I would like show an overview of the already answered questions at the beginning of the (restarted) and the end of the survey. The problem is that in the beginning the variables are not yet declared (message: variable declared in a later page) and the survey visitor sees an error message. So how do I check if the variable is declared or not? Is it possible to check for the existence of a variable?
Is there a way to detect if a variable is not declared yet, because that would mean that the question has not been answered yet which is something that I can show in the overview in the beginning of the survey?
Or is there another way to show a list of which questions have been answered and which have not been answered yet?
So is there a way to check whether the variable has been declared already because in my case the question group only has one question so it's still useful to be able to check whether the question has been shown already (even in a previous start of the survey)?