Hi Hari,
Th ultimate aim is to be able to colour layer symbols on-the-fly. So for
example I may have a layer based on a Shape file for which the symbols are
circles. I need to be able to change the colour of each circle
programmatically. I do not want to use predefined styles for this as there
are potentially any number of colours to choose from. I also do not want to
alter a single SLD file as the colours may be different for each user that
is logged into the application. If I altered the SLD file then every user
would see the same colours.
Any ideas about this? Is this even possible?
I guess you could also create a temporary SLD file, populate appropriately,
assign the layer to this SLD file, then delete the temporary SLD file but I
think there would be performance problems with this and it seems a bit
hacky.
Ideally there should be a way to pass the raw SLD XML directly to geoserver
without needing to save the SLD to a file but I don't think this is
possible. This is how ESRI ArcIMS use to work using it's AXL.
I'll certainly check out the link you provided so thanks for that.
Regards,
Jon-Paul.
On Wed, May 11, 2011 at 12:39 PM, Harikumar Reddy <[email protected]>wrote:
> Hi Jon-Paul,
>
> Can you please explain a bit more about your requirement. i will try to
> think of possibility. Geoserver has been enhanced a lot since version 2.x.
>
> You can check out presentation by Andrea Aime from OpenGeo. It has really
> very useful information regarding SLD.
>
> http://2010.foss4g.org/presentations_show.php?id=3588
>
> Regards,
> Hari.
>
>
> On Wed, May 11, 2011 at 4:15 PM, Jon-Paul Dobson <[email protected]>wrote:
>
>> Hi Harikumar,
>>
>> Thanks for the detailed answer. The problem is that the style I want to
>> use isn't known until run-time, so it would not be possible to use
>> pre-defined styles. I want to for example change a symbols colour based on a
>> database field value which can change over time. This means it wouldn't be
>> be possible to use a fixed SLD file. Do you know if it's possible to do this
>> at all? Is there a way to pass the SLD XML directly to GeoServer without
>> needing to use file?
>>
>> Best regards,
>> Jon-Paul.
>>
>> On Wed, May 11, 2011 at 11:01 AM, Harikumar Reddy
>> <[email protected]>wrote:
>>
>>> Hi,
>>>
>>> I may not provide more insight than given below (provided information
>>> whatever is known to me)., but i hope you will get clarity how to implement
>>> dynamic sld for gis layers for multi lingual webgis applications.
>>>
>>> We can assign more than one styles to a GIS layer (but default SLD will
>>> be selected during geoserver layers configuration..for ex:- polygon for
>>> polygon layers, line for road layers, or point for point features). You may
>>> write need to write code in the program similar to given below.
>>>
>>> Note: even though default SLD is configured in Geoserver, required sld to
>>> be applied should be present in geoserver. naming of such sld like given
>>> below will not confuse developers while coding.
>>>
>>> The slds respective to each layer as follows.
>>>
>>> *layer*
>>>
>>> *sld*
>>>
>>> * *
>>>
>>> *English*
>>>
>>> *Hindi
>>> *
>>>
>>>
>>> gis:gis_sea
>>>
>>> gis_sea
>>>
>>> gis:gis_country
>>>
>>> gis_country
>>>
>>> gis:gis_footprint
>>>
>>> gis_footprint
>>>
>>> gis:gis_buildings
>>>
>>> gis_buildings
>>>
>>>
>>>
>>> gis:gis_city
>>>
>>> gis_city_en
>>>
>>> gis_city_hnd
>>>
>>> gis:gis_district
>>>
>>> gis_district_en
>>>
>>> gis_district_hnd
>>>
>>> gis:gis_towns
>>>
>>> gis_towns_en
>>>
>>> gis_towns_hnd
>>>
>>> gis:gis_roads
>>>
>>> gis_roads_en
>>>
>>> gis_roads_hnd
>>>
>>> if require, pass specific sld's as in order to apply dynamic styles to
>>> the respective layer locale selected.
>>>
>>> Eq 1 :
>>> ....
>>> ....
>>> map = new OpenLayers.Map ("map",options);
>>> var layers ='gis:gis_ind,'+
>>> 'gis_footprint,'+
>>> 'gms_landmarks,'+
>>> 'gis:gis_towns,'+
>>> 'gis:gis_roads,'+
>>> 'gms:gms_point_of_interest';
>>> var slds ='gis_ind,' +
>>> 'gis_footprint,'+
>>> 'gms_landmarks,'+
>>> 'gis_towns_'+ locale +','+
>>> 'gis_roads_'+ locale +','+
>>> 'gms_POI_'+ locale;
>>> var layer = new OpenLayers.Layer.WMS( "ind WMS", wmsUrl,{
>>> layers: layers,
>>> styles: slds,
>>> srs: 'EPSG:4326',format: 'image/png'},{'attribution': '©
>>> 2009 Mapview'},{buffer: 0});
>>> map.addLayer( layer );
>>>
>>> Eq 2 :
>>> ....
>>> ....
>>> map = new OpenLayers.Map ("map",options);
>>> var layer1 = new OpenLayers.Layer.WMS( "Layer1", wmsUrl,{
>>> layers: 'gis:gis_ind',
>>> styles: 'gis_ind',
>>> srs: 'EPSG:4326',format: 'image/png'},{'attribution': '©
>>> 2009 Mapview'},{buffer: 0});
>>> var layer2 = new OpenLayers.Layer.WMS( "Layer2", wmsUrl,{
>>> layers: 'gis:gis_towns',
>>> styles: 'gis_towns_'+ locale,
>>> srs: 'EPSG:4326',format: 'image/png'},{'attribution': '©
>>> 2009 Mapview'},{buffer: 0});
>>> map.addLayers( [layer1, layer2] );
>>> In this example, the locale javascript object gets the respective
>>> language as 'en' or 'ar' and applies language specific style to the layer.
>>>
>>>
>>> @ Hari
>>>
>>>
>>> On Wed, May 11, 2011 at 2:13 PM, Jon-Paul Dobson <[email protected]
>>> > wrote:
>>>
>>>> Hi,
>>>>
>>>> Is there anyway to change layer styles on-the-fly other than to alter
>>>> the .SLD xml file? In our application I want to allow users to have the
>>>> ability to set personal layer styles e.g. colour, symbol etc.Is this
>>>> possible at all?
>>>>
>>>> If the only way to change styles is to alter the .SLD file, then this
>>>> means that layer styles must be set at the global level and personal
>>>> preferences per user would not be possible.
>>>>
>>>> Regards,
>>>> Jon-Paul.
>>>>
>>>>
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>>>>
>>>
>>
>
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