[Chameleon] Querying dynamic built layers

[Ken Sanderson]

Thanks Eric for the reply.

I am not sure I understand the issue with chameleon. I added the layer 
to the session map object so that it would remain between map draws, 
basically for the life of the session. How would this conflict with the 
query attempt?

Basically I have done the equiv of the perl script you have linked, only 
I did it with PHP mapscript, now possible thanks to them making index a 
write-able property for php mapscript.

So I have a layer loaded to the map, I have points being displayed, with 
  appropriate labels, I just cant use the query widget on that layer, or 
rather it always returns 0 records.

Ken

Eric Bridger wrote:
> There is a work around that I have used for this type of thing using
> mapscript (Perl). I call $point->draw() and then create a single point
> line shape from that point (setting the $shape->index to my numeric key
> value and call $layer-addFeature($shape).  This adds the point as a
> feature to the layer and it is queryable and should return the index you
> used. There is a Perl example of this here:
> http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?PerlMapScriptExamples42ex1
> 
> 
> BUT there is a problem with this approach when using Chameleon.  In
> Chameleon the map object is cached in your session and I've found that
> all features added to the map are retained between map draws.
> 
> You might be able to get around this by calling $map->removeLayer() but
> I have not tested this.
> 
> 
> On Wed, 2005-03-16 at 13:05, Ken Sanderson wrote:
> 
>>Hello all.
>>
>>I have setup a script that queries a database and retrieves a bunch of 
>>points. I then create a layer object that I added to the map object for 
>>these points. Each of these points shows up on the map, each has a 
>>label, and I have used the new change to the index property to add an 
>>index value for each point, sequentially. All works, no errors.
>>
>>I 'thought' that I could just add the template value and then this layer 
>>would be queryable using the query tool. Obviously it will not return 
>>any data other than the shape_index and other inherient values, but for 
>>now thats all I wanted to check.
>>
>>However this is not the case. The query returns the layer in the list of 
>>  layers that didnt return results, but never returns any values.
>>
>>Any ideas why this is?
>>
> 
> 
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