| Tag Link | [Null] | Category | Tags |
|---|---|---|---|
| Type | Substitution | Source Available | No |
| Support | Preferred | Version | 5.0 |
| Change | Unchanged | Data Source | Any |
| Output Type | Null | Security | None |
| Implementation | LCAPI | Sets | Lasso 8.5, Lasso 8.0, Lasso 7.0, Lasso 6.0, Lasso 5.0 |
[Null] creates a null value.
The null value is the default value for newly created variables which are not defined and is returned from many tags as a default value.
The [Null] tag is most often used in comparisons to check whether a given value is empty.
[Null]
[If: (Variable: 'VariableName') == (Null)]
...
[/If]
No Parameters Required.
To check whether an [Action_Param] is empty:
Compare it against the value of the [Null] tag. The following example displays a message if the [Action_Param] named Username is empty.
[If: (Action_Param: 'Username') == Null]
No username was specified.
[/If]
No username was specified.