[maplab-users] BUG? layers don't show when opt_flag=0

[Paul Spencer]

Steven,

there are some issues with layer visibility and the legends.  There are 
some technical limitations to how well layer visibility can be tracked 
without using sessions.  There is a definite issue with scale of 
visibility.  When layers are turned on because the user zooms in/out, 
the layer name is not in the legend from the previous zoom and is 
assumed to be off.  This is because the HTML checkboxes only pass the 
values that are turned on.  It is not possible to tell (without a more 
sophisticated mechanism than is in gmapfactory) whether the change in 
state was a user choice or a map event (such as coming into scale).

I'm not sure if we are to be able to address this within the scope of 
gmapfactory or not.  If you can determine a better algorithm for 
handling it, we'd be happy to put it in place, though.

Cheers,

Paul

woodbri@swoodbridge.com wrote:
> OK, I have run into some strangeness with the legend template. I 
> changed the value of [leg_layer_html Opt_Flag=0] from 15 so that it 
> does not display tons of legend items that are not showing on the 
> map, but now all my annotation layers do not toggle on when I zoom 
> in. What's with that?
> 
> In fact, have a copyright notice on the image that shows up when you 
> launch the gmapFactory application, but vanishes as soon as you zoom 
> and other annotation that should turn on as you zoom in does not.
> 
> BUT, it I set the Opt_Flag=15 then it works but I get lots of 
> unwanted layers showing in the legend.
> 
> Any ideas? Did I miss something?
> 
> Here is the app with Opt_Flag=0:
>    http://imaptools.com/vmap0/
> 
> Here is the app with Opt_Flag=15:
>    http://imaptools.com/vmap0a/
> 
> There is not other differences.
> 
> Thanks,
>   -Steve
> 
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-- 
Paul Spencer
Applications and Software Development
DM Solutions Group