[OpenLayers-Users] Vector Feature Clustering

[shitake83]

Hi guys.

Im really struggling to get the cluster feature to work. 

This is how my layer is defined : 
I have a map with 300+ Vector Markers, some of the Markers are at the same
spot (such as Hospitals with multilple Doctors - which is not so unlikely 
).
So I want to be able to have my Features clustered.

vectorLayer = new OpenLayers.Layer.Vector("Markers Layer",{  
                styleMap: new OpenLayers.StyleMap(
                        {"default": new 
OpenLayers.Style(OpenLayers.Util.applyDefaults({
                                        externalGraphic:
"http://openlayers.org/dev/img/marker-green.png";,
                                        graphicOpacity: 1,
                                        rotation: 0,
                                        pointRadius: 10},
                                       
OpenLayers.Feature.Vector.style["default"])),
                                        "select": new OpenLayers.Style({
                                                externalGraphic: 
"http://openlayers.org/dev/img/marker-blue.png"})
                                })
                        });

var strategy = new OpenLayers.Strategy.Cluster({distance: 15, threshold:
3});

Whenever i add the "strategy" to the layer definition, the map stops
showing.
It may seem very easy to complete this task. But ive been struggling over a
week now, eventhough there are some examples (which i dont fully
understand).

If im missing something along the way, feel free to point me into the right
direction.
All help is appreciated. Thanks.

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