Yep, that'll I do. I was just wondering whether there would be a clever way to do this, but I guess, because I haven't got any features rendered and actually extractAttributes is set to false, it's better to stick to that GetFeature method. Actually my present need is to fetch a single only geometry and to use its bounding box.
Yeah, I believe also so that GeoServer's CQL-filter allows to just state attr1=what_you_want, of course in proper syntax. thanks, - mika - Alexandre Dube kirjoitti: > Well I guess your CQL_FILTER approach looks ok, so you could just > change it to request a specific feature that has a specific attribute > value. > > I never used GeoServer but I think the following links could help you > find what you need : > > http://geoserver.org/display/GEOSDOC/WMS+vendor+parameters > http://geoserver.org/display/GEOSDOC/WFS+vendor+parameters > > And about my solution, I guess it was good for my example of "city > search" because I need all of them, but in your case you only need > what's requested by the user, so it's not really useful to fetch them > all at first. > > Best regards, > > Alexandre > > Lehtonen, Mika wrote: >> Alexandre Dube kirjoitti: >>>> >>>> >>>> I have my data in PostGIS and I mean features that aren't shown in >>>> my map. Or actually they are shown, but through wms. I am already >>>> fetching some attributes after geometry comparison through wfs >>>> GetFeature, but I was wondering whether there would some other ways >>>> to do that. >>> >>> Could you share an example of this ? I would like to see how you do >>> it. >>> >>> Alexandre >> Sure, >> it ain't no rocket science. I'm using GeoServer and PostGIS. I have >> about 3000 polygons in my wfs service and I need to get some >> attributes out of those I choose using wms-layer as a reference. The >> choosing tool is sort of a buffer tool (choose all features which are >> entirely or partially inside the circle). First I do the GetFeature.( >> I'll try to incorporate only the essential parts..) >> >> function buffer(e) { var url = >> wfs.getFullRequestString({ >> SERVICE: 'WFS', >> VERSION: '1.0.0', >> REQUEST: 'GetFeature', >> OUTPUTFORMAT: 'json', >> PROPERTYNAME: 'the_geom,attr1', >> MAXFEATURES: 1000, >> TYPENAME: 'ns:layername', >> SRSNAME: 'EPSG:900913', >> CQL_FILTER: 'INTERSECT(the_geom,'+ buffergeometry +')' >> }, >> "http://host.domain/geoserver/wfs"; >> ); >> OpenLayers.loadURL(url,'',this,bufferUpdate); >> Event.stop(e); >> }; >> >> Then I dig the attributes I need out of the response: >> >> function bufferUpdate (response) { >> g = new OpenLayers.Format.JSON(); >> resp = g.read(response.responseText); >> attrdata = new Array(); >> for (i in resp.features) { >> attrdata[i] = resp.features[i].properties.attr1; } >> } >> >> I hope I included all the parts needed. Anyway after this I have an >> array of attributes (attr1) of the chosen geometries. I guess >> CQL_FILTER is Geoserver specific and JSON isn't mandatory format in >> wfs compliant server, but of course there could be used standard >> FILTER and GML output with 'getElementsByTagName' or similar. >> >> - mika - > > _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
