Assign result of a list in smarty variable

[Serial]

Hi,

 

I have a list field in my order-carrier.tpl :

<select name="choix_magasin" id="choixmag">
  <option value="0" selected>--</option>
   {foreach $stores as $store}
  <option value="{$store.id_store}">{$store.city}</option>
   {/foreach}
</select>

I want to assign the result of this list (simply the choice of the customer) in a smarty variable.

 

How it's possible ?