Change a layer's color with buttons | UNL Map JS Docs

Use setPaintProperty to change a layer's fill color.

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>Change a layer's color with buttons</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>
.map-overlay {
font: 12px/20px "Helvetica Neue", Arial, Helvetica, sans-serif;
position: absolute;
width: 200px;
top: 0;
left: 0;
padding: 10px;
}
 
.map-overlay .map-overlay-inner {
background-color: #fff;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
border-radius: 3px;
padding: 10px;
margin-bottom: 10px;
}
 
.map-overlay-inner fieldset {
border: none;
padding: 0;
margin: 0 0 10px;
}
 
.map-overlay-inner fieldset:last-child {
margin: 0;
}
 
.map-overlay-inner select {
width: 100%;
}
 
.map-overlay-inner label {
display: block;
font-weight: bold;
margin: 0 0 5px;
}
 
.map-overlay-inner button {
display: inline-block;
width: 36px;
height: 20px;
border: none;
cursor: pointer;
}
 
.map-overlay-inner button:focus {
outline: none;
}
 
.map-overlay-inner button:hover {
box-shadow: inset 0 0 0 3px rgba(0, 0, 0, 0.1);
}
</style>
 
<div id="map"></div>
<div class="map-overlay top">
<div class="map-overlay-inner">
<fieldset>
<label>Select layer</label>
<select id="layer" name="layer">
<option value="water">Water</option>
<option value="building">Buildings</option>
</select>
</fieldset>
<fieldset>
<label>Choose a color</label>
<div id="swatches"></div>
</fieldset>
</div>
</div>
 
<script>
var map = new UnlSdk.Map({
container: "map",
apiKey: "YOUR-OWN-API-KEY",
vpmId: "YOUR-OWN-VPM-ID",
center: [12.338, 45.4385],
zoom: 17.4,
});
 
var swatches = document.getElementById("swatches");
var layer = document.getElementById("layer");
var colors = [
"#ffffcc",
"#a1dab4",
"#41b6c4",
"#2c7fb8",
"#253494",
"#fed976",
"#feb24c",
"#fd8d3c",
"#f03b20",
"#bd0026",
];
 
colors.forEach(function (color) {
var swatch = document.createElement("button");
swatch.style.backgroundColor = color;
swatch.addEventListener("click", function () {
map.setPaintProperty(layer.value, "fill-color", color);
});
swatches.appendChild(swatch);
});
</script>
 
</body>
</html>