Find nearby

<div class="selector" id="store-chooser" style="width: 300px;">
    <select id="store" class="form-control" name="store">
        {foreach $stores as $store}
            <option class="storeValues" value="" data-latitude="{$store.latitude}" data-longitude="{$store.longitude}">{$store.name|escape:'html':'UTF-8'}</option>
        {/foreach}
    </select>
</div>


{if $geolocalization == 'true'}
    <script type="text/javascript">
        var set = new Array();

        $( "#store .storeValues" ).each(function(index) {
            var currentSet = new Array();
            currentSet.push($(this).data("latitude"), $(this).data("longitude"));
            set.push(currentSet);
        });

        jQuery.ajax( {
          url: '//freegeoip.net/json/',
          type: 'POST',
          dataType: 'jsonp',
          success: function(location) {
            var city = location.city;
            var ip = location.ip;
            var lat = location.latitude;
            var lon = location.longitude;
            var founded = UserLocation( lat, lon, set );

            console.log("trovato = " + founded);
          }
        } );

        function NearestCity( latitude, longitude, set ) {
            var mindif = 99999;
            var closest;

            for (index = 0; index < set.length; ++index) {
                var dif =  PythagorasEquirectangular( latitude, longitude, set[ index ][ 0 ], set[ index ][ 1 ] );

                if ( dif < mindif ) {
                    closest = index;
                    mindif = dif;
                }
            }

            return set[closest];
        }

        function UserLocation( latitude, longitude, set ) {
            NearestCity( latitude, longitude, set );
        }

        function Deg2Rad( deg ) {
           return deg * Math.PI / 180;
        }

        function PythagorasEquirectangular( lat1, lon1, lat2, lon2 ) {
            lat1 = Deg2Rad(lat1);
            lat2 = Deg2Rad(lat2);
            lon1 = Deg2Rad(lon1);
            lon2 = Deg2Rad(lon2);
            var R = 6371; // km
            var x = (lon2-lon1) * Math.cos((lat1+lat2)/2);
            var y = (lat2-lat1);
            var d = Math.sqrt(x*x + y*y) * R;
            return d;
        }
    </script>
{/if}


{if $geolocalization != 'true'}
    <script type="text/javascript">
        console.warn('Store Chooser: localizzazione disattivata!');
    </script>
{/if}