[ka-Map-users] control class visibility

[Paul Spencer]

Donal,

it is theoretically possible since this is supported in mapscript,  
but it is not currently supported in ka-Map.  To achieve your desired  
effect, you would need a layer for each class.  In fact, in the  
current set up, you would need a group for each layer as well, since  
visibility is controlled at the group level.

There is an alternative which is to use uncached tiles.  Tim Schaub  
added the capability to to use uncached tiles and to pass variables  
to the tile script which would then be inserted into the map file.   
It is possible that you could use this to control visibility of your  
classes by dynamically modifying the sql of your postgis layer  
source.  This is documented in the kaMap wiki (http://ka- 
map.ominiverdi.org/wiki/index.php/Setting_metadata_in_the_mapfile)

Finally you could write your own tile.php script to replace the  
existing one.

Cheers

Paul

On 7-Jun-06, at 7:28 AM, Donal Regan wrote:

> Hi,
>
> Is it possible to turn individual classes within a layer on  and  
> off, or do I have to create a separate layer for each class in  
> order to control its visibility?
> What I'd like to do is query postgis which will return a layer with  
> about 10 classes and then use checkboxes on the client to toggle  
> the classes on and off.
>
> Cheers,
>
> D.
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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