<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.css"  data-require="leaflet@0.7.3" data-semver="0.7.3" />
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div id="map"></div>
    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.js" data-require="leaflet@0.7.3" data-semver="0.7.3"></script>
    <script type="text/javascript" src="script.js"></script>
  </body>
</html>
var map = L.map('map', {
  'center': [0, 0],
  'zoom': 0,
  'layers': [
    L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
      'attribution': 'Map data &copy; OpenStreetMap contributors'
    })
  ]
});

var data = [
  [[-60, 0],[60, 0]],
  [[0, -60],[0, 60]]
];

var group = L.layerGroup().addTo(map);

function isEmpty(obj) {
    for(var prop in obj) {
        if(obj.hasOwnProperty(prop))
            return false;
    }
    return true;
}

data.forEach(function (points) {

  var polyline = L.polyline(
    points, {
      weight: 6,
      clickable: true
    }
  ).addTo(map);
  
  polyline.on('click', function (e) {
    if (group.getLayers().length === 0) {
      e.target._latlngs.forEach(function (latlng) {
        group.addLayer(L.marker(latlng));
      });
    } else {
      group.clearLayers();
    }
  });

});
body {
  margin: 0;
}
html, body, #map {
  height: 100%;
}