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From Nicolas LE BAS <m...@nlebas.net>
Subject Re: Variables in Tiles EL
Date Mon, 28 Nov 2011 18:27:00 GMT
On 11-11-23 05:45 PM, Pascual Pereda wrote:
> Hi,
> I'm using tiles 2.2 with Spring MVC. I use Expression Language in my tiles-defs.xml file,
so it's full of definitions like this:
> <definition name="test" extends="base">
>    <put-attribute name="body" expression="/view/${variable.property ? 'foo' : 'bar'}/test.jspx"/>
> </definition>
> As the same big expression is replicated across all my definitions, I was wondering if
there was some way to define it only once, and use a simpler expression like ${folder} instead
of the complicated one.
> Thanks in advance


I don't know any expession language that will allow you to declare 
variables, and I don't think you can use tiles attributes directly (I 
think Antonio will correct me if I'm wrong)

But since this is decision logic, I think tiles-defs.xml is not the 
right place for it. What if you need to decide something more 
complicated than "foo" or "bar" in the future?

I would make the decision in the controller, or if you really don't want 
to, in a ViewPreparer like this (see also 

public class ThemePreparer implements ViewPreparer {

     public void execute(TilesRequestContext tilesContext, 
AttributeContext attributeContext) {
	MyVariable variable = (MyVariable) tilesContext
         String theme = variable.getProperty() ? "foo" : "bar";
         tilesContext.getRequestScope().put("theme", theme);

<definition name="base" preparer="org.example.ThemePreparer" ... >

<definition name="test" extends="base">
    <put-attribute name="body" expression="/view/${theme}/test.jspx"/>

Hope this helps.

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