Use the Conditions tab to enter or revise a when condition
rule that can be expressed as a single Boolean expression or the conjunction (AND or OR) of
one or more Boolean expressions.
Each node on the conditions tree defines a single comparison or other condition that
evaluates to True or False. The when condition rule
evaluates to True only if all nodes evaluate to True. While
the order of nodes can affect computational performance, order does not affect the outcome of
the when condition rule evaluation.
The top node is labeled When. To create the first expression,
complete the following steps:
-
Double-click the link below the When node.
-
Enter properties, literal constants, or function calls and parameters in the fields,
and select a relational operator.
For some comparisons, the Select values link is displayed.
Click it to select one or more property values against which to compare the property. The
list displays the values that have been entered for the property in a case.
- Optional:
Select the down arrow at the end of the row for a list of standard conditions (derived
from function alias rules).
If you select
[expression evaluates to true], use the
Expression Builder for guided assistance; click the
Open expression
builder icon to open it. For more information, see
About Expressions.
-
To close the dialog box and display the condition on the tree, click
OK.
To add, edit, or delete conditions, or to create groups of nested conditions, select a
node and open the context menu by either by clicking Actions to
the right of the node.
Each node has the following options:
-
Edit — Update the condition.
-
Insert Condition — Add a condition below the selected node.
When you close the dialog box, an AND or OR logical operator is displayed to the left
of the new node. You can switch between them by clicking the operator. Changing one
operator changes all operators at the same level.
-
Insert Group — Create a group of nested conditions. To help
identify the group on the tree, enter a name in the Group Label field. When you close the dialog box, the condition is indented below the
node above it. To display or hide the nodes within the group, ue the
Expand and Collapse icons. When a node
is collapsed, only the label is displayed. To edit the label, select it on the tree
and choose the Edit menu option. You can nest groups at
multiple levels; for example:
A AND B AND (C OR (E AND F)).
-
Delete — Delete the expression node. Node groups nested beneath
it are also deleted.
The conditions and logical operators that you enter on this tab are displayed on the
Advanced tab's Condition array and Logic
String field.