[VELOCITY-603] improvate #evaluate example

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.6
• Component/s: Documentation
• Assignee: Unassigned
• Reporter: William Glass-Husain
• Created: 13/Jul/08 23:38
• Updated: 02/Sep/08 22:18
• Resolved: 02/Sep/08 22:18

Description

---------- Forwarded message ----------
From: Luan Nguyen <[e-mail]>
Date: Mon, Oct 22, 2007 at 8:56 PM
Subject: Evaluate Section
To: [e-mail]

Hello,In the Evaluate section, there are two different variables: $source1
and $source. How can it display "abc" when $source is never defined?

Evaluate

The #evaluate directive can be used to dynamically evaluate VTL. This
allows the template to evaluate a string that is created at render time.
Such a string might be used to internationalize the template or to include
parts of a template from a database.

The example below will display abc.

#set($source1 = "abc")
#set($select = "1")
#set($dynamicsource = "$source$select")
#evaluate($dynamicsource)

---------- Forwarded message ----------
From: Will Glass-Husain <[e-mail]>
Date: Tue, Oct 23, 2007 at 9:55 AM
Subject: Re: Evaluate Section
To: Velocity Developers List <[e-mail]>

That's a good point though. Perhaps the example should use concatenation to be clearer. The single quotes prevent evaluation.

#set($dynamicsource = '$source' + "$select")

WILL