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https://issues.apache.org/jira/browse/VELOCITY-756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850724#action_12850724
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Nathan Bubna commented on VELOCITY-756:
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As an alternate to #if #else, there is also:
http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/DisplayTool.html
which provides $display.alt($foo) and $display.alt($foo, 'n/a') and many other
such display control methods. This is ideally where "extra" features like this
go. The tool approach has several advantages:
- keeps VTL syntax simple and contained (feature creep has its costs)
- provides API that is easy to extend and enhance
- typically provides much more clear and user-friendly API
Unless the $?foo syntax were to become something frequently requested (which it
has never been), i don't see us working to adopt it anytime soon, for the
reason of keeping things simple.
> New notation for replacing null values with a specified string
> --------------------------------------------------------------
>
> Key: VELOCITY-756
> URL: https://issues.apache.org/jira/browse/VELOCITY-756
> Project: Velocity
> Issue Type: New Feature
> Components: Engine
> Reporter: Ludwig Magnusson
> Priority: Minor
>
> If I have a variable $foo and it is null, I have the option of using the
> silent notation $!foo for not writing it. But often when genrating HTML pages
> I want to express that the values is missing, e.g. by a "-". That means that
> I have to write my code like this:
> #if($foo)
> $foo
> #else
> -
> #end
> Wouldn't it be great if there were a new option like $?foo (or whatever
> chararter would be suitable instead of "?") that would print the variable
> $foo if it was not null and otherwise print a predefined character like "-".
> /Ludwig
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