is an option for notebooks that specifies an expression to be dynamically updated whenever that notebook is visible.
Examplesopen allclose all
Basic Examples (1)
Make a notebook that prints a message when it is selected:
Properties & Relations (1)
Dynamic can be omitted from the right-hand side if :> is used:
Similarly, Dynamic can be omitted from the right-hand side if := is used in CurrentValue:
As with any other Dynamic expression, Refresh may be used to control reevaluation: