Mit einem simpelen Beispiel möche ich hier demonstrieren dass mit wenigen Zeilen Code mit OpenStreetMap bereits eine Kartendarstellung und in Verbindung mit Leaflet eine Positionsmarke möglich ist.
HTML:
<!DOCTYPE html >
<html lang="de">
<head>
<meta charset="utf-8" />
<title>OpenStreetMap</title>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: https://nominatim.openstreetmap.org/; img-src 'self' data: https://tile.openstreetmap.org/" />
</head>
<body>
<div class="map" data-type="osm" data-lat="51.528710" data-lon="6.289250" data-title="Udo Schmal" data-info="Olvengraben 41
47608 Geldern, Deutschland"></div>
<script src="osm.js"></script>
</body>
</html>JavaScript:
// coding: utf-8
/*! Created by: Udo Schmal | https://www.gocher.me/ */
(function () {
'use strict';
function OpenStreetMap (item) {
item.style.width = '100%';
item.style.height = '300px';
let lat = item.dataset.lat;
let lon = item.dataset.lon;
let zoom = item.dataset.zoom || 18;
// initialize map
let map = L.map(item, {scrollWheelZoom: false}).setView([lat, lon], zoom);
if (map) {
// set map tiles source
L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: 'Map data © <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors',
maxZoom: 21,
}).addTo(map);
let title = item.dataset.title;
let info = item.dataset.info;
// add marker to the map
let marker = L.marker([lat, lon]).addTo(map);
// add popup to the marker
marker.bindPopup("<strong>" + title + "</strong><br />" + info);
}
}
var maps = document.querySelectorAll('.map');
if (maps.length > 0) {
function init() {
for (let i=0; i < maps.length; i++) {
new OpenStreetMap(maps[i]);
}
}
if (!document.getElementById('leaflet.css')) {
let style = document.createElement('link');
style.id = 'leaflet.css';
style.type = 'text/css';
style.rel = 'stylesheet';
style.href = '/code/OpenStreetMap/leaflet.css';
document.head.appendChild(style);
}
if (!document.getElementById('leaflet.js')) {
let script = document.createElement('script');
script.id = 'leaflet.js';
script.src = '/code/OpenStreetMap/leaflet.min.js';
script.addEventListener('load', init);
document.body.appendChild(script);
} else {
init();
}
}
})();
