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HTML Geolocation

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  • Difficulty Level : Hard
  • Last Updated : 01 Jun, 2022

In this article, we will know HTML Geolocation, various properties, methods & their implementation through the examples.

Geo-location in HTML5 is used to share the location with some websites and be aware of the exact location. It is mainly used for local businesses, restaurants, or showing locations on the map. It uses JavaScript to give latitude and longitude to the backend server. Most of the browsers support Geolocation API. Geo-location API uses a global navigator object which can be created as follows:

Syntax:

var loc = navigator.geolocation

Location Properties: The following table determines properties used in getCurrentPosition() and their returning values.

Geolocation Methods: The Geolocation has following methods which make it interesting and easier to work.

  • getCurrentPosition(): It fetches the current location of the user.
  • watchPosition(): It fetches periodic updates of the user’s current location.
  • clearWatch(): It cancels a watchPosition call currently in execution.

Example: This example explains returning the user’s current location using the getCurrentPosition() method.

HTML




var loc = navigator.geolocation;
function getLoc() {
loc.getCurrentPosition(showLoc, errHand);
}

The above function can also be written without creating a navigator object as shown below: 

HTML




function getlocation(){
navigator.geolocation.getCurrentPosition(showLoc, errHand);
}

Example: In this example, we simply display the current location with the help of latitude and longitude via HTML Geolocation.

HTML




<!DOCTYPE html>
<html>
 
<body>
   
 
 
<p>Displaying location using Latitude and Longitude</p>
 
 
 
 
  <button class="geeks" onclick="getlocation()">
    Click Me
  </button>
  <p id="demo1"></p>
 
 
 
 
  <script>
    var variable1 = document.getElementById("demo1");
    function getlocation() {
      navigator.geolocation.getCurrentPosition(showLoc);
    }
    function showLoc(pos) {
      variable1.innerHTML =
        "Latitude: " +
        pos.coords.latitude +
        "<br>Longitude: " +
        pos.coords.longitude;
    }
  </script>
</body>
 
</html>

Output:

Getting the current location using latitude and longitude

Error and Rejection Handling: It is very important to handle the errors generated in Geolocation and show a required message when an error occurs. Functions like getCurrentPosition() make use of an error handler to handle the error generated (function errHand as used in the above example). The PositionError object used by the error handler has two properties that let the function handle error efficiently.

  • Code
  • Message

Generated errors in geolocation: 

ErrorError Description
UNKNOWN_ERRRORAn unknown error
PERMISSION_DENIEDThe application doesn’t have the permission to make use of location services
POSITION_UNAVAILABLEThe location of the device is uncertain
TIMEOUTTime to fetch location information exceeded the maximum timeout interval

Example: 

HTML




<!DOCTYPE html>
<html>
 
<head>
  <title>Errors in geolocation</title>
  <style>
    .gfg {
      font-size: 40px;
      font-weight: bold;
      color: #009900;
      margin-left: 20px;
    }
 
    .geeks {
      margin-left: 150px;
    }
 
    p {
      font-size: 20px;
      margin-left: 20px;
    }
  </style>
</head>
 
<body>
  <div class="gfg">GeeksforGeeks</div>
 
   
 
 
<p>Error handling in geolocation</p>
 
 
 
 
  <button class="geeks" onclick="getlocation()">
    Click
  </button>
  <p id="demo1"></p>
 
 
 
 
  <script>
    var variable1 = document.getElementById("demo1");
    function getlocation() {
      navigator.geolocation.getCurrentPosition(showLoc, errHand);
    }
    function showLoc(pos) {
      variable1.innerHTML =
        "Latitude: " +
        pos.coords.latitude +
        "<br>Longitude: " +
        pos.coords.longitude;
    }
 
    function errHand(err) {
      switch (err.code) {
        case err.PERMISSION_DENIED:
          variable1.innerHTML =
            "The application doesn't have the" +
            "permission to make use of location services";
          break;
        case err.POSITION_UNAVAILABLE:
          variable1.innerHTML = "The location of the device is uncertain";
          break;
        case err.TIMEOUT:
          variable1.innerHTML = "The request to get user location timed out";
          break;
        case err.UNKNOWN_ERROR:
          variable1.innerHTML =
            "Time to fetch location information exceeded" +
            "the maximum timeout interval";
          break;
      }
    }
  </script>
</body>
 
</html>

Output:

errors in geolocation

Error handling in Geolocation 

Displaying result in MAP: Displaying location in a map is a very interesting task. These services are used to provide the exact location on the map.

Example: This example describes getting the current position in Google Map with the help of latitude and longitude via HTML Geolocation.

HTML




<!DOCTYPE html>
<html>
 
<head>
  <title>Display location in map</title>
  <style>
    .gfg {
      font-size: 40px;
      font-weight: bold;
      color: #009900;
      margin-left: 20px;
    }
 
    .geeks {
      margin-left: 150px;
    }
 
    p {
      font-size: 20px;
      margin-left: 20px;
    }
  </style>
</head>
 
<body>
  <div class="gfg">GeeksforGeeks</div>
 
   
 
 
<p>Display location in map</p>
 
 
 
 
  <button class="geeks" type="button" onclick="getlocation();">
    Current Position
  </button>
  <div id="demo2"
       style="width: 500px; height: 500px"></div>
  <script src=
  </script>
  <script type="text/javascript">
    function getlocation() {
      if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(showLoc, errHand);
      }
    }
    function showLoc(pos) {
      latt = pos.coords.latitude;
      long = pos.coords.longitude;
      var lattlong = new google.maps.LatLng(latt, long);
      var OPTions = {
        center: lattlong,
        zoom: 10,
        mapTypeControl: true,
        navigationControlOptions: {
          style: google.maps.NavigationControlStyle.SMALL,
        },
      };
      var mapg = new google.maps.Map(
        document.getElementById("demo2"),
        OPTions
      );
      var markerg = new google.maps.Marker({
        position: lattlong,
        map: mapg,
        title: "You are here!",
      });
    }
 
    function errHand(err) {
      switch (err.code) {
        case err.PERMISSION_DENIED:
          result.innerHTML =
            "The application doesn't have the permission" +
            "to make use of location services";
          break;
        case err.POSITION_UNAVAILABLE:
          result.innerHTML = "The location of the device is uncertain";
          break;
        case err.TIMEOUT:
          result.innerHTML = "The request to get user location timed out";
          break;
        case err.UNKNOWN_ERROR:
          result.innerHTML =
            "Time to fetch location information exceeded" +
            "the maximum timeout interval";
          break;
      }
    }
  </script>
</body>
 
</html>

Output:

geolocation map

Getting the current position in Google Map

Supported Browsers:

  • Google Chrome 5 and above
  • Microsoft Edge 12 and above
  • Firefox 3.5 and above
  • Internet Explorer 9 and above
  • Opera 10.6 and above
  • Safari 5 and above


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