[OpenLayers-Users] layers limit

[Erik Uzureau]

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
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