[OpenLayers-Users] identifying map regions/features on the client side

[Graham Carlyle]

Ah excellent.. this seems to be a 2.6 bit of functionality, time to
check out the release candidate!

thanks,
Graham

On Fri, 2008-04-11 at 11:16 -0400, Christopher Schmidt wrote:
> On Fri, Apr 11, 2008 at 04:09:35PM +0100, Graham Carlyle wrote:
> > So I'm thinking a new layer type might provide this which would use much
> > the same info as a vector layer uses (GML, KML etc.) but instead of
> > rendering this vector info it would provide methods to identify the
> > feature at an x,y location.
> 
> You don't even need a layer.
> 
> 1. When your application loads, load your country data into the client,
>    using Format.GML, Format.GeoJSON, etc. Even in relatively slow browsers,
>    this is probably only a few seconds of time.
> 
> 2. When a user hovers, do a:
>  
>   var selectedCountry = null;  
>   var g = new OpenLayers.Geometry.Point(x, y);
>   for (var i=0; i < myFeatureList.length; i++) {
>      if (myFeatureList[i].geometry.intersects(g)) {
>         selectedCountry = myFeatureList[i].attributes.country_code;
>      }
>   }
> 
> Then display your information.  
> 
> Regards,