[mapserver-users] query - nquery error w/ point query

[Merrick Lex Berman]

Hi,

Question about use of query / nquery in MS 3.3.  (Note: I installed 3.6 and 
got it to work with PNGs but not Mapplet, so went back to 3.3)

here is the test version:

http://chgis.fas.harvard.edu/webmap/cbos/

if we select the MODE query multi (ie name="mode" value="nquery") and click 
over a CLUSTER of points, it will work fine.

however, if I ZOOM in at all, or try to click over a SINGLE point, it won't 
work at all.  I added a radio button selection for MODE query single (ie 
name="mode" value="query")  but it still doesn't work.  Also played around 
with TOLERANCE, but that didn't have any effect.

Heres the basic info:

TEMPLATE:
     <input type="hidden" name="map" value="[map]">
     <input type="hidden" name="imgext" value="[mapext]">
     <input type="hidden" name="imgxy" value="249.5 199.5">
     <input type="hidden" name="mapext" value="shapes">
     <INPUT NAME="img" TYPE="image" SRC="[img]" width=500 height=400 border=0>

         <input type="radio" name="mode" value="browse" checked> zoom<br>
         <input type="radio" name="mode" value="query"> query single <br>
         <input type="radio" name="mode" value="nquery"> query multi <p>

           <input type=radio name=zoomdir value=1 [zoomdir_1_check]> Zoom 
In<br>
           <input type=radio name=zoomdir value=0 [zoomdir_0_check]> Pan <br>
           <input type=radio name=zoomdir value=-1 [zoomdir_-1_check]> Zoom 
Out<br>
           <input type=text name=zoomsize size=1 value=[zoomsize]> Zoom 
Factor<p>

MAP FILE (queried layer):

LAYER
   NAME location
   TYPE POINT
   STATUS DEFAULT
   DATA ctwn_loc
   TOLERANCE 10
   LABELITEM "UTF_NAME"
   CLASS
     COLOR 255 255 255
     NAME "business"
     SYMBOL symbols/pt_red_8.gif
     SIZE 1
     LABEL
       COLOR 0 0 0
       FONT simsun
       TYPE TRUETYPE
       SIZE 12
       ANGLE AUTO
       BUFFER 2
     END # end of label
   END
   HEADER "loc_hdr.html"
   FOOTER "loc_ftr.html"
     QUERY
       TEMPLATE "loc_fields.html"
     END
END

In short, the nquery will only return results when there are MORE THAN ONE 
points within the TOLERANCE distance, (or if the TOLERANCE = 0 if the point 
SYMBOLS overlap).

I have the feeling that something is not set to capture the mouseclick 
properly?  Can anyone help me to straighten this out?

Thanks!

Lex Berman
China Historical Geographic Information System
http://fas.harvard.edu/~chgis