Re: Another Idea/Question

Saturday, November 8, 2008, 6:29:38 PM, Luther Baker wrote:

> Hope I'm not bothering anyone's time but wanted to run another idea past you.
>
> I know that a macro can be implemented by a Java class as well as a text template.
>
> I have a desire to do 'both' simultaneously.
>
> In otherwords, I would like write
>
> <@editor user/> (where 'user' is some simple POJO that exists on
> the page with certain properties).
>
> and have it invoke a Java class (to populate the Map) and then a template (which uses the Map)
>
> For example:
>
> a) Invoke x.y.z.Editor.execute(Map mapOut, Args args) 
>
> { 
> /*reflect into arg[0] and determine props or just hardcode as here */ 
> mapOut.put("fieldOne", user.firstName); mapOut.put("fieldTwo", user.lastName);
> }
>
> b) Invoke like named macro
>
> <#macro editor>
> ${fieldOne} ${fieldTwo}
> </#macro>
>
> This is obviously a simple example. I think I can do this
> indirectly by creating a general Java macro that would perform steps A and B like this:
>
> <@DualMacro editor/>
>
> Where x.y.z.DualMacro.execute(...) could then instantiate the class
> (Editor.class) and load the like-named template. I would end up with a bunch of
>
> <@DualMacro table/>
> <@DualMacro signupForm/>
>
> but it would still work. Is there a more elegant way to do this in FM?

I think the usual way of doing this is that you write the "editor"
macro in FTL, and then that macro calls out for the java code
explicitly:

<#macro editor>
  <#local m = macroHelpers.editor()> <#-- calls a Java method -->
  ${m.fieldOne} ${m.fieldTwo}
</#macro>

(In any case, conveniently calling a macro has much higher priority
than conveniently defining it, so writing <@DualMacro table/> and like
into your templates is most certainly a bad idea.)

-- 
Best regards,
 Daniel Dekany


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