[OpenLayers-Users] Marker Disappearing

[Christopher Schmidt]

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