Re: Dynamic interpolation names

In FreeMarker you can do both aHash.somethingFix and
aHash[somethingDynamic], where somethingDynamic can be whatever
expression, including a variable reference. The only tricky thing in
your case is to get a top-level hash somehow. For that see:
http://freemarker.org/docs/ref_specvar.html

So, for example you can write:

  <#if .data_model["menu" + menuNumber]??>
  
or if you want data-model shadowing to work:

  <#if .vars["menu" + menuNumber]??>

-- 
Best regards,
 Daniel Dekany


Friday, February 8, 2008, 4:26:31 PM, Andrew Moore wrote:

> Hi,
> I'm trying to display a list of data to the screen where each of the
> elements has a unique number
> for example i've done: 
>    root.put('menu1','details here');
>    root.put('menu2','details here');
>    root.put('menu3','details here');
>
> When it comes to displaying details in the freemarker template, I'm then
> writing out the data with something like this:
>       <#if menu1??> DO LOTS HERE</#if>
>       <#if menu2??> DO LOTS HERE</#if>
>       <#if menu3??> DO LOTS HERE</#if>
>
> I know it's not very nice because there's lots of repeating code, so I'd
> though of doing it as a macro.
> What I'd like is something like
>    <@listMenu menuNumber="1">
>    <@listMenu menuNumber="2">
>    <@listMenu menuNumber="3">
>
>     <#macro listMenu menuNumber>
>           <#if menu!MENUNUMBER!??> DO LOTS HERE</#if>
>     </#macro>
>
> where !MENUNUMBER! is the value passed into the parameter.
>
> But I'm not sure what syntax I should use. I've done macros where values
> have been passed in and used within the macro, but not where they form part
> of the name of the interpolation. Is there any way I can dynamically
> reference interpolation names?
>
> Hope that makes some sense!
>
> If there's a better way to do it also, that would be great, but due to the
> design of the system (that's not under my control) I'm stuck with menu1,
> menu2, menu3 etc instead of having a list.
>
> Thanks
> Andrew 



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