Get features under the mouse pointer | UNL Map JS Docs

Use queryRenderedFeatures to show properties of hovered-over map elements.

Note

If you want to test this example, edit it in JSFiddle or CodePen and replace the "YOUR-OWN-API-KEY" and "YOUR-OWN-VPM-ID" placeholders with your actual api key and vpm id.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Get features under the mouse pointer</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/unl-map-js@0.1.5/lib/unl-map-js.js"></script>
<link href="https://unpkg.com/unl-map-js@0.1.5/lib/unl-map-js.css" rel="stylesheet" />
<link
href="https://unpkg.com/maplibre-gl@2.1.9/dist/maplibre-gl.css"
rel="stylesheet"
/>
<style>
	body { margin: 0; padding: 0; }
	#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
#features {
position: absolute;
top: 0;
right: 0;
bottom: 0;
width: 50%;
overflow: auto;
background: rgba(255, 255, 255, 0.8);
}
#map canvas {
cursor: crosshair;
}
</style>
<div id="map"></div>
<pre id="features"></pre>
<script>
var map = new UnlSdk.Map({
container: "map",
apiKey: "YOUR-OWN-API-KEY",
vpmId: "YOUR-OWN-VPM-ID",
center: [-96, 37.8],
zoom: 3,
});
 
map.on("mousemove", function (e) {
var features = map.queryRenderedFeatures(e.point);
 
// Limit the number of properties we're displaying for
// legibility and performance
var displayProperties = [
"type",
"properties",
"id",
"layer",
"source",
"sourceLayer",
"state",
];
 
var displayFeatures = features.map(function (feat) {
var displayFeat = {};
displayProperties.forEach(function (prop) {
displayFeat[prop] = feat[prop];
});
return displayFeat;
});
 
document.getElementById("features").innerHTML = JSON.stringify(
displayFeatures,
null,
2
);
});
</script>
 
</body>
</html>