[Mapserver-users] Problem setting up direct URLs when using MapScript

[AMC Story]

Hi Lowell,

The source of the map image is: src="/tmp/map.png"

Is the problem then, that I need a unique id for each map created?

Thanks,
Ali

Quoting Lowell Filak <lfilak at medinaco.org>:

> What does the "<img src=..." part of the returned page look like?
> Lowell
> 
> The following message was sent by AMC Story <s9646183 at sms.ed.ac.uk> on
> Tue, 22 Jul 2003 15:03:48 +0100 (BST).
> 
> > Hi there,
> > 
> > My problem is that I've set up a user interface to my application
> using perl 
> > MapScript.  The script utilises a form that passes back variables
> such
> as the 
> > current map extents, previous map extents, mouse click locations,
> modes (ie. 
> > pan north, zoomin, previous extent etc), active layers and so on.  I
> then use 
> > MapScript to manipulate these variables, set the new extents and
> active layers 
> > accordingly and then redraw the map.  
> > 
> > So, the user is first presented with a screen that lists all the
> features of 
> > interest (i.e. all the point objects in my shapefile).  The user can
> then click 
> > on the url of each feature to go to the map interface page and see a
> map that 
> > is zoomed in to that point.  The user can also click on an image on
> the opening 
> > page which submits a form with the hidden variable "mode" set to
> "full_extent", 
> > so that they see the whole world map with all the features displayed.
> > 
> > The problem is, that when you click on the url (which looks like
> this...
> > <a
> href="http://file_path/script?lon=123.64&lat=-0.51&mode=each_feature">)
> the 
> > variables are passed and the script runs.  The script then works out
> the extent 
> > of the new map based on these variables and a new map should be
> created with 
> > this extent (ie the extents for $current_map are set to their zoomed
> in values, 
> > and then the $current_map->draw method draws the map).  However, to
> see the 
> > zoomed in map, you have to manually refresh the browser, or put in a
> line to 
> > the script which does this automatically for you.  Otherwise, the map
> is drawn 
> > as if the extent values haven't actually been changed from those in
> the map 
> > file.  Can anyone see why this might be the case?  I've printed out
> the extents 
> > of the map object just before it gets drawn, and they definately have
> been 
> > updated, but the map object that is drawn doesn't seem to reflect
> this..??
> > 
> > Sorry if this is a really long-winded e-mail ;)
> > 
> > Many thanks for any thoughts,
> > Ali
> > _______________________________________________
> > Mapserver-users mailing list
> > Mapserver-users at lists.gis.umn.edu
> > http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> 
>