[OpenLayers-Users] Vector Filters

[Brad Spencer]

List,

 

I have successfully built a layer of points and styled them with a stylemap.
However, I now want to filter these after they have been loaded via an
interactive user process. 

 

To test filtering I assume you have to include a filter in the vector layer
definition and then later you can redefine it and refresh the vector layer
with the new filter active?

 

To test this, I am trying to make sure that there is a filter on the new
vector layer at load time just to see that my assumptions are correct.
Whilst the code runs it does not filter. I have added an attribute called
'color' to the array used to build the layer and assume it is the property
value needed in the Filter? 

 

I can't see any examples that do exactly this so thought I would seek advice
from the pond.

 

// show the first color value

alert('Color = '+sortedPoints[0].attributes.color);

 

// create the vector layer and apply the styleMap at the same time

userMarkers = new OpenLayers.Layer.Vector( "Vector Markers", 

{              styleMap: styleMap, 

                rendererOptions: {zIndexing: true}

                ,filter: new OpenLayers.Filter.Comparison

                ({

                                type: OpenLayers.Filter.Comparison.EQUAL_TO,

                                property:'color', 

                                value:'#FF0000'

                })

});

 

// pointFeature is the array of sorted point objects to be added as vector
markers

userMarkers.addFeatures(sortedPoints);


map.addLayer(userMarkers);

                

I must be doing something very wrong here. Can anyone quickly see a problem?

 

Cheers, Brad.

 

 

 

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