[OpenLayers-Users] GetFeature info from a MapServer WMS

[percy]

here's an example from your openlayers download, modify your version to 
point to your server, etc
http://openlayers.org/dev/examples/getfeatureinfo.html

there's a nice "cookbook" for serving WMS data on the OneGeology website:
http://www.onegeology.org/misc/downloads.html

and here's a relevant section from one of my mapfiles below. It should 
work just fine with a postgis connection instead of shapefile, as I am using
HTH,
Percy

------------mapfile stuff-------------
LAYER
		NAME "Geologic_Map_Of_North_America"
		TYPE polygon
		STATUS On
     data GMNA_South_Union_wgs84
     TOLERANCE 0
     TOLERANCEUNITS pixels
     TRANSFORM TRUE
     DUMP TRUE

     HEADER "templates/GMNA_query_header.html"
     TEMPLATE "templates/GMNA_query_body.html"
     FOOTER "templates/GMNA_query_footer.html"

Metadata
"WMS_TITLE" "Geologic Map Of North America"
"WMS_SRS" "epsg:4326"
      GML_INCLUDE_ITEMS 
"DisplayNam,OneGeology,Lithologic,GeologicAg,AgeMin,AgeMax,AgeMetadat"
      WMS_INCLUDE_ITEMS 
"DisplayNam,OneGeology,Lithologic,GeologicAg,AgeMin,AgeMax,AgeMetadat"

END # metadata
END #layer
-------------------end of mapfile stuff-----------

Yves Moisan wrote:
> Hi All,
> 
> Audience of this message : users of MapServer (WMS).
> 
> I'm trying to find examples of how to retrieve attributes from a postgis
> table served via MapServer WMS.  I have my points in OL, now I want and
> "info" on them.  I understand I have to enable the layer to be queryable
> in my mapfile.  So I googled and found a top level directive (QUERY \n
> STATUS ON), but that was found to be an offending command.  I also found
> a bunch of other directives, so my mapfile now looks like this : 
> 
>  METADATA
>    # OGC:WMS specific tags
>    "ows_title"    "Resettlement Sites"  
>    "ows_abstract"    "RAP Resettlement Sites"
>    "ows_keywordlist"    "Resettlement, TFM" 
>    "ows_srs" "EPSG:32735"
>    "wms_opaque"    "0"
>    "wms_group_title" "Data"
>    "wms_group_abstract"  Data"
>    "wms_dataurl_href" "http://someserver:8081/data/"
>    "wms_dataurl_format" "text/html"
>    "ows_metadataurl_type" "FGDC"
>    "ows_metadataurl_href"
> "http://someserver:8081/ms_ogc_workshop/index.html"
>    "ows_metadataurl_format" "text/html"
>    "ows_extent" "389443 8816705 442791 8858984"
> 
>    # OGC:WFS specific tags
> 
> # /WFS_Capabilities/FeatureTypeList/FeatureType[*]/MetadataURL/@format
>    "wfs_metadataurl_format" "TXT"
>    # specify which fields to include when returning queries
>    "gml_include_items" "all" 
> 
> The mapfile top level projection is set to 900913 and that gets
> translated fine overtop of a Google base layer.  
> 
> On the OL side, I found some InfoButton code which I think I have
> adapted correctly for my layer.  I don't see anything when I click on my
> map.  I'm obviously missing something and I won't go into the details,
> but rather I will just ask for pointers to example MapServer served WMS
> layers that are queryable through OL (that is, one clicks and some div
> gets populated with attribute content or better some popup appears)
> showing all settings.  I am a bit flabergasted by the number of moving
> parts.  
> 
> Just for the sake of it, I extracted my data and turned it into a
> textfile which I then used in OpenLayers.Layer.Text (as per
> http://wiki.openstreetmap.org/index.php/Openlayers_POI_layer_example).
> OOTB, one gets a nice popup, default icon and default html formatting.
> I wonder if one could get as easy a popup solution for a WMS served
> queryable layer ?  I wouldn't be so crazy as to generate a textfile on
> the fly to duplicate my layer so that it becomes easily queryable ...
> 
> Thanx for pointers,
> 
> Yves Moisan
> 
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
> 

-- 
David Percy
Geospatial Data Manager
Geology Department
Portland State University
http://gisgeek.pdx.edu
503-725-3373