[mapserver-users] Overriding MapServer Map File Parameters inOpenLayers

[Bill Thoen]

Thanks David! You gave me the hint I needed. If I leave out the '+' 
characters and use spaces instead then this works:

            var baseLayer = new OpenLayers.Layer.MapServer( "USA",
               "http://206.168.217.244/cgi-bin/mapserv?",
               {
                  'map_imagetype': 'PNG',
                  layer: 'states',
                  "map.layer[states].class[0].style[0]": "COLOR 255 255 0",
                  map: '/var/www/html/piper/usa.map'
               }, {
                  singleTile: true
               });

However, if you're doing this via URL, you have to substitute '+' for 
spaces.
- Bill Thoen

Fawcett, David wrote:
> Bill, 
>
> Here is something that I have tested in 5.2
>
> http://localhost/cgi-bin/mapserv.exe?map=/ms4w/apps/workshop08/runtime_s
> ub_config.map&mode=map&map.layer[counties].class[0].style[0]=COLOR+178+3
> 4+34+WIDTH+3
>
> It changes both the color and width of the line feature, just drop the
> '+WIDTH+3' off of the end.
>
> Also, I recommend testing your substitution like this directly in the
> URL before attempting to pass it from OpenLayers.
>
> David.
>
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Bill Thoen
> Sent: Friday, January 02, 2009 12:23 PM
> To: mapserver-users at lists.osgeo.org
> Subject: [mapserver-users] Overriding MapServer Map File Parameters
> inOpenLayers
>
>
> I'm trying to make a map in OpenLayers 2.7 using a MapServer 5.0.3 Map 
> File, and I'm trying to change the Layer color from what's specified in 
> the Map File. In OpenLayers, I have to format the parameter as a key: 
> value pair. So here's what I've tried (without success) in my OL
> javascript:
>
> var baseLayer = new OpenLayers.Layer.MapServer( "USA",
>   "http://206.168.217.244/cgi-bin/mapserv?",
>   {
>    map_imagetype: 'PNG',
>    layer: 'states',
>    map_layer_0_class_0_style_0_color: '255+255+000',
>    map: '/var/www/html/piper/usa.map'
>    }, { singleTile: true });
>
> If I take out this line:
> map_layer_0_class_0_style_0_color: '255+255+000'
> the map works fine. The only layer in the map is the US states, and all 
> I want to do is change the color from pale yellow as set in the map file
>
> to bright yellow.
>
> The relevant part of the map file looks like this:
>    LAYER
>       NAME "states"
>       TYPE POLYGON
>       DATA states
>       CLASS
>          NAME "US States"
>          STYLE
>             OUTLINECOLOR 100 100 100
>             COLOR 255 255 192
>          END
>       END
>       PROJECTION
>          "init=epsg:32614" # UTM Zone 14 N WGS84
>       END
>       STATUS DEFAULT
>    END
>
> I think the problem is that I've got the syntax wrong in trying to 
> override the MapServer map file parameter. I've looked at 
> http://mapserver.osgeo.org/cgi/controls.html#changing-map-file-parameter
> s-via-a-form-or-a-url 
> but that hasn't helped. So does anyone *here* know how to do this? (I 
> was told on the OpenLayers mailing list to try asking on the MapServer 
> list.)
>
> TIA,
> - Bill Thoen
>
>
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