[OpenLayers-Users] Interactive hot spots on a map for large, complex vector geometries

[Phil Scadden]

> I guess I forgot to mention: the idea is to have geometries 
> highlighting on hover / mouse-over...
Yep. I do that. Do WFSgetfeature in a hover handler.

eg
    hoverHandler = new OpenLayers.Handler.Hover({
         map:map
     },{});
     hoverHandler.callbacks= {
         "pause":function(e){
   // do WFSgetfeature here
         }
     };
hoverHandler.activate();


Or,
  hoverFeatures =  new OpenLayers.Control.GetFeature({
                 protocol:myWfsProtocol,
                 hover: true,
                 propertyNames:myListOfFields,
                 click:false,
                 maxFeatures:1
               });
               hoverFeatures.events.register("hoverfeature", this, 
showFeature);
               hoverFeatures.events.register("outfeature", this, 
function(evt) { clearFeature;});

Or, have serverside function that is called on hover, which in turns 
make the WFS call to fetch the geometry and simplifies it based on zoom 
before passing up has GML. Ie do everything serverside if possible since 
js is so slow.

You might want to look at the SLDSelect control which could also be 
called on Hover.

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