Display a Google map with markers linking to pages

gistfile1.txt

// Display a map with markers that link to other pages. Each marker must
// have latitude, longitude and slug properties. There must also be a
// a 'url' option which is used to build the links. The following
// wildcards are replaced in the url: ID (with the id), SLUG (with the 
// slug property), PUBLISHED (with /year/month/day taken from published_at), 
// and START (with /year/month/day taken from start_date). In other words,
// you can pass most array-hydrated Doctrine objects, including Apostrophe
// blog posts and events, and easily generate links back to them.

// The hover text title of the marker is taken from title if present,
// otherwise from name.

// Any markers without a latitude property are ignored. This makes
// it easy to skip events with no location or similar.

// Use the zoom option to specify the google maps zoom level.
// (10 is city-ish, 13 is neighborhood-sized.)

function mapWithMarkers(options) {
  var $map = $(options.selector);
  var markers = options.markers;
  var zoom = options.zoom ? options.zoom : 10;
  var url = options.url;
  var center = { latitude: 0, longitude: 0 };
  var count = 0;
  var i;
  for (i = 0; (i < markers.length); i++)
  {
    if (!markers[i].latitude)
    {
      continue;
    }
    // PHP treats these as strings, therefore json_encodes them as strings, but we need to average them
    markers[i].latitude = parseFloat(markers[i].latitude);
    markers[i].longitude = parseFloat(markers[i].longitude);
    center.latitude += markers[i].latitude;
    center.longitude += markers[i].longitude;
    count++;
  }
  center.latitude /= count;
  center.longitude /= count;

  var map = new google.maps.Map($map[0], {
    zoom: zoom,
    center: new google.maps.LatLng(center.latitude, center.longitude),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });

  var marker;

  for (i = 0; i < markers.length; i++) {  
    if (!markers[i].latitude)
    {
      continue;
    }
    marker = new google.maps.Marker({
      position: new google.maps.LatLng(markers[i].latitude, markers[i].longitude),
      title: markers[i].title ? markers[i].title : markers[i].name,
      map: map
    });

    google.maps.event.addListener(marker, 'click', (function(marker, i) {
      console.log(url + ',' + markers[i].published_at);
      var markerUrl = url.replace('SLUG', markers[i].slug);
      markerUrl = markerUrl.replace('ID', markers[i].id);
      var matches = /^(\d\d\d\d)\-(\d\d)\-(\d\d)/.exec(markers[i].published_at);
      if (matches) {
        markerUrl = markerUrl.replace('PUBLISHED', matches[1] + '/' + matches[2] + '/' + matches[3]);
      }
      var matches = /^(\d\d\d\d)\-(\d\d)\-(\d\d)/.exec(markers[i].start_date);
      if (matches) {
        markerUrl = markerUrl.replace('START', matches[1] + '/' + matches[2] + '/' + matches[3]);
      }
      console.log(markerUrl);
      return function() {
        window.location.href = markerUrl;
      }
    })(marker, i));
  }
};