Wow thank you Mark... yes, I wanted it for text but already tested it with 
both tags and text and works just great...
I miss those kind of examples (how to join two variables) on the Tiddlywiki 
main documentation though :)

Thanks again!

On Friday, October 14, 2016 at 7:35:39 PM UTC+2, Mark S. wrote:
> You don't specify a field in your actionsetfield widget, but I'm guessing 
> that you're trying to change the tags?
> My recipe is to use a macro for concatenation. Since using a macro with 
> parameter tends to break it I always put the intended concatenation items 
> into variables. Then the macro concatenates the list. Here's some code:
> \define concat() [[$(ltr)$]] [[$(num)$]]
> <$select field='letter'>
> <option>A</option>
> <option>B</option>
> <option>C</option>
> </$select>
> <$select field='number'>
> <option>1</option>
> <option>2</option>
> <option>3</option>
> </$select>
> <$vars ltr={{!!letter}} num={{!!number}}>
> <$button>
> Something
> <$action-setfield $tiddler="Mixing variables examples" $field="tags" 
>  $value=<<concat>>/>
> </$button>
> </$vars>
> On Friday, October 14, 2016 at 10:17:11 AM UTC-7, Fidel N wrote:
>> After a while I realized the new tiddlers are actually being created with 
>> a variable inside called "aaa" and another "bbb" and the text is "{{!!aaa}} 
>> {{!!bbb}}" and it renders good but its not creating the tiddler with the 
>> evaluated text.
>> Did someone manage to create a new tiddler with the text inside several 
>> variables of the current tiddler?
>> I have tried with macros and all sort of variable combinations but in the 
>> end the text within the new tiddler is always "{{!!aaa}} {{!!bbb}}", never 
>> the content of those variables :(
>> On Friday, October 14, 2016 at 12:41:38 PM UTC+2, Fidel N wrote:
>>> Hi all:
>>> I had a hard time finding this either in tiddlywiki documentation or 
>>> this group, so Im posting this in case its helpful or someone decides to 
>>> post it to the main Tiddlywiki documentation.
>>> I wanted to dynamically create a new tiddler which text should come from 
>>> a list of combo-boxes, but I couldnt find the way to mix all the variables 
>>> into the resulting tiddliwiky tiddler.
>>> I asked a very skilled friend of mine and he came with this solution 
>>> that I would have never imagined or found:
>>> <$select field='letter'>
>>> <option><$action-setfield letter/>A</option>
>>> <option><$action-setfield letter/>B</option>
>>> <option><$action-setfield letter/>C</option>
>>> </$select>
>>> <$select field='number'>
>>> <option><$action-setfield number/>1</option>
>>> <option><$action-setfield number/>2</option>
>>> <option><$action-setfield number/>3</option>
>>> </$select>
>>> <$button>
>>> Something
>>> <$action-setfield $tiddler="Mixing variables examples" tags='mixed_vars' 
>>> aaa={{!!number}} bbb={{!!letter}} $value="{{!!aaa}} {{!!bbb}}"/>
>>> </$button>
>>> The key is the following part, in which current tiddler variables are 
>>> stored into the ones that are evaluated again from within the new tiddler:
>>> aaa={{!!number}} bbb={{!!letter}}
>>> This solution is super simple, fast, and requires no macros.
>>> Best regards!

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