Re: [Gwt-openlayers-users] WFS Layer

[Edwin C. <com...@gm...>]

Hi Christopher,

Great to hear that setting the proxy host worked.

You are free to create Trac tickets for these strategies. As anonymous
user you may create new tickets (you only cannot assign them etc).
Contributions are always welcome. Filling Trac with valid tickets is
also valuable.

The long term goal is to wrap OL completely, so that includes the
strategies :)...

Greetings,
Edwin

On 12 February 2010 16:20, Christopher Navarro <cna...@gm...> wrote:
> 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
>> >
>> >
>> > ------------------------------------------------------------------------------
>> > SOLARIS 10 is the OS for Data Centers - provides features such as
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>> > Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>> > http://p.sf.net/sfu/solaris-dev2dev
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>> >
>> >
>
>