Interlude.Rule.CompareTo
In Depth¶
Rule.CompareTo(otherKey, operation: "GreaterThan", message: "")
The field's answer must compare correctly against another field, for rules such as "end date must be after start date".
The inputs are:
otherKey(string) — The field to compare against.operation(string, defaults to"GreaterThan") — Equals, NotEquals, GreaterThan, GreaterThanOrEqual, LessThan or LessThanOrEqual.message(string, defaults to"") — Wording shown when the comparison fails.
Returns rule — The rule.
Search terms: compare, other field, after, before, greater, cross field.
About the Rule nodes¶
Checks applied to a field's answer, for use with Behavior.WithValidation.
Rules run as the user types and block submission while any of them fails. A rule on a field the user cannot see is never applied — a hidden field can never stop a form being submitted, which would otherwise mean an error with no control to fix it.
Except for Rule.Required, every rule passes on an empty field. Emptiness is Behavior.Required's business, so an optional field with a range on it stays optional.
Example File¶
An example graph ships beside this page: Interlude.Rule.CompareTo.dyn
The form it builds:
