[ka-Map-users] Changing map layer dinamically

[Damiano Morosi]

Yes, I'm trying to do a quite similar thing changing the DATA instead of
FILTER. I'll give a try now, maybe I'm missing the redraw(). Stay tuned!

Pje ha scritto:
> I don't know what you are trying to do. I'm using variable substitution
> here to filter data of a layer based on a parameter sent by the user.
> For example, if i have a layer of airports, the user can choose to view
> only the airports A and B. So, my mapfile looks like:
> 
> map
>     ...
>     layer
>         name "airports"
>         connectiontype POSTGIS
>         connection "xxxxxx"
>         data "geom from foo"
>         ...
>         metadata
>             tile_source "nocache"
>         end
>         filter "name IN (%name%)"
>         ...
>     end
> end
> 
> So, when the user click on a checkbox (airport A) and choose to refresh
> the map I call a function that looks like:
> 
> function refreshMap() {
>     var map = myKaMap.getCurrentMap();
>     var airports = map.getLayer('airports');  
> 
>     airports.replacementVariables = {name: airportName}; //airportName
> contains the name of airport checked by the user
> 
>     airports.redraw();
> }
> 
> Is that you are trying to do?
> 
> On 11/24/06, *Damiano Morosi* <damiano.morosi at atac.roma.it
> <mailto:damiano.morosi at atac.roma.it>> wrote:
> 
>     Your idea is very interesting. I tried to do as you said, putting all
>     the things in my mapfile, i.e., "tile-source" "nocache" in metadata and
>     putting CONNECTION "%conn%" to make a test.
>     After this, in my js:
> 
>     layers = myKaMap.getCurrentMap().getAllLayers();
>     for(var i=0; i < layers.length; i++) {
>             layers[i].replacementVariables = {conn: 'test.ovf'};
>     }
> 
>     It seems logic, but it doesn't work as I try to load the map. This piece
>     of code is called inside the myMapInitialized function: is it right?
> 
>     Thanks,
> 
>     Damiano
> 
>     Pje ha scritto:
>     > You can do that using mapfile variables and setting you layer metadata
>     > to tile_source "nocache". So, when you click on a link, you send the
>     > parameter to your mapfile and refresh your layer.
>     >
>     > To specify values for variable replacement on the client side, add a
>     > replacementVariables object to your JavaScript _layer object (e.g.
>     > myLayer.replacementVariables = {key1: 'value1', key2: 'value2'}).
>     > Variable replacement currently works for layer->data,
>     layer->connection,
>     > layer->filter, and for class->expression.
>     >
>     > You can see how it works here:
>     > http://mapserver.gis.umn.edu/docs/reference/mapfile/variable_sub
>     > < http://mapserver.gis.umn.edu/docs/reference/mapfile/variable_sub>
>     >
>     > On 11/23/06, *Damiano Morosi* <damiano.morosi at atac.roma.it
>     <mailto:damiano.morosi at atac.roma.it>
>     > <mailto: damiano.morosi at atac.roma.it
>     <mailto:damiano.morosi at atac.roma.it>>> wrote:
>     >
>     >     Hi,
>     >
>     >     I would like to change the layer in my kaMap by clicking on a
>     link or
>     >     selecting a voice in a combobox.
>     >     Is there some javascript API to do such thing without too much
>     reverse
>     >     engineering of ka-map?
>     >     Thanks,
>     >
>     >     Damiano
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