OpenStreetMap, eine Alternative zu Google Maps

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.

osm.htm HTML (4,42 kByte) 18.07.2020 15:47
<!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>
  </head>
  <body>
    <form id="geoRequest"><label for="label" style="display:inline-block; width:100px;text-align:right">Name:</label><input type="text" id="label" 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>
      function OpenStreetMap (id) {
  this.id = id;
  this.map = null;
}

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 &copy; <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 label = '', 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=="label") {
      label = els[i].value;
    }
  }
  osm.addItem(data, label, null);
}
var btn = document.getElementById("button");
btn.addEventListener('click', onSubmit);
    </script>
  </body>
</html>

Author: , published: , last modified:

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Copyright / License of sources

Copyright (c) 2007-2020, Udo Schmal <udo.schmal@t-online.de>

Permission to use, copy, modify, and/or distribute the software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Service Infos

CMS Info Product Name:
UDOs Webserver
Version:
0.4.2.64
Description:
All in one Webserver
Copyright:
Udo Schmal
Compilation:
Mon, 27. Jul 2020 01:02:54
Development Info Compiler:
Free Pascal FPC 3.3.1
compiled for:
OS:Linux, CPU:x86_64
System Info OS:
Ubuntu 18.04.4 LTS bionic
Hardware Info Model:
Hewlett-Packard HP Pavilion dm4 Notebook PC
CPU Name:
Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz
CPU Type:
x86_64, 1 physical CPU(s), 2 Core(s), 4 logical CPU(s), 1621.147 MHz