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, selbst das Ermitteln einer Position zu einer Adresse ist unter zur Hilfename von nominatim.openstreetmap.org möglich.
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).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);
}
}
if (!document.getElementById('leaflet.css')) {
var 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')) {
var script = document.createElement('script');
script.id = 'leaflet.js';
script.src = '/code/OpenStreetMap/leaflet.min.js';
script.addEventListener('load', init);
document.body.appendChild(script);
}
function init() {
var maps = document.querySelectorAll('.map');
for (var i=0; i < maps.length; i++) {
new OpenStreetMap(maps[i]);
}
}
})();
HTML:
<!DOCTYPE html >
<html lang="de">
<head>
<meta charset="utf-8" />
<title>OpenStreetMap</title>
<link rel="stylesheet" href="leaflet.css" />
<script src="leaflet.min.js"></script>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' https://nominatim.openstreetmap.org/; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https://tile.openstreetmap.org/ " />
</head>
<body>
<form id="geoRequest"><label for="name" style="display:inline-block; width:100px;text-align:right">Name:</label><input type="text" id="name" value="Udo Schmal" /><br /><label for="street" style="display:inline-block; width:100px;text-align:right">Strasse:</label><input type="text" name="street" value="Olvengraben 41" /><br /><label for="city" style="display:inline-block; width:100px;text-align:right">City:</label><input type="text" name="city" value="Geldern" /><br /><label for="postalcode" style="display:inline-block; width:100px;text-align:right">Postalcode:</label><input type="text" name="postalcode" value="47608" /><br /><label for="country" style="display:inline-block; width:100px;text-align:right">Country:</label><input type="text" name="country" value="de" /><br /><button type="submit" id="button">add marker</button><br /></form>
<div id="mapDiv" style="width: 800px; height: 500px; max-width:100%;"></div>
<script src="osm-form.js"></script>
</body>
</html>JavaScript:
// coding: utf-8
/** Created by: Udo Schmal | https://www.gocher.me/ */
(function () {
'use strict';
function OpenStreetMap (id) {
this.id = id;
this.map = null;
let mapDiv = document.getElementById('mapDiv');
mapDiv.style.width = '800px';
mapDiv.style.height = '500px';
mapDiv.style.maxWidth = '100%';
}
OpenStreetMap.prototype = {
requestGeo: function (obj, callback) {
/* own Server installation http://nominatim.org/release-docs/latest/admin/Installation/ */
var url = "https://nominatim.openstreetmap.org/search.php";
function serialize(obj) {
var str = [];
for (var p in obj)
if (obj.hasOwnProperty(p) && (['street', 'country', 'city', 'postalcode'].indexOf(p) !== -1)) {
str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
}
return str.join("&") + '&format=json';
}
url = url + '?' + serialize(obj);
var xhr = new XMLHttpRequest();
xhr.open("GET", url, true);
//xhr.setRequestHeader('Access-Control-Allow-Origin', '*');
//xhr.setRequestHeader('Access-Control-Allow-Methods', 'GET, POST');
//xhr.setRequestHeader('Content-Type', 'application/json');
xhr.responseType = 'json';
xhr.addEventListener('load', function (event) {
if (xhr.status === 200) {
if (xhr.response && xhr.response[0]) {
var lat = xhr.response[0].lat;
var lon = xhr.response[0].lon;
var text = xhr.response[0].display_name;
callback(lat, lon, text);
}
}
});
xhr.send();
},
createMap: function (lat, lon, zoom) {
// initialize map
this.map = L.map(this.id).setView([lat, lon], zoom);
// 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: 18,
}).addTo(this.map);
},
setMarker: function (lat, lon, title, text) {
if (this.map) {
// add marker to the map
marker = L.marker([lat, lon]).addTo(this.map);
// add popup to the marker
marker.bindPopup("<strong>" + title + "</strong><br />" + text);
}
},
init: function (obj) {
var self = this;
this.requestGeo(obj, function(lat, lon, text) {
self.createMap(lat, lon, 11);
});
},
addItem: function (obj, title, text) {
var self = this;
var body = text;
this.requestGeo(obj,function(lat, lon, text) {
self.setMarker(lat, lon, title, body || text);
});
},
addItems: function (arr) {
var self = this;
arr.forEach(function (item) {
var title = item.name;
var body = item.street + '<br />' +
item.postalcode + ' ' + item.city;
self.requestGeo(item,function(lat, lon, text) {
self.setMarker(lat, lon, title, body || text);
});
});
}
};
var osm = new OpenStreetMap('mapDiv');
osm.init({country:'de', city:'Geldern', postalcode:'47608'});
var items = [
{name: "Udo Schmal", street: "Olvengraben 41", country: 'de', city: 'Geldern', postalcode: '47608'}
];
osm.addItems(items);
function onSubmit(event) {
event.preventDefault();
var name = '', data = {};
var els = document.getElementById('geoRequest').elements;
for (var i=0; i < els.length; i++) {
if (els[i].name && els[i].value) {
data[els[i].name] = els[i].value;
} else if (els[i].id && els[i].id=="name") {
name = els[i].value;
}
}
osm.addItem(data, name, null);
}
var btn = document.getElementById("button");
btn.addEventListener('click', onSubmit);
})();
