modus/shp-to-geojson.html at main · oats-center/modus · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Shapefile to GeoJSON Converter</title>
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        #dropzone {
            width: 90%;
            height: 200px;
            border: 2px dashed #ccc;
            border-radius: 10px;
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 20px;
            text-align: center;
            cursor: pointer;
        }
        #dropzone:hover {
            border-color: #aaa;
        }
        #content {
            width: 90%;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        #map {
            width: 100%;
            height: 500px;
        }
        #geojson-container {
            display: flex;
            flex-direction: column;
        }
        #geojson-output {
            background-color: #f8f8f8;
            border: 1px solid #ddd;
            padding: 10px;
            max-height: 500px;
            overflow-y: auto;
            white-space: pre-wrap;
            word-wrap: break-word;
        }
        #buttons {
            margin-top: 10px;
            display: flex;
            gap: 10px;
        }
    </style>
</head>
<body>
    <div id="dropzone">Drop your shapefile ZIP here</div>
    <div id="content">
        <div id="map"></div>
        <div id="geojson-container">
            <pre id="geojson-output"></pre>
            <div id="buttons">
                <button id="copy-btn" disabled>Copy GeoJSON</button>
                <button id="download-btn" disabled>Download GeoJSON</button>
            </div>
        </div>
    </div>

    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
    <script type="module">
        import shp from 'https://unpkg.com/shpjs@latest/dist/shp.esm.js';

        const dropzone = document.getElementById('dropzone');
        const output = document.getElementById('geojson-output');
        const copyBtn = document.getElementById('copy-btn');
        const downloadBtn = document.getElementById('download-btn');
        let geojsonData = null;
        let filePrefix = '';

        // Initialize map
        const map = L.map('map').setView([0, 0], 2);
        L.tileLayer('https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}', {
            attribution: 'Tiles &copy; Esri &mdash; Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community'
        }).addTo(map);

        // Drag and drop handling
        dropzone.addEventListener('dragover', (e) => {
            e.preventDefault();
            dropzone.style.borderColor = '#000';
        });

        dropzone.addEventListener('dragleave', () => {
            dropzone.style.borderColor = '#ccc';
        });

        dropzone.addEventListener('drop', async (e) => {
            e.preventDefault();
            dropzone.style.borderColor = '#ccc';
            const file = e.dataTransfer.files[0];
            if (!file || !file.name.endsWith('.zip')) {
                alert('Please drop a ZIP file.');
                return;
            }
            filePrefix = file.name.replace('.zip', '');
            const buffer = await file.arrayBuffer();
            try {
                let geojson = await shp(buffer);
                // If multiple shapefiles, merge into single FeatureCollection
                if (Array.isArray(geojson)) {
                    const allFeatures = geojson.flatMap(g => {
                        if (g && g.features) {
                            return g.features.map(f => {
                                if (g.fileName) {
                                    f.properties = { ...f.properties, sourceFile: g.fileName };
                                }
                                return f;
                            });
                        }
                        return [];
                    });
                    geojson = {
                        type: 'FeatureCollection',
                        features: allFeatures
                    };
                }
                // Display GeoJSON
                output.textContent = JSON.stringify(geojson, null, 2);
                geojsonData = geojson;
                copyBtn.disabled = false;
                downloadBtn.disabled = false;

                // Add to map
                map.eachLayer(layer => {
                    if (layer !== map._layers[Object.keys(map._layers)[0]]) { // Remove previous layers except base
                        map.removeLayer(layer);
                    }
                });
                const geoJsonLayer = L.geoJSON(geojson, {
                    onEachFeature: (feature, layer) => {
                        layer.on('mouseover', (e) => {
                            const props = feature.properties || {};
                            const popupContent = Object.entries(props)
                                .map(([key, value]) => `<b>${key}:</b> ${value}`)
                                .join('<br>');
                            layer.bindPopup(popupContent, { autoPan: false }).openPopup();
                        });
                        layer.on('mouseout', () => {
                            layer.closePopup();
                        });
                    }
                }).addTo(map);
                map.fitBounds(geoJsonLayer.getBounds());
            } catch (error) {
                alert('Error processing shapefile: ' + error.message);
            }
        });

        // Copy button
        copyBtn.addEventListener('click', () => {
            navigator.clipboard.writeText(JSON.stringify(geojsonData, null, 2))
                .then(() => alert('GeoJSON copied to clipboard!'))
                .catch(err => alert('Error copying: ' + err));
        });

        // Download button
        downloadBtn.addEventListener('click', () => {
            const blob = new Blob([JSON.stringify(geojsonData, null, 2)], { type: 'application/json' });
            const url = URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = url;
            a.download = `${filePrefix}.geojson`;
            a.click();
            URL.revokeObjectURL(url);
        });
    </script>
</body>
</html>