[Mapserver-users] Turning on/off parts of layer based on expr ession

[Jean-Francois.Doyon at CCRS.NRCan.gc.ca]

Steve,

Hmmm inetersting .. this should be doable, though it'll be a bit client
heavy I think ...

I would look at using the MapFile <-> URL settings ... The feature of
MapServer that allows you to alter parameters of the mapfile on the fly
using URL parameters ... (See
http://mapserver.gis.umn.edu/doc36/cgi-reference.html#mapfile )

I would then use this to set the expression of the class you want "off" to
something that couldn't possibly match the underlying data, effectively
making it disappear.

Hope this helps,
J.F.

-----Original Message-----
From: Steve McCrone (maps at work) [mailto:mccrone at pc.jaring.my]
Sent: Thursday, February 20, 2003 8:46 AM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] Turning on/off parts of layer based on
expression


Currently I am turning on/off the layers using check boxes, and I am using
pure cgi mapserver and the rosa applet.
Fine, works well. Now, is it possible to turn on/off parst of the layer
(based on expression value) interactively (like check boxes). The reason
being is that I have one table with say 200 different clasifications and I
want the user to turn on/off a selected classification. I really do not wish
to break up the shape file into 250 different files.

Thanks


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