.on('load', function () {
map.addSource("shapes", {
"type": "geojson",
"data": "./shape-data.geojson"
});
// The feature-state dependent fill-opacity expression will render the hover effect
// when a feature's hover state is set to true.
map.addLayer({
"id": "shape-fills",
"type": "fill",
"source": "shapes",
"layout": {},
"paint": {
"fill-color": ['case',
["boolean", ["feature-state", "hover"], false],
"#fff",
['match',['get', 'test'],
'foo', '#90e2bc',
'bar', '#faff67',
'baz', '#a0aabf',
'#a0aabf']],
"fill-opacity": 1,
}
});
map.on("mousemove", "shape-fills", function(e) {
if (e.features.length > 0) {
if (hoveredStateId) {
map.setFeatureState({source: 'shapes', id: hoveredStateId}, { hover: false});
}
console.log(e.features[0].id)
hoveredStateId = e.features[0].id;
map.setFeatureState({source: 'shapes', id: hoveredStateId}, { hover: true});
}
});
map.on("mouseleave", "shape-fills", function() {
if (hoveredStateId) {
map.setFeatureState({source: 'shapes', id: hoveredStateId}, { hover: false});
}
hoveredStateId = null;
});
});
</script>
</body>
</html>
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shape-data.geojson
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