[OpenLayers-Users] layers limit

[Christopher Schmidt]

On Mon, Mar 30, 2009 at 11:38:12AM -0700, T. Vieira wrote:
> 
> Hi,
> 
> I have a map with 92 layers.
> I have a layer to move a box. I click on it, and when the wfs response arrives, it shows the box highlighted. The problem is that the DragControl of that box isn't reachable, so i can't move it.
> When i take 7 of 92 layers of the list that initialize the map it works fine. Any of the 85 layers works fine. One more layer and the box is not reachable.
> 
> Any advice?
> 
> 
> 
> > Layers get placed in the z-index hierarchy based on their "type".  There
> > are spaces for 45 (225 / 5) layers between your first "base layer" and
> > your first "overlay".
> 
> What type of layers are you talking when you said that are spaces for 45?
> We only have 1 Baselayer, and the others are Overlayers.
> 
> Am i mistaked?

http://trac.openlayers.org/browser/trunk/openlayers/lib/OpenLayers/Map.js#L27

Override this in a map option.

> Thanks in advance,
> Tiago Vieira
> 
> 
> 
> 
> 
> fwiw it's kind of horrendous that we have these things hardcoded in.
> perhaps we ought consider some sort of dynamic z-indexing plan?
> 
> e
> 
> 
> On 1/30/08, Tim Schaub <tschaub at openplans.org> wrote:
> > Hey-
> >
> > Mick Jagger wrote:
> > > Hi,
> > >       Is there a limit to the number of layers that OpenLayers supports?  I have a page with 63 layers and I get errors with Internet Explorer at layer 60, while Firefox and Opera load the page fine, albeit slowly.  Normally there are only a couple layers, but this is an odd case.
> > >
> >
> > Layers get placed in the z-index hierarchy based on their "type".  There
> > are spaces for 45 (225 / 5) layers between your first "base layer" and
> > your first "overlay".  After this, things start overlapping (base layers
> > over overlays).  Similarly, there is room for 65 "overlay" layers (325 /
> > 5) under any "popup" layers.  Finally, you get 50 "popup" layers before
> > you start overlapping the controls.
> >
> > None of these numbers matches the limit of 60 that you are asking about,
> > but the idea is that browsers start to break down before either of these
> > thresholds is met.
> >
> > There is likely a better way to do things than adding 60ish layers to
> > your map at a time.
> >
> > Tim
> > _______________________________________________
> > Users mailing list
> > Users at openlayers.org
> > http://openlayers.org/mailman/listinfo/users
> >
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> 
> 
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-- 
Christopher Schmidt
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