Non-empty-string doesn't evaluate to true when using on button.Disabled

Question and Answers
1

Hi,

See the screenshot below. I expected the string to evaluate to true.
Is there an easy fix or should I just make a function?

image

Regards,
Dorian

2

@ddorian43 If you are trying to check whether there is any value then evaluate to true you can try {{!!u.book().future_revision_id}}