Re: [Gwt-openlayers-users] WFS Layer

[Christopher N. <cna...@gm...>]

Thanks for your quick reply Edwin.  I successfully set the proxy host using
the JSNI code you provided and loaded my WFS layer.  I will look at what is
in trunk because I would prefer to use the WFS protocol.

I don't see any of the OpenLayers Strategies such as Cluster, BBOX, etc, is
support planned in the near term for these options?  I didn't see it among
the tickets in Trac.

Regards,
Chris

On Thu, Feb 11, 2010 at 4:36 PM, Edwin Commandeur <
com...@gm...> wrote:

> Hi Christopher,
>
> Without a proxy it is not possible for OpenLayers to do WFS requests,
> because of cross-domain restrictions on Javascript.
>
> Before going into ProxyHost: The recommended way to create a WFS layer
> is via WFSProtocol. We are intending to remove the WFS layer
> alltogether, as it appears to be the legacy way to talk to a WFS. You
> can look at the latest OpenLayers examples
> (http://openlayers.org/dev/examples/). For instance:
>
> http://openlayers.org/dev/examples/wfs-states.js
>
> For this you need the code that it is in trunk (but see also below about
> proxy).
>
> The easiest way to set the proxyHost is to create a setter for it in JSNI
> code:
>
> public static native void setProxyHost(String host)/*-{
>
>  $wnd.OpenLayers.ProxyHost = host;
>
> }-*/;
>
> and then
>
> setProxyHost("myhost/here");
>
> However, the proxyHost should point at a proxy that is running on the
> same domain as the javascript. There is a python proxy included with
> the OpenLayers examples. You can try to get that running at the some
> domain as the app you are working on.
>
> Currently, the GWT-OL lacks a java proxy servlet, but that should be
> added to trunk soon. I can send you a copy of the new build when that
> hits trunk.
>
> Greetings,
> Edwin
>
> On 11 February 2010 17:55, Christopher Navarro <cna...@gm...>
> wrote:
> > Hi,
> >
> > I'm trying to read WFS features from a geoserver using gwt-openlayers and
> I
> > can't seem to figure out where I am going wrong.
> >
> > Using straight OpenLayers/Javascript/HTML I have the following, which
> works:
> >
> > // Proxy setup to fix XMLHttpRequest domain matching
> > OpenLayers.ProxyHost = "/cgi-bin/proxy.cgi?url=";
> >
> > // parameters for getting the WFS layer
> > var params = { typename: "marketmaker:business_cu" };
> > var options = {};
> >
> > // WFS Layer creation
> > var layer = new OpenLayers.Layer.WFS( "WFS",
> >           "http://mmweb.ncsa.uiuc.edu:8080/geoserver/wfs",
> >           params, options );
> >
> > // add the layer
> > map.addLayer( layer );
> >
> > My GWT-OpenLayers equivalent is:
> >
> > // parameters for wfs layer
> > WFSParams wfsParams = new WFSParams();
> > wfsParams.getJSObject().setProperty( "typename",
> "marketmaker:business_cu"
> > );
> >
> > // no additional options
> > WFSOptions wfsOptions = new WFSOptions();
> >
> > // WFS layer creation
> > WFS wfsLayer = new WFS( "wfs", WFS_URL, wfsParams, wfsOptions );
> >
> > // add the layer
> > map.addLayer( wfsLayer );
> >
> > Is there some way to inject the value of OpenLayers.ProxyHost using
> > GWT-OpenLayers?  I'm not sure if that is the issue.  I am new to
> javascript
> > and perhaps this is wrong, but I tried writing the value of
> > OpenLayers.ProxyHost directly into the compiled javascript file that GWT
> > creates.  Any help is appreciated.
> >
> > Regards,
> > Chris
> >
> >
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