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Global Constant Resource
Fixed, system-provided values.
Required Editions
| View supported editions. |
| Global Constant | Supported Data Type |
|---|---|
| True |
Boolean
|
| False |
Boolean
|
| Blank Value (Empty String) |
Text
|
Example
When you create a Boolean variable, the supported values are True and False.
Null Versus Empty String
At run time, Blank Value (Empty String) and null
are treated as separate, distinct values.
- Blank Value (Empty String) indicates a text value with zero characters. It’s used to determine whether a field or variable is blank.
nullindicates that a value doesn’t exist. It’s used to determine whether a field or variable value is available.- To check if a field or variable has been populated with data Equals for the operator, and Blank Value (Empty String) for the value.
- To check if a field or variable value isn’t available, in a condition, use Is Null for the operator and True for the value.
Example To check if a Get Records element found records, add a Decision element with manually
set conditions. Then use the Get Records record collection for the first decision outcome’s
resource, Is Null for the operator, and False
for the value.
Considerations
- If you don’t give a text field or variable a starting value, the value is
nullat run time. If you want the value to be treated as an empty string, set it to Blank Value (Empty String). - For a text field or component placed on a Screen element, the Is Null operator always evaluates to false. To determine if the field or component has no value, use Equals for the operator and Blank Value (Empty String) for the value.
- If a condition compares two text variables, make sure that their default values are
either set to Blank Value (Empty String) or left empty
(
null). - To check for both a
nullor Blank Value (Empty String) value at the same time, use the ISBLANK formula function.
See Also
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