How I hide empty Velocity variable names?

Question

I am using Struts + Velocity in a Java application, but after I submit a form, the confirmation page (Velocity template) shows the variable names instead an empty label, like the Age in following example:

Name: Fernando

Age: {person.age}

Sex: Male

I would like to know how to hide it!

score 78 · Accepted Answer · edited Jul 25 '17 at 21:44

78

You can mark variables as "silent" like this:

$!variable

If $variable is null, nothing will be rendered. If it is not null, its value will render as it normally would.

edited Jul 25 '17 at 21:44

starwarswii

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answered Aug 23 '08 at 02:37

Jason Sparks

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score 14 · Answer 2 · answered Sep 15 '08 at 15:31

14

You will also need to be sure and use the proper syntax. Your example is missing the dollar before the variable. It should be $!{person.age}, not just {person.age}.

answered Sep 15 '08 at 15:31

Nathan Bubna

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Not to be funny but isn't your syntax also incorrect? You don't use curly brackets around a velocity variable do you? – Duran Wesley Harris Apr 12 '16 at 10:49
Yes, i do. They are optional, though. :) We call it "formal syntax". – Nathan Bubna Apr 12 '16 at 14:43
Oh, well .. I better check that out then! – Duran Wesley Harris Apr 13 '16 at 05:59
More info on Formal Reference Notation is avalable [here](http://velocity.apache.org/engine/1.7/user-guide.html#formal-reference-notation). – starwarswii Jul 25 '17 at 14:30

How I hide empty Velocity variable names?

2 Answers2