index_ueb_webmap5.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de-de">
	<head>
		<title>Webmap &Uuml;bung 5 - Overpass Query</title>
		<meta charset="UTF-8">
		<meta http-equiv="content-script-type" content="text/javascript" />
		<meta http-equiv="content-style-type" content="text/css" />
		<meta http-equiv="content-language" content="en" />
		<link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.3/dist/leaflet.css" />
		<link rel="stylesheet" type="text/css" href="map.css"></link>
		<script src="https://unpkg.com/leaflet@1.0.3/dist/leaflet.js"></script>
		<script src='https://api.mapbox.com/mapbox-gl-js/v0.34.0/mapbox-gl.js'></script>
		<script src='https://api.mapbox.com/mapbox.js/v3.0.1/mapbox.js'></script>
		<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
		
		<script type="text/javascript" src="JS/config.js"></script>
		<script type="text/javascript" src="JS/osmtogeojson.js"></script>
	</head>
	<body>
		<p>Webmap &Uuml;bung 5 - Overpass Query</p>
		<div id="featureCount">Treffer: </div>
		<div id="overpassMap"/>
 
			<div class="leaflet-control-container">
				<div class="leaflet-top leaflet-right">
					<div id="overpass-api-controls" class="leaflet-bar leaflet-control">
						<select id="queryDrop">
							<option value="amenity=charging_station">amenity=charging_station</option>
							<option value="historic=castle">historic=castle</option>
							<option value="leisure=playground">leisure=playground</option>
							<option value="natural=peak">natural=peak</option>
						</select>
						<input id="query-button" type="button" value="Laden">
					</div>
				</div>
			</div>
		<script>
			var map = L.map('overpassMap', {
				center: [47.22320, 8.81744],
				zoom: 17,
				layers: [mapboxStreets]
			});
			
			function buildOverpassApiUrl(map, overpassQuery) {
				var bounds = map.getBounds().getSouth() + ',' + map.getBounds().getWest() + ',' + map.getBounds().getNorth() + ',' + map.getBounds().getEast();
				nodeQuery = 'node[' + overpassQuery + '](' + bounds + ');';
				var wayQuery = 'way[' + overpassQuery + '](' + bounds + ');';
				var relationQuery = 'relation[' + overpassQuery + '](' + bounds + ');';
				var query = '?data=[out:json][timeout:25];(' + nodeQuery + wayQuery + relationQuery + ');out body geom;';
				var baseUrl = 'http://overpass-api.de/api/interpreter';
				var resultUrl = baseUrl + query;
				return resultUrl;
			}
			
			$('#query-button').click(function() {
				$('*').css('cursor', 'progress');
				$('#featureCount').html("Treffer: ");
				
				var $query = $('#queryDrop').val();
				var overpassApiUrl = buildOverpassApiUrl(map, $query);
				var featureCount = 0;
				
				$('*').css('cursor', 'default');
				
				$.get(overpassApiUrl, function(osmDataAsJson) {
					var geojson = osmtogeojson(osmDataAsJson);
					var layer = L.geoJson(geojson, {
						style: function (feature) {
							return {color: "#ff0000"};
						},
						filter: function (feature, layer) {
							var isPolygon = (feature.geometry) && (feature.geometry.type !== undefined) && (feature.geometry.type === "Polygon");
							if (isPolygon) {
								feature.geometry.type = "Point";
								var polygonCenter = L.latLngBounds(feature.geometry.coordinates[0]).getCenter();
								feature.geometry.coordinates = [ polygonCenter.lat, polygonCenter.lng ];
							}
							return true;
						},
						onEachFeature: function (feature, layer) {
							featureCount++;
							var popupContent = "<table>";
							var keys = Object.keys(feature.properties.tags);
							popupContent = popupContent + "<tr><th>@id</th><td>" + feature.properties.type + "/" + feature.properties.id + "</td></tr>";
							
							keys.forEach(function (key) {
								var elementContent = feature.properties.tags[key];
								if (elementContent.startsWith("http")) {
									popupContent = popupContent + "<tr><th>" + key + "</th><td>" + "<a href=" + elementContent + ">Link</a>" + "</td></tr>";
								}
								if (!popupContent.includes(elementContent)) {
									popupContent = popupContent + "<tr><th>" + key + "</th><td>" + elementContent + "</td></tr>";
								}
								layer.bindPopup(popupContent);
							});
						}
					}).addTo(map);
					$('#featureCount').append(featureCount);
				});
			});
		</script>
	</body>
</html>