CODEWITHSUNDEEP
javascriptphpjquery-mobilegps
JOHN
JOHN

Reputation: 51

Check if user device's GPS is on

I am developing an app using jQuery Mobile with PHP. I am not using Phonegap or other frameworks. I need to find user's geolocation. If user device's GPS is off, then I cant get a location. now I need to find user device's GPS is on or off.

this is what i using now.

function getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(showPosition);
  } else { 
    x.innerHTML = "Geolocation is not supported by this browser.";
  }
}

function showPosition(position) {
  var lat=position.coords.latitude;
  var long=position.coords.longitude;
}

Upvotes: 5

Views: 12085

Answers (4)

Michał Gacka
Michał Gacka

Reputation: 3091

There is no way to check if the device has a GPS module or if it has it enabled through the browser's API. Your laptop will, for example, try to estimate the position based on the IP address with very poor accuracy.

You can, however, use a trick that will likely be good enough for many applications: instead of using the getCurrentPosition(), use the watchPosition() function with an options object { enableHighAccuracy: true } and set a threshold of accuracy that the measurement has to reach for you to accept it as most likely a result based on the GPS module.

What happens when you start to listen to the watchPosition() with enableHighAccuracy set to true is that if GPS module is available, the API will let it know that you're trying to get a measurement and after up to a few seconds the accuracy distance will go from very high (often thousands of meters - based on IP address, cell tower triangulation, etc.) to a very low (few meters - based on the GPS) and that means that the GPS kicked in. If the accuracy stays at hundreds or thousands of meters, it probably means that there is no GPS module available.

Here's the documentation for the GeolocationCoordinates object (the result within the callback passed to the watchPosition()) which comes with the accuracy field. I wrote a longer post that also contains a code snippet showing how I use the API within React.

Upvotes: 5

Krishna Wadhwani
Krishna Wadhwani

Reputation: 123

I Implemented This In Real World Project

KMaps-API GPS.js

<script>


function getLocationw() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(showPositionw);
  } else { 
    x.innerHTML = "Something Is Wrong";
  }
}

function showPositionw(position) {
    
  lat = position.coords.latitude;
  if(lat != null){
    document.write('<center><div class="alert alert-info" role="alert"> Please Turn On Your GPS </div></center>')
  }  
 
}

getLocationw();

</script>

Upvotes: 0

RSSHAH
RSSHAH

Reputation: 69

You can call this function on load

      // Function to get location
      function getLocation(){
          navigator.geolocation.getCurrentPosition(function (pos) {
              var lat = pos.coords.latitude;
              var lng = pos.coords.longitude;
              if (lat == null) {
                  alert("GPS not activated!");
              } else {
                  alert("Latitude: "+ lat + " , Longitude: " + lng );
              }
          });
      }

Upvotes: 4

Nair
Nair

Reputation: 81

I just solved this one. I am using:

navigator.geolocation.getCurrentPosition(successCallback, errorCallback, {maximumAge: 60000});

In the successCallback i written the codes for what it should do once I got the positions and in the error callback i wrote a simple alert message to prompt the user to turn the GPS on.

Upvotes: 3

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