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open-GeoJSON.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>GeoJSON Upload and Render with FlyTo Bounds</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<!-- Include MapLibre GL JS and MapLibre GL CSS from a CDN -->
<script src=https://unpkg.com/maplibre-gl/dist/maplibre-gl.js></script>
<link href=https://unpkg.com/maplibre-gl/dist/maplibre-gl.css rel="stylesheet" />
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 75%; }
#file-input { position: absolute; top: 10px; left: 10px; z-index: 100; }
#side-panel {
position: absolute;
top: 0;
right: 0;
width: 25%;
bottom: 0;
overflow-y: auto;
background-color: #fff;
border-left: 1px solid #ccc;
padding: 10px;
box-sizing: border-box;
}
pre {
white-space: pre-wrap;
word-wrap: break-word;
}
</style>
</head>
<body>
<div id='map'></div>
<input id="file-input" type="file" accept=".geojson" />
<div id="side-panel"><pre id="geojson-display"></pre></div>
<script>
const map = new maplibregl.Map({
container: 'map',
style: 'https://demotiles.maplibre.org/style.json', // Replace with your style URL
center: [0, 0],
zoom: 0
});
const handleFileUpload = (event) => {
const file = event.target.files[0];
if (file) {
const reader = new FileReader();
reader.onload = (e) => {
const data = JSON.parse(e.target.result);
if (data.type === 'FeatureCollection') {
displayGeoJSONText(data);
renderGeoJSON(data);
flyToGeoJSONBounds(data);
} else {
alert('The file is not a valid GeoJSON FeatureCollection.');
}
};
reader.readAsText(file);
}
};
const displayGeoJSONText = (geojsonData) => {
const formattedText = JSON.stringify(geojsonData, null, 2);
document.getElementById('geojson-display').textContent = formattedText;
};
const renderGeoJSON = (geojsonData) => {
if (map.getSource('geojson-source')) {
map.getSource('geojson-source').setData(geojsonData);
} else {
map.addSource('geojson-source', {
type: 'geojson',
data: geojsonData
});
map.addLayer({
id: 'geojson-layer',
type: 'fill',
source: 'geojson-source',
layout: {},
paint: {
'fill-color': '#888',
'fill-opacity': 0.4
}
});
}
};
const flyToGeoJSONBounds = (geojsonData) => {
const bounds = geojsonData.features.reduce((bounds, feature) => {
return bounds.extend(getFeatureBounds(feature));
}, new maplibregl.LngLatBounds());
map.fitBounds(bounds, {
padding: 20,
duration: 2000
});
};
// Function to get bounds from a feature
const getFeatureBounds = (feature) => {
const bounds = new maplibregl.LngLatBounds();
const geometry = feature.geometry;
if (geometry.type === 'Point') {
bounds.extend(geometry.coordinates);
} else if (geometry.type === 'LineString' || geometry.type === 'MultiPoint') {
geometry.coordinates.forEach(coord => bounds.extend(coord));
} else if (geometry.type === 'Polygon' || geometry.type === 'MultiLineString') {
geometry.coordinates.flat().forEach(coord => bounds.extend(coord));
} else if (geometry.type === 'MultiPolygon') {
geometry.coordinates.flat(2).forEach(coord => bounds.extend(coord));
}
return bounds;
};
// Add event listener to file input
document.getElementById('file-input').addEventListener('change', handleFileUpload);
</script>
</body>
</html>