How to get state of checkbox?

Question

Please explain how to get state of checkbox for its usage in further calculations. And I want to keep the selection from session to session without external savings. Thanks in advance

Answer 1

You can use DynamicModule.

"Symbols specified in a DynamicModule will by default have their values maintained even across Mathematica sessions." (ref. DynamicModule)

DynamicModule[{x},
 If[ValueQ[reportx], x = reportx, reportx = x = False];
 Checkbox[Dynamic[x, (reportx = x = #) &]], 
 Initialization :> (reportx = x)]

The default value of x/reportx is set to False.

It should only be necessary to evaluate the module once; re-evaluation does not reset anything though.

Note that you will need to keep the checkbox output cell in the notebook since the output is where the dynamic value is held. If you delete the output cell and save the notebook the value of x is gone.

There is an interesting Mathgroup post from John Fultz about that here.