[OpenLayers-Users] Fwd: Problem with GML features

[Erik Uzureau]

I would note that the work that I'm doing in my untiled3 branch could
be helpful for this.

The problem is that WFS layer is no longer subclassed off of grid. I
think this is a mistake, but so be it.

At the very least, the work with sending loadStart and loadEnd events
can be a good model.

--erik


On 7/6/07, Tim Schaub <noreply at geocartic.com> wrote:
> Hey Dmitri-
>
> Dmitri Mizerkin wrote:
> > Hi!
> >
> > I haven't got any reaction to my previous mail, so I'm trying to point
> > your attention to my problem again in this follow-up.
> > The problem is: after loading a GML layer the features collection of the
> > layer stays empty (at least for some time), which means that there's no
> > way to handle those in the loadend-event of the layer. Is there another
> > event, which is raised after the features collection of the loaded layer
> > is initialized? Is there any rational workaround?
>
> You're right.  There is no good way to do what you want right now.  I
> assume you're talking about the WFS layer in vector mode (as opposed to
> marker mode).  When the tile for this layer is drawn a WFS request is
> made asynchronously - when this request returns, the GML is parsed and
> added to your layer.  As each feature is added to your layer, the
> optional onFeatureInsert property of your layer (a function) is called.
>   This is not handy if you want to know when the features are done being
> added.
>
> I thought there was a ticket out there already for this.  I'll check -
> and add one if not.
>
> I'm hoping to do some work on the WFS layer in the near future.  This
> and other issues will likely get addressed then.
>
> Tim
>
>
> >
> > Cheers,
> > Dmitri Mizerkin
> >
> > ---------- Forwarded message ----------
> > From: *Dmitri Mizerkin* <eisberg at gmail.com <mailto:eisberg at gmail.com>>
> > Date: 05.07.2007 10:33
> > Subject: Problem with GML features
> > To: users at openlayers.org <mailto:users at openlayers.org>
> >
> > Hello everybody!
> >
> > I'm experiencing problems with handling the features of a GML layer,
> > which is loaded when the page is opened. The problem is that after the
> > 'loanend' event is raised, the features-property of the layer stays
> > empty for some more time, so there is no way to examine the features in
> > this handler. In my case I need to extract the bounds-properties of the
> > features to construct an common bounds-object for zooming (the action
> > should simulate feature selection and zooming to the selection).
> >
> > Any ideas, how this could work?
> >
> > Here's my code snapshot:
> >
> > function SelectFeature() {
> >   var layer = GetLayerByName(FEATURE_LAYER); //returns a MapServer layer
> > to send a request on
> >   if (layer == null)
> >     return;
> >   var selection_url = CreateWFSGetFeatureRequest(layer, FIELD_NAME,
> > FIELD_VALUE); //creates a WFS GetFeature-request
> >   if ((selection != null)&&(selection.map != null)) {
> >     OLMap.removeLayer (selection);
> >     selection = null;
> >   }
> >   selection = new OpenLayers.Layer.GML("Selected Objects", selection_url);
> >   OLMap.addLayer(selection);
> >   selection.displayInLayerChooser = false;
> >   selection.events.register ("loadend", selection, ZoomToSelection);
> >   selection.events.triggerEvent("loadend");
> > }
> >
> > function ZoomToSelection() {
> >   var bounds = ComputeSelectionBounds();
> >   if (bounds == null)
> >     return;
> >   OLMap.zoomToExtent(bounds);
> > }
> >
> > Thanks in advance!
> >
> > --
> > Regards,
> > Dmitri
> >
> > --
> > Gruß,
> > Dmitri
> >
> >
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