Hide carriers in delivery choice

[Serial]

Hi,

 

I have several shops to which my customer can be delivered his order.

Simply, I created every stores as a carrier.

Now, for not to show 35 differents stores during the choice of the delivery, I have created a first carrier who's name "Retreat in store". Inside, so in my order-carrier.tpl, I created a list which fetches by a request SQL my stores and which show them in this list. All this works perfectly, this is my code here :

 

Order-carrier.tpl

{if $option.unique_carrier}
<!-- Ajout liste déroulante pour sélectionner magasin seulement si Retrait en magasin -->
	{if $carrier.instance->id=="13"}
		<strong>{$carrier.instance->name|escape:'htmlall':'UTF-8'}</strong>
		<br/>{l s='Veuillez choisir le magasin :'} <select name="choix_magasin" id="choixmag">
		<option value="0" select="selected">--</option>
		{foreach $stores as $store}
		    <option value="{$store.id_store}">{$store.city}</option>
		{/foreach}
                </select>
	{/if}
<!-- Jusqu'ici -->

So, how (in my .js I suppose) can I show just the line of the store corresponding to what the user chooses in the list which I have just created before ?

Two small constraints:

I would like as well as tick automatically this store on the left.
Finally, if the customer don't want to be delivered in store, I would like that when he chooses an option other than the "Retreat in store", it's not either all the list of 35 differents carriers.

 

Thanks

Edited August 19, 2015 by Serial (see edit history)