Create a hover effect
Use events and feature states to create a per feature hover effect.
<!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://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-gl.js"></script><link href="https://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-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>
var map = new trackasiagl.Map({
container: 'map',
style: 'https://maps.track-asia.com/styles/v1/streets.json?key=public_key',
center: [-100.486052, 37.830348],
zoom: 2
});
var hoveredStateId = null;
map.on('load', function () {
map.addSource('states', {
'type': 'geojson',
'data': 'https://docs.track-asia.com/assets/us_states.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': 'state-fills',
'type': 'fill',
'source': 'states',
'layout': {},
'paint': {
'fill-color': '#627BC1',
'fill-opacity': [
'case',
['boolean', ['feature-state', 'hover'], false],
1,
0.5
]
}
});
map.addLayer({
'id': 'state-borders',
'type': 'line',
'source': 'states',
'layout': {},
'paint': {
'line-color': '#627BC1',
'line-width': 2
}
});
// When the user moves their mouse over the state-fill layer, we'll update the
// feature state for the feature under the mouse.
map.on('mousemove', 'state-fills', function (e) {
if (e.features.length > 0) {
if (hoveredStateId) {
map.setFeatureState(
{ source: 'states', id: hoveredStateId },
{ hover: false }
);
}
hoveredStateId = e.features[0].id;
map.setFeatureState(
{ source: 'states', id: hoveredStateId },
{ hover: true }
);
}
});
// When the mouse leaves the state-fill layer, update the feature state of the
// previously hovered feature.
map.on('mouseleave', 'state-fills', function () {
if (hoveredStateId) {
map.setFeatureState(
{ source: 'states', id: hoveredStateId },
{ hover: false }
);
}
hoveredStateId = null;
});
});
</script>
</body></html>