geolocation.js

var studios = {
  nyc: {
    coords: {
      latitude: 40.748224,
      longitude: -73.995730
    }
  },
  london: {
    coords: {
      latitude: 51.523910,
      longitude: -0.076880
    }
  },
  malmo: {
    coords: {
      latitude: 55.600824,
      longitude: 13.001198
    }
  }
};

var orderByDistance = {};


var getLocation = function() {
  var currentPosition;

  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(location) {
      // Set Current Position
      currentPosition = location;

      for (var key in studios) {
        var studio = {
          name: key,
          distance: calculateDistance(currentPosition, studios[key])
        };

        studios[key].distance = studio.distance;

        if (orderByDistance.hasOwnProperty("distance") === false || orderByDistance.distance > studio.distance) {
          orderByDistance = studio;
        }
      }

      console.log(studios);

      // console.log(firstStudio);

      // Arrange Footer
      $('.footer__contact__item[data-studio="' + orderByDistance.name + '"]').insertBefore($('.footer__contact__item[data-studio]:first'));
    });
  }
  else {
    console.log("Default");
  }
}

var calculateDistance = function(posA, posB) {
  var radius = 6371,
      latitudeA = posA.coords.latitude,
      latitudeB = posB.coords.latitude,
      longitudeA = posA.coords.longitude,
      longitudeB = posB.coords.longitude;

  var dLat = toRadians(latitudeB - latitudeA);
  var dLon = toRadians(longitudeB - longitudeB);

  var lat1 = toRadians(latitudeA);
  var lat2 = toRadians(latitudeB);

  var a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2);

  var angularDistance = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));

  var d = radius * angularDistance;

  return d;
}

var toRadians = function(value) {
  return value * (Math.PI / 180)
}

$(document).ready(function() {
  getLocation();
});