gistfile1.js

// Google Maps Directions combinator

function googleMapsDirectionsCombinator(start, elementId){
  var directionDisplay;
  var directionsService = new google.maps.DirectionsService();
  var map;
  var start = start;
  var elementId = elementId; 
  var elementIdWithHash = "#" + elementId;

  return function(){  

    directionsDisplay = new google.maps.DirectionsRenderer();
    var london = new google.maps.LatLng(50.850033, -0.1800523);
    var myOptions = {
      zoom:7,
      mapTypeId: google.maps.MapTypeId.ROADMAP,
      center: london
    }
    map = new google.maps.Map(document.getElementById(elementId), myOptions);
    directionsDisplay.setMap(map);
  
    var end = $(elementIdWithHash).data("destination");
    var request = {
        origin:start, 
        destination:end,
        travelMode: google.maps.DirectionsTravelMode.WALKING
    };
    directionsService.route(request, function(response, status) {
      if (status == google.maps.DirectionsStatus.OK) {
        directionsDisplay.setDirections(response);
      }
    });

  }
}

// user combinator to create function to display directions
var googleMapsDirections = googleMapsDirectionsCombinator("34-120, Andrychow, Malopolska, Kosciuszki 14", "map");