[OpenLayers-Users] Add background features to map

[Phil Scadden]

You can do most of this with just WMS. It depends to some extent on your 
tolerance for how long mouse is hovering before display.

First off, a hell of lot of geometry is not that big an issue to caching 
WMS server (eg Geoserver). Only images are passed. Your choice.

Second, you have a couple of options for displaying features on hover or 
click. If the geometry is very complex (over 100 nodes), then consider 
using the SLDSelect Control 
http://openlayers.org/dev/examples/SLDSelect.html with a hover handler. 
This does it all with WMS. Otherwise, set up a GetFeature control.
eg
                hoverFeatures =  new OpenLayers.Control.GetFeature({
                    protocol: myWfsProtocol,
                   hover: true,
                   click:false,
                   maxFeatures:1
                });
                hoverFeatures.events.register("hoverfeature", this, 
displayTheFeature);
                hoverFeatures.events.register("outfeature", this, 
unDisplayTheFeature);
the event handlers will draw the feature from the gml geometry


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