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javaif-statementfreemarker

If-else statement inside a parameter of a freemarker macro?

Is it possible to have an if/else statement inside a parameter of a freemarker macro?

I now have:

[#if myForm.id==0]
[#assign action = "add"]
[#else]
[#assign action = "change"]
[/#if]
[@printForm action  /]

This is quite a lot of code lines, is it possible to shorten this a bit by putting the if/else construct as a parameter, something like:

[@printForm [if]add[#else]change[/#if]  /]
Solution

  • Update: Starting from FreeMarker 2.3.23, you should use condition?then(whenTrue, whenFalse) for ternary operator. That can have a non-string result and lazy-evaluates its parameters.

    In FreeMarker you can approach this as a boolean formatting task: [@printForm (myForm.id == 0)?string('add', 'change') /]

    Update: Here's a full working example:

    [#ftl]
${.version}

[#macro printForm s]
s: ${s}
[/#macro] 

[#assign myForm = { "id": 0 } ]

[@printForm (myForm.id == 0)?string('add', 'change') /]