Thanks again Joshua for guiding me through this.
"If you're going to be requesting layer images with dynamic styling
then you can't use the cached version of the layer; the cached version
is pre-rendered with whatever styles were set on the layer in
geoserver and/or gwc."
I was afraid of this...that's just too bad :(. I want to cache my layers
and be able to switch the SLD with OpenLayers (I'm truly heartbroken here)
"GWC *can* be set up to cache multiple versions
of a layer based on the values in the STYLES= (or any other) wms
parameter, but that won't work if you are using truly dynamic styles;
for example if you let the user choose arbitrarily style parameters on
the client side and build an SLD from that."
How come? What I mean to ask is that even if the user does pick the SLD and
it is built on the fly, wouldn't that SLD still have to be set-up in the
same format as that read from the file?
"If your SLD really is dynamic you're going to have to use the
non-cached version of the layer. If your GWC and Geoserver layers map
1:1 with each other (which is true for a standard install without a
geowebcache.xml file) then just removing "gwc/service/" from the layer
URL will get you the non-cached version. For example:
gwc url: http://localhost:8080/geoserver/gwc/service/wms
non-cached url: http://localhost:8080/geoserver/wms";
Yes, I was first trying this with my non-cached layers. When you first
helped me with this :), but I had forgotten about my cached layers and as I
was working, realized that it's probably not going to be a possibility :(
Thanks so much for all your help!
Happy Mapping,
elshae
On Fri, Jan 21, 2011 at 3:47 PM, Joshua M. Thompson <
joshua.thomp...@gmail.com> wrote:
> On Fri, Jan 21, 2011 at 12:12 PM, IT Intern <itinter...@gmail.com> wrote:
>
> > I just recently resolved the issue of changing my layers style through
> > OpenLayers using:
> >
> > myLayer.mergeNewParams({sld
> > :'file:///usr/local/geoserver-2.0.2/data_dir/styles/myLayerSLD.sld',
> styles:
> > null});
> >
> > and that works great if I am using WMS layers which are not cached by
> > GeoWebCache.
> >
> > But if my layers are cached, using the above does not work. I have also
> > tried using
> >
> > myLayer.redraw(true);
> >
> > Which is an OpenLayers library method that I believe is called
> automatically
> > with the call to mergeNewParams, so I knew it wouldn't work.
> >
> > So now I am assuming that I have to set-up something in my GeoWebCache to
> > accept dynamic SLD. Any ideas or hints?
>
> If you're going to be requesting layer images with dynamic styling
> then you can't use the cached version of the layer; the cached version
> is pre-rendered with whatever styles were set on the layer in
> geoserver and/or gwc. GWC *can* be set up to cache multiple versions
> of a layer based on the values in the STYLES= (or any other) wms
> parameter, but that won't work if you are using truly dynamic styles;
> for example if you let the user choose arbitrarily style parameters on
> the client side and build an SLD from that.
>
> If your SLD really is dynamic you're going to have to use the
> non-cached version of the layer. If your GWC and Geoserver layers map
> 1:1 with each other (which is true for a standard install without a
> geowebcache.xml file) then just removing "gwc/service/" from the layer
> URL will get you the non-cached version. For example:
>
> gwc url: http://localhost:8080/geoserver/gwc/service/wms
> non-cached url: http://localhost:8080/geoserver/wms
>
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