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A Show_If column constraint may be used to show or hide a column value according to a condition.
Show_If is commonly used to:
Hide columns that aren't intended for forms.
Show only non-zero values in a column of numeric values.
Hide sensitive values, such as email addresses, from most users while showing them to administrators.
Show action buttons in only select views.
The Show_If Expression
The Show_If column constraint is a Yes/No expression: if the expression evaluates as TRUE, the column value will be shown; if FALSE, the column value will be hidden.
As in all column constraint expressions, the Show_If expression may refer to the current column value using the column value expression,
[_THIS]. For instance, if the current column is Employee Name,
[Employee Name] and
[_THIS] both refer to the same value.
Scope of Show_If
The Show_If column constraint is applied any time the column itself is displayed. The column constraint is not applied to the column value when used in an expression.
Show_If conditions can enabled for only form views or for the entire app. To control this behavior, see the Apply show-if constraints universally setting under UX > Options.