OpenLayers KML

Populate vector layer with data from a KML file. Also bind popup events to the display the description attributes. The KML file (this example taken from mapperz originally) must be served under the same domain name.

<html>
  <head><title>OpenLayers KML Example</title></head>
  <body>
  <div id="mapdiv"></div>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/openlayers/2.11/lib/OpenLayers.js"></script>           
  
  <script>
    map = new OpenLayers.Map("mapdiv");
    map.addLayer(new OpenLayers.Layer.OSM());
       
    var kmllayer = new OpenLayers.Layer.Vector("KML", {
            strategies: [new OpenLayers.Strategy.Fixed()],
            protocol: new OpenLayers.Protocol.HTTP({
                url: "./mapperz-kml-example.kml",
                format: new OpenLayers.Format.KML({
                    extractStyles: true, 
                    extractAttributes: true,
                    maxDepth: 2
                })
            })
        });
        
    map.addLayer(kmllayer);
    
    //Set start centrepoint and zoom
    //TODO: Is it possible to just zoom to extents of KML objects instead?
    
    var lonLat = new OpenLayers.LonLat( -0.1279688 ,51.5077286 )
          .transform(
            new OpenLayers.Projection("EPSG:4326"), // transform from WGS 1984
            map.getProjectionObject() // to Spherical Mercator Projection
          );
    var zoom=14;
    map.setCenter (lonLat, zoom);  
    
    //Add a selector control to the kmllayer with popup functions
    var controls = {
      selector: new OpenLayers.Control.SelectFeature(kmllayer, { onSelect: createPopup, onUnselect: destroyPopup })
    };

function createPopup(feature) {
      feature.popup = new OpenLayers.Popup.FramedCloud("pop",
          feature.geometry.getBounds().getCenterLonLat(),
          null,
          '<div class="markerContent">'+feature.attributes.description+'</div>',
          null,
          true,
          function() { controls['selector'].unselectAll(); }
      );
      //feature.popup.closeOnMove = true;
      map.addPopup(feature.popup);
    }

function destroyPopup(feature) {
      feature.popup.destroy();
      feature.popup = null;
    }
    
    map.addControl(controls['selector']);
    controls['selector'].activate();
  </script>
  
</body></html>

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Harry Wood

OpenLayers KML