locator.js

if (!!navigator.geolocation) {
  navigator.geolocation.getCurrentPosition(
    function(position) {  
      var lat = position.coords.latitude;
      var lng = position.coords.longitude;
        $.get('/locate?lat=' + lat + '&lng=' + lng, function(data){
          $('#locations').html(data);  
        });
    }, 
    function(e) {
      alert("Something bad happened, I cannot get your current location.");
    }
  ); 
} else {
  alert("Sorry, your browser is inferior. IE?");
}