[OpenLayers-Users] Marker Disappearing

[John Cole]

Erik,
  I simply copied the resolution list passed to the base layer, as an option
on the marker layer.  I think Christopher was concerned that the marker
layer was not picking up the valid zoom levels from the base layer by
default.  I tend to think that the markers, given no other parameters,
should be visible at all zoom levels valid for the base layers.

  Hope this makes things clearer :-)

John

-----Original Message-----
From: euzuro at gmail.com [mailto:euzuro at gmail.com] On Behalf Of Erik Uzureau
Sent: Monday, July 09, 2007 4:42 PM
To: John Cole
Cc: Christopher Schmidt; Lee Keel; users at openlayers.org;
euzuro at metacarta.com
Subject: Re: [OpenLayers-Users] Marker Disappearing

Hi John,

Can you be more specific about what you did that fixed your problem?

Is this something that we should fix in the code?

Still not quite clear to me.
Erik

On 6/27/07, John Cole <john.cole at uai.com> wrote:
> Christopher,
>   Just wanted to let you know that adding the resolutions to the new
> OpenLayers.Layer.Markers call worked.  Thanks for the help!
>
> John
>
> -----Original Message-----
> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
On
> Behalf Of Christopher Schmidt
> Sent: Wednesday, June 27, 2007 10:26 AM
> To: Lee Keel
> Cc: users at openlayers.org; euzuro at metacarta.com
> Subject: Re: [OpenLayers-Users] Marker Disappearing
>
> On Wed, Jun 27, 2007 at 09:44:59AM -0500, Lee Keel wrote:
> > Hello All,
> >
> >
> >
> > We are experiencing a disappearing marker when the user zooms in after
> > placement of the marker.  You can see this @
> > http://hud.uai.com/hudpls/ViewMap.aspx?FindAddTI=1 then by doing an
> address
> > search.  The marker will remain as long as you are at the current zoom
> level
> > or above, but disappears when you zoom in beyond the initial level.
Here
> is
> > the code I am using to create the marker.
>
> Change this:
>
> >    addressMarkers = new OpenLayers.Layer.Markers("Find Address");
>
> To this:
>
> addressMarkers = new OpenLayers.Layer.Markers("Find Address",
> {'calculateInRange': function() { return true; }});
>
> Alternatively, I think the following should work:
>
> addressMarkers = new OpenLayers.Layer.Markers("Find Address",
> {'numZoomLevels':25});
>
> But I'm not 100% sure.
>
> The problem is that your markers layer is considered 'out of range' for
> some reason -- changing the numZoomLevels should fix that, but
> overrdiding the calculateInRange function to always return true should
> also work.
>
> The source of the problem here is probably related to the 'resolutions'
> setting on your base_wms.
>
> Erik, is this the behavior you expected? I think your'e closest to this
> code -- to reproduce it, simply create a map with an explicit list of
> resolutions which reaches farther in than the default, and then watch
> your markers layer turn off when you zoom in past that point.
>
> Regards,
> --
> Christopher Schmidt
> MetaCarta
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