[OpenLayers-Users] Clustering strategy not applying to feature layer
Leon D'mello
leondmello at gmail.com
Mon Mar 5 09:25:39 EST 2012
Hello All,
I'm trying to apply clustering strategy to a feature layer which i
construct from lat/long points returned in JSON by a web service. When the
map loads, all i can see is the string 'undefined' at each and every point.
I think there is some problem with the activation of the cluster strategy.
I debugged the functions and found out that there is a problem with the
code line which uses " feature.attributes.count". Any one knows how do i
get the clustering strategy to work?
I have included the code which I have written below. Any help will be
appreciated.
resultObject = $.parseJSON(jsonResponse.d);
var point;
var feature_point;
var proj = new OpenLayers.Projection("EPSG:4326");
var vector_layer = new OpenLayers.Layer.Vector('Customer Points
Layer', { strategies: [new OpenLayers.Strategy.Cluster()]});
//Add data points to the feature layer by converting to the
appropriate projection
for (var customerCount = 0; customerCount < resultObject.length;
customerCount += 1) {
point = new
OpenLayers.Geometry.Point(resultObject[customerCount].Longitude,
resultObject[customerCount].Latitude);
point.transform(proj, map.getProjectionObject());
feature_point = new OpenLayers.Feature.Vector(point);
vector_layer.addFeatures([feature_point]);
}
var vector_style = new OpenLayers.Style({
fillColor: '#669933',
fillOpacity: .8,
fontColor: '#f0f0f0',
fontFamily: 'arial, sans-serif',
fontSize: '.9em',
fontWeight: 'bold',
label: '${num_points}',
pointRadius: '${point_radius}',
strokeColor: '#aaee77',
strokeWidth: 3
},
{
context: {
num_points: function (feature) { return
feature.attributes.count; },
point_radius: function (feature) {
return 9 + (feature.attributes.count)
}
}
});
var vector_style_map = new OpenLayers.StyleMap({
'default': vector_style
});
vector_layer.styleMap = vector_style_map;
map.addLayer(vector_layer);
--
Thanks,
Leon Dmello.
(+91) 779 832 8248
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