[Users] How to create legend panel using OpenLayers.Layer.MapServer layer...
stela anders
stelaanders at gmail.com
Thu Jan 7 13:37:44 CET 2010
Hello Andreas...
All sublayers is with status ON, they are draw on map, but in my legend I
got ONLY "Layer1" label printed...
My layers:
OpenLayers.Layer.WMS("Layer1",
mycgi, {
map: mymapfile,
layers: ['Sublayer11','Sublayer12', 'Sublayer13'],
format: "image/png",
transparent: "true"
}, {
isBaseLayer: true,
visibility: true
}),
OpenLayers.Layer.WMS("Layer2",
mycgi, {
map: mymapfile,
layers: ['Sublayer21','Sublayer22', 'Sublayer23'],
format: "image/png",
transparent: "true"
}, {
isBaseLayer: false,
displayInLayerSwitcher: false,
visibility: true
}),
So, What is your suggestion in building a legend to Map with GeoExt
sublayers? I need all sublayers appears on my legend (each one has different
images...)
Thank you!
Stella
2010/1/6 Andreas Hocevar <ahocevar at opengeo.org>
> On 2010-01-06 18:34, stela anders wrote:
> > Thanks again...
> > I have 3 layers, each one has several sublayers.... :
> > OpenLayers.Layer.WMS("Layer1", ...
> > OpenLayers.Layer.WMS("Layer2",
> > OpenLayers.Layer.WMS("Layer3",
>
>
> GeoExt/OpenLayers does not know about your sublayers in this case.
>
> > But my legend only prints one Label ("Layer1") .... None imagens at
> > all... And just for the first layer...
>
> And do you also just see "Layer1" on your map? If so, then probably all
> your WMS layers are configured as base layers, only one of which can be
> visible at a time. The legend should show all the layers that are
> visible on the map, at least the labels with the layer names.
>
> > Is there anything else to implement ? Maybe in mapfile?
>
> I don't know much about MapServer, but I guess you have to configure
> something in your mapfile so MapServer can return a legend graphic.
> Search the MapServer documentation for GetLegendGraphic, as this is the
> request that GeoExt sends to the server to get the images.
>
> Regards,
> Andreas.
>
>
> >
> > Stella
> >
> >
> >
> > 2010/1/6 Andreas Hocevar <ahocevar at opengeo.org
> > <mailto:ahocevar at opengeo.org>>
> >
> > On 2010-01-06 18:00, stela anders wrote:
> > > Yeah! Thats it Andreas!
> > >
> > > That LegendPanel works with sublayers? I´m a little bit confused
> > right
> > > now!
> >
> > The LegendPanel currently supports one image per layer. GeoServer's
> > GetLegendGraphic e.g. returns images with symbols and text for all
> > rules
> > of the SLD that was used to render the layer. I think the same is
> true
> > for MapServer, but maybe a MapServer user can give more detail about
> > what its GetLegendGraphic returns.
> >
> > Regards,
> > Andreas.
> >
> >
> > >
> > > Thanks !
> > >
> > >
> > >
> > > 2010/1/6 Andreas Hocevar <ahocevar at opengeo.org
> > <mailto:ahocevar at opengeo.org>
> > > <mailto:ahocevar at opengeo.org <mailto:ahocevar at opengeo.org>>>
> > >
> > > Hi,
> > >
> > > make sure that your Ext JS build contains Ext.form.Label, or
> > use a
> > > full
> > > build. The build that most of the GeoExt exmaples use
> > > (http://extjs.cachefly.net/builds/ext-cdn-771.js) does not
> > contain it.
> > > Look e.g. at
> > > http://dev.geoext.org/trunk/geoext/examples/legendpanel.html,
> it
> > > uses a
> > > full build.
> > >
> > > Regards,
> > > Andreas.
> > >
> > > On 2010-01-06 16:24, stela anders wrote:
> > > > Thanks Andreas !!!!
> > > > I changed to WMS with success...
> > > > But now I got that error when trying to generate the legend :
> > > >
> > > > Error: Ext.form.Label is not a constructor
> > > > Arquivo-fonte:
> > > >
> > >
> >
> http://localhost/Openlayer/Arquivos/geoextx/lib/GeoExt/widgets/LegendPanel.js
> > > > Linha: 293
> > > >
> > > > Am I suppossed to change anything?
> > > >
> > > > Thanks
> > > >
> > > > Stella
> > > >
> > > > 2010/1/5 Andreas Hocevar <ahocevar at opengeo.org
> > <mailto:ahocevar at opengeo.org>
> > > <mailto:ahocevar at opengeo.org <mailto:ahocevar at opengeo.org>>
> > > > <mailto:ahocevar at opengeo.org <mailto:ahocevar at opengeo.org>
> > <mailto:ahocevar at opengeo.org <mailto:ahocevar at opengeo.org>>>>
> > > >
> > > > Hi,
> > > >
> > > > On 2010-01-04 19:36, stela anders wrote:
> > > > > Is it possible?
> > > >
> > > > You have at least two choices:
> > > >
> > > > (1) Use Layer.WMS instead of Layer.MapServer. With minor
> > > modifications
> > > > to your mapfile, it is easy to use MapServer as WMS (see
> > > > http://mapserver.org/ogc/wms_server.html). I think this
> is
> > > the best
> > > > option, because it will build the legend automatically
> > from
> > > > GetLegendGraphic requests.
> > > >
> > > > (2) Use a LayerStore with a legendURL field. For each
> > layer, you
> > > > have to
> > > > provide a URL that points to a legend image. This
> > option may
> > > only work
> > > > with the current trunk version of GeoExt, not with v0.6.
> > > >
> > > > Regards,
> > > > Andreas.
> > > >
> > > > >
> > > > > I tried to create that :
> > > > > var legendPanel = new GeoExt.LegendPanel({
> > > > > title: 'Legend',
> > > > > dynamic: true
> > > > > });
> > > > >
> > > > > And added to Viewport, but nothing is created...
> > > > >
> > > > > Help me please!
> > > > >
> > > > >
> > > > >
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> > > > >
> > > >
> > > >
> > > > --
> > > > Andreas Hocevar
> > > > OpenGeo - http://opengeo.org/
> > > > Expert service straight from the developers.
> > > >
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> > >
> > > --
> > > Andreas Hocevar
> > > OpenGeo - http://opengeo.org/
> > > Expert service straight from the developers.
> > >
> > >
> >
> >
> > --
> > Andreas Hocevar
> > OpenGeo - http://opengeo.org/
> > Expert service straight from the developers.
> >
> >
>
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>
>
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