aenhancers

hi everyone

1)
i was wondering if its possible to control mask pins with expressions.
as far as i know (or as far i was able to figure out) it is not possible. or is it?

2)
we all use expressions and expression controls, like sliders, checkboxes and so on. my question is: does anyone know how to set an error trap when in Layer Control you select None as a layer?

it seems that i cannot even check if a selected layer is set to None, because when I try to do it i get en error message, that "layer is set to None - cannot continue".

any ideas how to check if the layer in Layer Control is selected or not?

thanks in advance

Javascript does support try and catch. I have only used that in jsx, however, not experssions. But it may be worth a try.
http://www.w3schools.com/js/js_try_catch.asp

explorer wrote: 1)
i was wondering if its possible to control mask pins with expressions.
as far as i know (or as far i was able to figure out) it is not possible. or is it?

Not possible. Requires plugins, but both toolsets are no longer available.

explorer wrote: 2)
we all use expressions and expression controls, like sliders, checkboxes and so on. my question is: does anyone know how to set an error trap when in Layer Control you select None as a layer?

You can try Atomic's approach, but it's a bit ineffective. It would be simpler to have a dummy layer that is used as an automated reference when nothing else is selected. Also since expressions throw errors anyways, you r custom code might not show up if it#s overruled by a higher-priority problem.

Mylenium

thanks.
i did not expect try/catch to work, but it did the job nicely.
thanks again.

try and catch works correctly ...
thx Atomic