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Velocity #parse but assign it to a variable

Answer 1

+3 A:

You can do this using VelocityLayoutServlet which is part of VelocityTools.

This allows you to define a layout for your application -- let's call it application.vm -- in which you can parse in headers, footers etc and declare where the main body content is placed using the screen_content declaration, e.g:

<html>
  <head>
    <title>$subject</title>
  </head>
  <body>
  #parse("header.vm") 
  $screen_content
  #parse("footer.vm") 
  </body>
</html>

VelocityLayoutServlet will evalulate the templates (and, hence, variables) before rendering which allows you to set a $subject variable in your body template, e.g:

#set($subject = "My Subject")
<div id="content">
</div>

More detailed information can be found in the Velocity documentation.

Olly 2008-10-28 13:20:00

Answer 2

A:

If I understand you correctly, you want to have a Velocity variable named $subject interpolated into the header.vm and the body.vm templates. Right now, the variable is defined in the body.vm template, so you cannot refer to it in the earlier template header.vm.

Why don't you abstract out the definition of $subject into its own template snippet, called globals.vm say, then include that in the top-level template. So you'd have:

#parse("globals.vm")
#parse("header.vm")
#parse("body.vm")
#parse("footer.vm")

Dov Wasserman 2008-10-30 05:31:31

Answer 3

+3 A:

Hi,

Either of the two solutions above would work. The VelocityLayoutServlet solution requires an extra package (also from Velocity) called Velocity Tools. I'm partial to this approach (and variants) myself.

A third method is simply to put the #parse within quotes:

set ($body="#parse('body.vm')")

Within a #set, anything in double quotes is evaluated. Strings within single quotes are passed in literally.

Will Glass 2008-10-31 02:47:25

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