[OpenLayers-Users] Cluster Strategy WKT Vectors - not clustering

[Andreas Hocevar]

Hi,

there are several things wrong in your code.

if what you pasted below is your code, then you should get JavaScript
errors because you messed up the braces:

On Tue, Mar 3, 2009 at 5:21 PM, RFeagin
<ryan.feagin at peachtreegeographics.com> wrote:
>
> I am having problems with getting a clustering strategy to work on my vector
> layer.  Here is my layer definition...
>        vResultsLayer = new OpenLayers.Layer.Vector("Results"),
>                    { strategies: [new OpenLayers.Strategy.Fixed(),
>                                       new OpenLayers.Strategy.Cluster()],
>                       'sphericalMercator': true,
>                        styleMap: new OpenLayers.StyleMap({
>                            "default": style,
>                            "select": {
>                                fillColor: "#8aeeef",
>                                strokeColor: "#32a8a9"
>                            }
>                        })
>                    };

This should read

       vResultsLayer = new OpenLayers.Layer.Vector("Results",
                   { strategies: [new OpenLayers.Strategy.Fixed(),
                                      new OpenLayers.Strategy.Cluster()],
                      'sphericalMercator': true,
                       styleMap: new OpenLayers.StyleMap({
                           "default": style,
                           "select": {
                               fillColor: "#8aeeef",
                               strokeColor: "#32a8a9"
                           }
                       })
                   });


> and here is my code that creates the features...
>    getWKT_Results: function() {
>        respWKT = OpenLayers.Request.GET({
>            url: "Map_GetQueryResult.ashx?" + guid(),
>            success: function(request) {
>                wkt = new OpenLayers.Format.WKT({
>                    'internalProjection': new
> OpenLayers.Projection("EPSG:900913"),
>                    'externalProjection': new
> OpenLayers.Projection("EPSG:4326")
>                });
>
>                format = new OpenLayers.Format.XML();
>                var xmlParser = format.read(respWKT.responseText);
>
>                var featureNodes = format.getElementsByTagNameNS(xmlParser,
> '*', 'QueryResults');
>
>                var ftrArray = new Array();
>
>                for (var i = 0; i < format.getElementsByTagNameNS(xmlParser,
> '*', 'QueryResults').length; i++) {
>                    try {
>
> ftrArray.push(wkt.read(format.getElementsByTagNameNS(featureNodes[i], '*',
> 'WKT')[0].text)[0]);
>                        ftrArray[ftrArray.length - 1].fid =
> format.getElementsByTagNameNS(featureNodes[i], '*', 'featureID')[0].text;
>                    }
>                    catch (e) {
>                        test = e.toString();
>                    }
>                }
>                vResultsLayer .addFeatures(ftrArray);
>                //try to force clustering because it isn't getting set for
> the layer for some reason
>                //adding these lines did force clustering on, but caused
> "this.layer.events" error trying to unregister "beforefeaturesadded" event
>                //vResultsLayer .strategies = [new
> OpenLayers.Strategy.Cluster()];
>                //vResultsLayer .strategies[0].active = true;
>                //vResultsLayer .strategies[0].clustering = true;
>            }

You shouldn't do this manually. Add a HTTP Protocol with a WKT Format
to your layer. See
http://www.openlayers.org/dev/examples/behavior-fixed-http-gml.html
for a similar use case. You just have to replace the Fixed strategy
with your Cluster strategy and the GML format with a WKT format.

Regards,
Andreas.


-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.