Change a Layer's Color with Buttons

Changing a layer’s color at runtime in Maptoolkit Maps JS is done with map.setPaintProperty, which updates any paint property on an existing layer without reloading the style. This example connects a set of buttons to different color values and applies them to a fill layer when clicked. Use this pattern to build theme switchers, highlight modes, or any UI that lets users adjust how data is visualized on the map.

const API_KEY = 'YOUR_API_KEY';

    const map = new maptoolkit.Map({
        container: 'map',
        apiKey: API_KEY,
        style: `https://styles.maptoolkit.net/maptoolkit/maptoolkit.summer.json?api_key=${API_KEY}`,
        center: [13.405, 52.52],
        zoom: 14,
        attributionControl: { compact: false }
    });

    const swatches = document.getElementById('swatches');
    const layer = document.getElementById('layer');
    const colors = [
        '#ffffcc', '#a1dab4', '#41b6c4', '#2c7fb8', '#253494',
        '#fed976', '#feb24c', '#fd8d3c', '#f03b20', '#bd0026'
    ];

    colors.forEach((color) => {
        const swatch = document.createElement('button');
        swatch.style.backgroundColor = color;
        swatch.addEventListener('click', () => {
            map.setPaintProperty(layer.value, 'fill-color', color);
        });
        swatches.appendChild(swatch);
    });

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Change a Layer's Color with Buttons - Maptoolkit Maps JS</title>
    <meta property="og:description" content="Change the color of a map layer dynamically using buttons." />
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://unpkg.com/@maptoolkit/[email protected]/dist/maptoolkit.js"></script>
    <link rel="stylesheet" href="https://unpkg.com/@maptoolkit/[email protected]/dist/maptoolkit.css" />
    <style>
        html, body { width: 100%; height: 100%; margin: 0; padding: 0; }
        #map { width: 100%; height: 100%; }
        .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>
</head>
<body>
<div id="map"></div>
<div class="map-overlay top">
    <div class="map-overlay-inner">
        <fieldset>
            <label for="layer">Select layer</label>
            <select id="layer" name="layer">
                <option value="water">Water</option>
                <option value="building_multicolored">Buildings</option>
            </select>
        </fieldset>
        <fieldset>
            <label>Choose a color</label>
            <div id="swatches"></div>
        </fieldset>
    </div>
</div>
<script>
    const API_KEY = 'YOUR_API_KEY';

    const map = new maptoolkit.Map({
        container: 'map',
        apiKey: API_KEY,
        style: `https://styles.maptoolkit.net/maptoolkit/maptoolkit.summer.json?api_key=${API_KEY}`,
        center: [13.405, 52.52],
        zoom: 14,
        attributionControl: { compact: false }
    });

    const swatches = document.getElementById('swatches');
    const layer = document.getElementById('layer');
    const colors = [
        '#ffffcc', '#a1dab4', '#41b6c4', '#2c7fb8', '#253494',
        '#fed976', '#feb24c', '#fd8d3c', '#f03b20', '#bd0026'
    ];

    colors.forEach((color) => {
        const swatch = document.createElement('button');
        swatch.style.backgroundColor = color;
        swatch.addEventListener('click', () => {
            map.setPaintProperty(layer.value, 'fill-color', color);
        });
        swatches.appendChild(swatch);
    });
</script>
</body>
</html>

Use the prompt below with any LLM to get the same result. Make sure the Maptoolkit MCP server is connected first — check out AI Integration & MCP to get started.

Use the Maptoolkit Connector. Create an interactive map with zoom level 14, centered around [13.405, 52.52]. Add a UI overlay with a layer selector (water/buildings) and color swatches that change the selected layer’s fill color on click.

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