var lat;
var lng;

    $(document).ready(function(){
        if (navigator.geolocation) {
          navigator.geolocation.getCurrentPosition(function(position) {

            lat = position.coords.latitude;
            lng = position.coords.longitude;

          }, function() {

          });
        } else {
          lat = '0';
          lng = '0';
        }

        if(lat != undefined){
        //Perform Ajax request.
        $.ajax({
            url: '<?= base_url() ?>index.php/home/latlng_session',
            type: 'get',
            data: {latitude: lat, longitude: lng},

            success: function(data){
            alert(lat+','+lng);
            },
        });
        }



    });