Interlude.Condition.IsEmpty
In Depth¶
Condition.IsEmpty(key)
True when the field has no answer: blank text, or nothing selected. Note that false and zero are answers, not emptiness.
The inputs are:
key(string) — The field to read.
Returns condition — The condition.
Search terms: empty, blank, unanswered, null, nothing.
About the Condition nodes¶
Tests over a form's own answers, for use with the Behavior nodes.
Conditions name the field they read by its key — the same key the answer appears under in the results. They are re-evaluated whenever that field changes, so a form's behaviour is described once, declaratively, rather than wired up event by event.
Comparisons are type-aware: numbers compare numerically even when typed as text, lists compare element by element, and text comparison is case-sensitive unless ignoreCase says otherwise.
Example File¶
An example graph ships beside this page: Interlude.Condition.IsEmpty.dyn
The form it builds:
