[ka-Map-users] Changing map layer dinamically

[Pje]

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> 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>> 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
> >     _______________________________________________
> >     ka-Map-users mailing list
> >     ka-Map-users at lists.maptools.org <mailto:
> ka-Map-users at lists.maptools.org>
> >     http://lists.maptools.org/mailman/listinfo/ka-map-users
> >
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > ka-Map-users mailing list
> > ka-Map-users at lists.maptools.org
> > http://lists.maptools.org/mailman/listinfo/ka-map-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.maptools.org/pipermail/ka-map-users/attachments/20061124/d92539f5/attachment.html