[Variable_Defined]
[Variable_Defined] returns True if a variable has been defined in the current page or False otherwise. Can be used to check if a variable has been defined even if the current value of the variable is Null or the empty string.
- Syntax
- Parameters
[Variable_Defined: 'Variable Name']Examples
To check whether a variable has been defined:
Use the [Variable_Defined] tag with the name of a variable. In the following example, True is returned if the variable Favorite_Color is defined.
[Variable_Defined: 'Favorite_Color']Result:
True
To set a variable to a default value if it hasn't been defined:
Use the [Variable_Defined] tag to check whether a variable has been defined or not. If it has not then the variable can be set to a default value. In the following example, the variable Favorite_Color is set to Blue if it has not been defined.
[If: (Variable_Defined: 'Favorite_Color') == False]
[Variable: 'Favorite_Color'='Blue']
[/If]| Tag Link | [Variable_Defined] | Category | Variable |
|---|---|---|---|
| Type | Substitution | Data Source | Any |
| Support | Preferred | Version | 3.0 |
| Output Type | Boolean | Security | None |
| Implementation | LCAPI | Sets | Lasso 7.0, Lasso 6.0, Lasso 5.0,LDML3x |
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