[OpenLayers-Users] Fwd: Problem with GML features

[Dmitri Mizerkin]

Hello,

the workaround suggested by Tim will do it, because I want to zoom to a
single feature at this time.
Thanks for the help, guys!

Cheers,
Dmitri

2007/7/6, Erik Uzureau <erik.uzureau at metacarta.com>:
>
> 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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