[Chameleon] Filtering (Postgis) layers using user input

[Jos Bol]

Sorry if this mail reaches the list twice, the first mail seems to have bounced. To be sure it arrives, I'm sending it again and also with some changes.

Hi,

I have been playing around with chameleon for some time now and everything seems to work perfectly. Great work!  

My only doubt so far is about postgis layers. I have a postgis layer with several lines, a lot of them actually, and
would only like to display a selection of lines based on user input. I would like to make a dropdown/combobox
with some predefined values and a button. When selecting the value from the combobox and then pressing the
button it should use the selected value of the combox in a heavy* query and display the result (a bunch of lines) on the map. I have been able to get this to work in a normal mapscript application, but don't know how to aproach this, using chameleon.

I´ve read on the mailing list it's possible to manipulate the map in the initializer file. What would be the best way the do this? I assume I have to create a widget for this as well to allow user input. Does anyone have any examples for this or some hints on where to start?  

I already successfully managed to filter a layer based on parameters in the URL and then zoom in to the results of the filter, by messing around in the initializer file. I imagine that there must be a cleaner way to do it, right?

Thanks in advance!

Jos

* The query contains a pathfinding algorithm, so it would be nice if I would only have to execute the query when the user changes the selection
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