[las_users] dependency between 2 constraints

["Jerome King" <jejeking@xxxxxxxxxxx>]

Hi all,

I am using the insitu package with a database behind it.
I have a couple constraints defined in the user interface.

For example, users can query data per transect.

Now, there are stations located on those transects.
I was wondering how to go about having a second constraint where users could 
query data per stations but only the stations located on the transect picked 
in the first constraint would appear in the drop down menu.

It would work a little bit like the output menu that is dependant on what 
you choose in the view menu.

I tried replicating the same type of system used between the view and output 
menu to 2 constraints but it did not work.

Another example where a constraint would be dependent on another constraint:
If you have data collected at different stations and the data is collected 
at different depth strata for each stations. Then you want to have a "depth 
strata" constraint that is dependent on the "station" constraint. Depending 
on what station you pick, it would fill the dropdown menu for the depth 
strata constraint with different values.

Is there a way to do this and how?

Thanks a lot!
Jerome.