linked-distributed-data/openlayers.html at main · codeforcologne/linked-distributed-data · GitHub

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<!DOCTYPE html>
<html lang="de">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>OpenLayers Karte</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v10.5.0/ol.css">
    <style>
        #map {
            width: 100%;
            height: 100vh;
        }

        .popup {
            position: absolute;
            background-color: white;
            padding: 10px;
            border: 1px solid black;
            border-radius: 5px;
            display: none;
        }
    </style>
</head>

<body>
    <h1>OpenLayers Karte mit GeoJSON</h1>
    <div id="map"></div>
    <div id="popup" class="popup"></div>

    <script src="https://cdn.jsdelivr.net/npm/ol@v10.5.0/dist/ol.js"></script>
    <script>
        // Karte initialisieren
        const map = new ol.Map({
            target: 'map',
            layers: [
                new ol.layer.Tile({
                    source: new ol.source.OSM() // OpenStreetMap als Hintergrund
                })
            ],
            view: new ol.View({
                center: ol.proj.fromLonLat([0.0, 0.0]), // Startposition (Europa)
                zoom: 2
            })
        });

        // Popup-Element
        const popup = document.getElementById('popup');

        // GeoJSON-Daten laden
        fetch('geojson_results.json')
            .then(response => response.json())
            .then(data => {
                // GeoJSON-Quelle erstellen
                const geojsonSource = new ol.source.Vector({
                    features: new ol.format.GeoJSON().readFeatures(data, {
                        featureProjection: 'EPSG:3857' // Projektion für Web-Mercator
                    })
                });

                // Layer mit GeoJSON-Daten hinzufügen
                const geojsonLayer = new ol.layer.Vector({
                    source: geojsonSource,
                    style: new ol.style.Style({
                        image: new ol.style.Circle({
                            radius: 6,
                            fill: new ol.style.Fill({ color: 'red' }),
                            stroke: new ol.style.Stroke({ color: 'black', width: 1 })
                        })
                    })
                });

                map.addLayer(geojsonLayer);

                // Feature-Abfrage hinzufügen
                map.on('singleclick', function (event) {
                    // Alle Features an der Klickposition abfragen
                    map.forEachFeatureAtPixel(event.pixel, function (feature) {
                        const properties = feature.getProperties();
                        console.log('Feature Eigenschaften:', properties);

                        // Popup anzeigen
                        popup.style.display = 'block';
                        popup.style.left = event.pixel[0] + 'px';
                        popup.style.top = event.pixel[1] + 'px';
                        popup.innerHTML = `
                            <strong>${properties.name || 'Unbekannt'}</strong><br>
                            <img src="${properties.thumbnail}" alt="${properties.name}" style="width: 300px; height: auto;"><br>
                            Lizenz: <a href="${properties.license}" target="_blank">${properties.license || 'Keine Lizenz'}</a><br>
                            Ersteller: ${properties.creator || 'Unbekannt'}<br>
                            Webseite: <a href="${properties.url}" target="_blank">${properties.url || 'Unbekannt'}</a>
                        `;
                    });
                });

                // Popup ausblenden, wenn die Karte geklickt wird, aber kein Feature vorhanden ist
                map.on('click', function (event) {
                    const features = map.getFeaturesAtPixel(event.pixel);
                    if (!features) {
                        popup.style.display = 'none';
                    }
                });
            })
            .catch(error => console.error('Fehler beim Laden des GeoJSON:', error));
    </script>
</body>

</html>