location detection in web browser

admirer picture admirer · Nov 2, 2012 · Viewed 16.6k times · Source

I am searching for a method to locate the user location while visiting my website, i have tried Maxmind but they seems to be inaccurate in the city level. the information i want is (Country, City, longitude, latitude) i want the country and the city to be very accurate if possible.

I have also used HTML5 but the problem that it asks my user to share location information which seems to me bad solution. (althougth i got very accurate results)

Any solutions?

Notice: i found google search got an accurate detection and without "ask for sharing my location", but i didn't find any api to use google service

Answer

Naveen Babu picture Naveen Babu · Nov 2, 2012

This is a code i found for a tutorial for Geo Location using Google maps.. Hope this is useful.

This works on the way you connect to the network.

  • if you use a Boradband ISP what gives you an fixed ip your location will be more accurate.
  • if you use mobile device to connect to internet, the Location of the nearest Mobile tower from which your network gets the signal will be shown

Example for HTML5 Geolocation

<!DOCTYPE html>
<html>
<head>
<title>GeoLocation Demo</title>
<meta charset="utf-8"/>
<script src="http://maps.google.com/maps/api/js?sensor=false" type="text/javascript"></script>
<script>
  var startPos;
  var map;

  function init() {
      if (navigator.geolocation) {
          document.getElementById("support").innerHTML = "<p style='color:green'>Great! This browser supports HTML5 Geolocation</p>";
          navigator.geolocation.getCurrentPosition(updateLocation, handleLocationError, {
              timeout: 50000
          });
          //navigator.geolocation.watchPosition(updateCurrPosition,handleLocationError);

      } else {
          document.getElementById("support").innerHTML = "<p style='color:red'>Oops! This browser does not support HTML5 Geolocation</p>";
      }
  }

  function updateLocation(position) {
      startPos = position;
      var latitude = position.coords.latitude;
      var longitude = position.coords.longitude;

      //document.getElementById("startLat").innerHTML = latitude;
      //document.getElementById("startLon").innerHTML = longitude;

      var coords = new google.maps.LatLng(latitude, longitude);

      var mapOptions = {
          zoom: 10,
          center: coords,
          mapTypeControl: false,
          navigationControlOptions: {
              style: google.maps.NavigationControlStyle.SMALL
          },
          mapTypeId: google.maps.MapTypeId.ROADMAP
      };

      map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);

      var marker = new google.maps.Marker({
          position: coords,
          map: map,
          title: "Your current location!"
      });

  }

  function handleLocationError(error) {
      switch (error.code) {
          case 0:
              updateStatus("There was an error while retrieving your location: " + error.message);
              break;

          case 1:
              updateStatus("The user prevented this page from retrieving the location.");
              break;

          case 2:
              updateStatus("The browser was unable to determine your location: " + error.message);

              break;

          case 3:

              updateStatus("The browser timed out before retrieving the location.");

              break;
      }
  }

  function updateStatus(msg) {
      document.getElementById("divStatus").innerHTML = msg;
  }
</script>
</head>

<body onload="init()">  
<div id="support"></div>
<div id="divStatus"></div>
<div id="map_canvas" style="width:600px;height:400px;"></div>
</body>
</html>