[mapserver-users] ITEMNQUERYMAP problem...

[Richard Greenwood]

On Feb 18, 2008 8:50 AM, Bruno Gendron - Consultant
<bruno_gendron at yahoo.com> wrote:
> Hi all,
>
> We have an Mapserver-Google mashup application with an OpenLayers
> user-interface...
>
> A problem arises when a user does a ITEMNQUERYMAP request on a feature
> that is outside the map extent.
>
> For example:
>
> The first request below works perfectly: the map gets drawn, with the
> "searched" feature highlited in red.
>
> http://www.socioscope.qc.ca/wms/?map=nbcommalim_sr_01.map&layers=all&map_imagetype=png&QLAYER=nbcommalim_sr_01&QITEM=SRIDU&QSTRING=462032800&MODE=ITEMNQUERYMAP&mapext=-8244344+5679271+-8160264+5740420&map_size=840+675
>
> The second request below DOES NOT WORK, because the "searched" feature
> is OUTSIDE the mapextent. The following message then gets returned :
> "msQueryByAttributes(): Search returned no results. No matching
> record(s) found."
>
> http://www.socioscope.qc.ca/wms/?map=nbcommalim_sr_01.map&layers=all&map_imagetype=png&QLAYER=nbcommalim_sr_01&QITEM=SRIDU&QSTRING=462032800&MODE=ITEMNQUERYMAP&mapext=-8193972+5717126+-8161869+5742924&map_size=840+675
>
> WHY? Couldn't Mapserver simply return a map even if the query result is
> empty? Am I missing something?

You could se your extents larger if you actually have data outside of
your extents.

Have you considered tried using
   EMPTY "some_page.html"?
MapServer will display some_page.html when there are no results.

Rich

-- 
Richard Greenwood
richard.greenwood at gmail.com
www.greenwoodmap.com