Hi Myeonghun,
I think with the rectangle used as a BBOx you could create a BBOX filter and create a WFS layer for your buildings with that BBOX filter This layer could have a separate style so the features are highlighted. Within this layer all information about the highlighted features is available (if you set extractAttributes to true of course) So you could show a popup on hover or so Cheers Kris From: Myeong Hun Jeong [mailto:mhjeon...@gmail.com] Sent: Monday, April 27, 2009 2:09 PM To: Kris Geusebroek Cc: users@openlayers.org Subject: Re: [OpenLayers-Users] How to use OpenLayers requesting WFS with Spatial Operations Thanks Kris Geusebroek. In my case, I loaded WMS building layer because WFS layer loading time is big. After loading WMS layer, I draw rectangle on the map. After drawing rectangle, what I want to do is that I want to get information for building features within the rectangle and I also would like to select or highlight features within the rectangle. What shoul I do? Best regards, Myeonghun Jeong. 2009/4/25 Myeong Hun Jeong <mhjeon...@gmail.com> Hi Roald, There are two things I want to know. 1. How to send WFS requests to server with openlayers? I know the way to load WFS layers when I initialize map, but after loading layers, I don't know how to request WFS with Spatial Operations in OpenLayers. 2. I also want to know the way to display a WFS layer on my map that automatically requests the correct features within the BBOX of the viewport? Thanks in advance. Best Regrards, Myeonghun Jeong. 2009/4/25 Roald de Wit <roald.de...@lisasoft.com> Hi Myeonghun Jeong, Can you explain what you try to do? Do you want to display a WFS layer on your map that automatically requests the correct features within the BBOX of the viewport or do you want to have control over what BBOX you send to the WFS server and send your WFS 'manually'? Maybe it is good to have a look at some examples (type WFS in the search box): [1]. Regards, Roald [1] http://www.openlayers.org/dev/examples/ Myeong Hun Jeong wrote: Dear list. I want to know how to use openlayers when I request WFS with Spatial Operations. For example, at GeoServer Demo Request page, I can fin WFS_getFeatureBBox01.1.url and WFS_getFeatureBBox01.1.xml samples. So, the request is that http://localhost:8888/geoserver/wfs?request=GetFeature&version=1.0.0&typ eName=topp:states&propertyName=STATE_NAME,PERSONS&BBOX=-75.102613,40.212 597,-72.361859,41.512517 <http://localhost:8888/geoserver/wfs?request=GetFeature&version=1.0.0&ty peName=topp:states&propertyName=STATE_NAME,PERSONS&BBOX=-75.102613,40.21 2597,-72.361859,41.512517> or http://localhost:8888/geoserver/wfs <wfs:GetFeature service="WFS" version="1.1.0" xmlns:topp="http://www.openplans.org/topp" xmlns:wfs="http://www.opengis.net/wfs" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.1.0/wfs.xsd"> <wfs:Query typeName="topp:states"> <wfs:PropertyName>topp:STATE_NAME</wfs:PropertyName> <wfs:PropertyName>topp:PERSONS</wfs:PropertyName> <ogc:Filter> <ogc:BBOX> <ogc:PropertyName>the_geom</ogc:PropertyName> <gml:Envelope srsName="http://www.opengis.net/gml/srs/epsg.xml#4326"> <gml:lowerCorner>-75.102613 40.212597</gml:lowerCorner> <gml:upperCorner>-72.361859 41.512517</gml:upperCorner> </gml:Envelope> </ogc:BBOX> </ogc:Filter> </wfs:Query> </wfs:GetFeature> But when I use openlayers, how to request thses requests exactly? For instance, when I request GetFeatureInfo with openlayers. // support GetFeatureInfo map.events.register('click', map, function (e) { document.getElementById('nodelist').innerHTML = "Loading... please wait..."; var url = map.layers[0].getFullRequestString( { REQUEST: "GetFeatureInfo", EXCEPTIONS: "application/vnd.ogc.se_xml", BBOX: map.getExtent().toBBOX(), X: e.xy.x, Y: e.xy.y, INFO_FORMAT: 'text/html', QUERY_LAYERS: map.layers[0].params.LAYERS, FEATURE_COUNT: 50, WIDTH: map.size.w, HEIGHT: map.size.h }, "http://localhost:8888/geoserver/wms" ); OpenLayers.loadURL(url, '', this, setHTML, setHTML); OpenLayers.Event.stop(e); }); } Please, give me a piece of information. Best regards, Myeonghun Jeong.
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