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- if: Tests Conditions
-
- The 'if' tags allows you to test conditions and to take different
- actions depending on the conditions. The 'if' tag mirrors Python's
- 'if/elif/else' condition testing statements.
-
- Syntax
-
- If tag syntax::
-
- <dtml-if ConditionVariable|expr="ConditionExpression">
- [<dtml-elif ConditionVariable|expr="ConditionExpression">]
- ...
- [<dtml-else>]
- </dtml-if>
-
- The 'if' tag is a block tag. The 'if' tag and optional 'elif' tags
- take a condition variable name or a condition expression, but not
- both. If the condition name or expression evaluates to true then
- the 'if' block is executed. True means not zero, an empty string
- or an empty list. If the condition variable is not found then the
- condition is considered false.
-
- If the initial condition is false, each 'elif' condition is tested
- in turn. If any 'elif' condition is true, its block is
- executed. Finally the optional 'else' condition is tested. If it
- is true, the 'else' block is executed. Only one block will be
- executed.
-
- Examples
-
- Testing for a variable::
-
- <dtml-if snake>
- The snake variable is true
- </dtml-if>
-
- Testing for expression conditions::
-
- <dtml-if expr="num > 5">
- num is greater than five
- <dtml-elif expr="num < 5">
- num is less than five
- <dtml-else>
- num must be five
- </dtml-if>
-
- See Also
-
- "Python Tutorial: If Statements":http://www.python.org/doc/current/tut/node6.html#SECTION006100000000000000000
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