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I just want to do something like this:
<a href="${ a? 'a.htm' : 'b.htm'}"> 
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string (when used with a boolean value)Converts a boolean to a string. You can use it in two ways: As foo? string("yes", "no") : Formats the boolean value to the first parameter (here: "yes" ) if the boolean is true, and to the second parameter (here: "no" ) if it's false.
If you want to insert the value of an expression into a string, you can use ${...} (and the deprecated #{...} ) in string literals. ${...} in string literals behaves similarly as in text sections (so it goes through the same locale sensitive number and date/time formatting).
The string converted to boolean value. The string must be true or false (case sensitive!), or must be in the format specified by the boolean_format setting. If the string is not in the appropriate format, an error will abort template processing when you try to access this built-in.
eval. This built-in evaluates a string as an FTL expression. For example "1+2"? eval returns the number 3. (To render a template that's stored in a string, use the interpret built-in instead.)
If you're using freemarker 2.3.23 or newer, you can use the then built-in:
<a href="${a?then('a.htm','b.html')}" target="${openTarget}"> If you're using an older version of freemarker, you can use instead the string built-in:
<a href="${a?string('a.htm','b.html')}" target="${openTarget}"> When applied to a boolean, the string built-in will act as a ternary operator.
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