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- unless: Tests a condition
-
- The 'unless' tag provides a shortcut for testing negative
- conditions. For more complete condition testing use the 'if' tag.
-
- Syntax
-
- 'unless' tag syntax::
-
- <dtml-unless ConditionVariable|expr="ConditionExpression">
- </dtml-unless>
-
- The 'unless' tag is a block tag. If the condition variable or
- expression evaluates to false, then the contained block is
- executed. Like the 'if' tag, variables that are not present are
- considered false.
-
- Examples
-
- Testing a variable::
-
- <dtml-unless testMode>
- <dtml-call dangerousOperation>
- </dtml-unless>
-
- The block will be executed if 'testMode' does not exist, or exists
- but is false.
-
- See Also
-
- "if tag":dtml-if.stx
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