OpenLayers Marker Popups

Popup bubbles appearing when you click a marker. The marker content is set within a feature attribute

<html>
  <head><title>OpenLayers Marker Popups</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());
    
    epsg4326 =  new OpenLayers.Projection("EPSG:4326"); //WGS 1984 projection
    projectTo = map.getProjectionObject(); //The map projection (Spherical Mercator)
   
    var lonLat = new OpenLayers.LonLat( -0.1279688 ,51.5077286 ).transform(epsg4326, projectTo);
          
    
    var zoom=14;
    map.setCenter (lonLat, zoom);

var feature = new OpenLayers.Feature.Vector(
            new OpenLayers.Geometry.Point( -0.119623, 51.503308  ).transform(epsg4326, projectTo),
            {description:'London Eye'} ,
            {externalGraphic: 'img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25  }
        );    
    vectorLayer.addFeatures(feature);

map.addLayer(vectorLayer);
 
    
    //Add a selector control to the vectorLayer with popup functions
    var controls = {
      selector: new OpenLayers.Control.SelectFeature(vectorLayer, { 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 Marker Popups