<#if condition> ... <#elseif condition2> ... <#elseif condition3> ... ... <#else> ... </#if>
- condition, condition2, ...etc.: Expression evaluates to a boolean value.
You can use if, elseif and else directives to conditionally skip a section of the template. The condition-s must evaluate to a boolean value, or else an error will abort template processing. The elseif-s and else-s must occur inside if (that is, between the if start-tag and end-tag). The if can contain any number of elseif-s (including 0) and at the end optionally one else. Examples:
if with 0 elseif and no else:
if with 0 elseif and else:
if with 2 elseif and no else:
if with 3 elseif and else:
To see more about boolean expressions, see: Template Author's Guide/The Template/Expressions.
You can nest if directives (of course):
When you want to test if x > 0 or x >= 0, writing <#if x > 0> and <#if x >= 0> is WRONG, as the first > will close the #if tag. To work that around, write <#if x gt 0> or <#if gte 0>. Also note that if the comparison occurs inside parentheses, you will have no such problem, like <#if foo.bar(x > 0)> works as expected.