I have a very simple questionnaire published online using IWP. Its kind of lengthy at 5 pages but its broken up into these pages to hopefully capture data even if someone goes past the 60 minutes for a Session timeout.

At the end of page one I need to require that a field not be empty before the participant can continue. If I use the internal 'not empty' validation the dialog that pops up is not useful since it only show the name of the field and not the full question. A custom dialog script step is not supported by IWP

Any other way to do this like maybe highlight the question?

Any suggestion are appreciated.

Have a field on your page that is calculation

case(isempty(field),"This field must be completed",)

in your script which takes you to the next page have an if statement which exits script if the calculation field="This filed must be completed"

or something similar

You could leave the field a text field and in script again use an if statement

if isempty(field)

set field "This field must be completed"

exit

endif