interpolation of variables ...

[Chris Joelly <ch...@unycom.com>]

Hello!

i'm new to velocity and run into the following problem:

i set some data into the context from within my action class:

context.put("field-23", "data23");
context.put("field-24", "data24");
....

then in the velocity template i wanna do something like:

#foreach ( $df in $datafields )
	#set ( $fieldname = "field-$df.getFieldId()" )
	#set ( $fieldvalue = "${$fieldname}" )
	<input type="text" name="$feldname" value="$fieldvalue"/>	
#foreach

i wanna set a variable name dynamically and then lookup the context for
the value of this variable...

is this possible with velocity? if so, can anybody tell me how to do?

thx, Chris

-- 
mit freundlichen Grüßen / with kind regards
 
Ing. Christian Jölly @ Solutions
unycom  Information Technology Services GmbH
A-8042 Graz | Schmiedlstraße 1 / III

Tel: ++43 (0)316 / 818 828 - 30
Fax: ++43 (0)316 / 818 828 - 38
chris.joelly@unycom.com
http://www.unycom.com

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Re: interpolation of variables ...

[Claude Brisson <cl...@savoirweb.com>]

you must use an evaluator tool - there are two versions of those evaluators
provided in the tools subproject

CASE 1 : if you're not using VelocityViewServlet

context.put("ctx", context);
context.put("render", new org.apache.velocity.tools.generic.RenderTool());

then in the template :

#set ( $fieldname = "field-$df.getFieldId()" )
#set ( $fieldvalue =  $render.eval($ctx,"$fieldname"))

-------------

CASE 2 : if you're using VelocityViewServlet

add the following entry to your toolbox.xml file :

  <tool>
    <key>render</key>
    <scope>request</scope>
    <class>org.apache.velocity.tools.view.tools.ViewRenderTool</class>
  </tool>

then in the template :

#set ( $fieldvalue =  $render.eval("$fieldname"))


--------------

Please note than case 1 will always work - case 2 is just the standard way
of using a tool with the VelocityViewServlet.

CloD


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