Conditionals

DCL supports a simple if-elseif-else-endif conditional for testing whether one string equals another.

Conditional functions follow normal function syntax and always return an empty string. They cannot be used as arguments to other functions. You can test for equality or inequality. There is no concept of boolean operators, but you can simulate AND by nesting conditionals.

Check if "foo" is equal to "foo" (true):

<% if compare="foo" equal="foo" %>

Check if "foo" is equal to "bar" (false):

<% if compare="foo" equal="bar" %>

Check if "foo" is not equal to "foo" (false):

<% if compare="foo" notequal="foo" %>

Check if "foo" is not equal to "bar" (true):

<% if compare="foo" notequal="bar" %>

Full example of a conditional block:

<% if compare=<% contact field="firstname" %> equal="Bart" %>
    You're Homer's son! 
<% elseif compare=<% contact field="firstname" %> equal="Lisa" %> 
    You're Homer's elder daughter! 
<% elseif compare=<% contact field="firstname" %> equal="Maggie" %>
    You're Homer's younger daughter! 
<% else %> 
    Doh! 
<% endif %>

Below we use the boolean or in an expression. To use an and, just replace or with and. Internally, the if function checks its and or or argument for true.

<% if compare=<% contact field="firstname" %> equal="Bart" or=<% if compare=<% contact field="firstname" %> equal="Lisa" %> %> 
    You're Homer's child
<% endif %>