Is there a way to display both user location and my markers on a map simultaneously?

I am currently able to display markers on a map using this code, but I am struggling to figure out how to also show the user's location on the map. The Google Maps API developer instructions have not been helpful in achieving this. Can someone please assist me with integrating the user's location along with the existing markers? Your help would be greatly appreciated. Thank you, Jacob

<script type="text/javascript">
var customIcons = {
  point: {
    icon: 'img/points.png',
    shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
  },
};
function load() {
  var map = new google.maps.Map(document.getElementById("map"), {
    center: new google.maps.LatLng(53.8, -1.55),
    zoom: 14,
    mapTypeId: 'roadmap'
  });
  var infoWindow = new google.maps.InfoWindow;
  // Change this depending on the name of your PHP file
  downloadUrl("phpsqlajax_genxml.php", function(data) {
    var xml = data.responseXML;
    var markers = xml.documentElement.getElementsByTagName("marker");
    for (var i = 0; i < markers.length; i++) {
      var name = markers[i].getAttribute("name");
      var type = markers[i].getAttribute("type");
      var point = new google.maps.LatLng(
          parseFloat(markers[i].getAttribute("lat")),
          parseFloat(markers[i].getAttribute("lng")));
      var html = "<b>" + name + "</b> <br/>" + type;
      var icon = customIcons[type] || {};
      var marker = new google.maps.Marker({
        map: map,
        position: point,
        icon: icon.icon,
        shadow: icon.shadow
      });
      bindInfoWindow(marker, map, infoWindow, html);
    }
  });
}
function bindInfoWindow(marker, map, infoWindow, html) {
  google.maps.event.addListener(marker, 'click', function() {
    infoWindow.setContent(html);
    infoWindow.open(map, marker);
  });
}
function downloadUrl(url, callback) {
  var request = window.ActiveXObject ?
      new ActiveXObject('Microsoft.XMLHTTP') :
      new XMLHttpRequest;
  request.onreadystatechange = function() {
    if (request.readyState == 4) {
      request.onreadystatechange = doNothing;
      callback(request, request.status);
    }
  };
  request.open('GET', url, true);
  request.send(null);

}

function doNothing() {}
//]]>

Answer №1

To implement this functionality, you can create an initialization function as shown below or simply extract the necessary section:

function initialize() {

   if(google.loader.ClientLocation) {
      loc.lat = google.loader.ClientLocation.latitude;
      loc.lng = google.loader.ClientLocation.longitude;

      var latlng = new google.maps.LatLng(loc.lat, loc.lng);

      var myOptions = {
        zoom: 15,
        mapTypeId: google.maps.MapTypeId.ROADMAP
     };
     var map = new google.maps.Map(document.getElementById("map"), myOptions);
     var marker = new google.maps.Marker({
      position: latlng,
      map: map
      });

  }
}

Answer №2

Utilize the geolocation-marker library available at this link. It simplifies this task significantly.

Note: The library was created by me.

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