Conditional logic

Five properties in the Logic category control element state. Each takes a true/false expression and re-evaluates automatically when referenced fields change.

Property	While the expression is true…
Visible if	the element is shown (hidden otherwise)
Disable if	the element is visible but inactive
Require if	the element is required
Read only if	the value is visible but locked
Reset if	the moment it becomes true, the value is cleared/reset to default

Visible if

{clientType} == "company"            show for companies only
!isEmpty({email})                    show once email is entered
contains({services}, "delivery")     show when "delivery" was picked

Put visibleIf on a panel to toggle a whole section at once. A hidden element keeps its configuration but is skipped in validation by default.

Disable if

{approvalStatus} == "approved"       lock after approval
{age} < 18                           inactive for minors
!containsAny({roles}, ["admin", "editor"])

Use disable when the user should see that the option exists; use visible when it's irrelevant.

Require if

{personType} == "company"            company code required for companies
{amount} > 10000                     justification required for large sums
{country} != "LT"                    tax ID required for foreign clients

Read only if

{status} == "submitted"              freeze after submission
notEmpty({externalReference})        imported values can't be edited
{__variables.mode} == "view"         whole form in view mode

Reset if

Clears stale answers when their premise disappears:

{personType} != "company"            clear companyCode when switching to person
!contains({supportTypes}, "training")   clear trainingDate if training unselected

Without a reset rule, a hidden field keeps its old value — which would still be submitted.

Complete example

Order form: "Deliver to a different address?" (single checkbox otherAddress) with a delivery panel:

Element	Property	Expression
Panel deliveryPanel	Visible if	{otherAddress} == true
Text deliveryStreet	Require if	{otherAddress} == true
Text deliveryStreet	Reset if	{otherAddress} != true

Result: the section appears only when needed, is mandatory when shown, and cleans up after itself when hidden.