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In my plugin I use the hook displayAdminOrder in this way:

public function hookDisplayAdminOrder($params)
    {
        $orderId = Tools::getValue('id_order'); // mi prendo l'id dell'ordine per le query sui docId
        $order = new Order($orderId);
        $order_status = $order->getCurrentOrderState();
        //$order_status_name = $orderId;
        if(is_object($order_status)){
            if($order_status->name[1] == 'Annullato')
                $order_status_name = '';
            else
                $order_status_name = $order_status->name[1];    
        }else{
            $order_status_name = $order_status;
        }
        $query = 'SELECT docIdMyModule, docIdOrderMyModule, apiResponseOrder, apiResponseInvoice FROM '._DB_PREFIX_.'orders WHERE id_order=\'' . $orderId . '\';';
        $docIdMyModule = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query)['docIdMyModule'];   
        $docIdOrderMyModule = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query)['docIdOrderMyModule'];
        $apiResponseOrder = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query)['apiResponseOrder'];  
        $apiResponseInvoice = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query)['apiResponseInvoice'];  
        $json_apiResponseOrder = json_decode($apiResponseOrder);
        $json_apiResponseInvoice = json_decode($apiResponseInvoice);
        $config_CreaOrdine =  Configuration::get('PS_CREAZIONE_ORDINE');
        $config_CreaFattura =  Configuration::get('PS_CREAZIONE_FATTURA');
                
        // uso order_documents per il contatore nel template
        $order_documents = 0;
        if ($docIdMyModule xor $docIdOrderMyModule) // incremento di uno se trovo uno dei due dati
            $order_documents++;
        else if ($docIdMyModule && $docIdOrderMyModule)
            $order_documents = 2;    
        
        if(!$config_CreaOrdine){
            $message_order = 'creazione documento disabilitata';
        } else if(empty($order_status_name)){
            $message_order = 'ordine annullato in Prestashop';
        } else {    
            if(!empty($docIdOrderMyModule))
                $message_order = 'documento salvato in MyModule';
            else
                $message_order = 'documento NON salvato in MyModule';
        }

        if(!$config_CreaFattura){
            $message_invoice = 'creazione documento disabilitata';
        } else if(empty($order_status_name)){
            $message_invoice = 'ordine annullato in Prestashop';    
        } else {
            if(!empty($docIdFattura24))
                $message_invoice = 'documento salvato in Fattura24';
            else
                $message_invoice = 'documento NON salvato in Fattura24';
        }

        smartyRegisterFunction($this->context->smarty, 'function', 'saveOrder', array($this, 'smartyOrder')); // aggiungo la funzione per salvare di nuovo l'ordine
        smartyRegisterFunction($this->context->smarty, 'function', 'saveInvoice', array($this, 'smartyInvoice')); // aggiungo la funzione per salvare di nuovo la fattura
        
        $this->context->smarty->assign('id_order', $orderId);
        $this->context->smarty->assign('order_status_name', $order_status_name); //se l'ordine è annullato nascondo i pulsanti
        $this->context->smarty->assign('config_CreaOrdine', $config_CreaOrdine);
        $this->context->smarty->assign('config_CreaFattura', $config_CreaFattura);
        $this->context->smarty->assign('order_documents', $order_documents); // contatore documenti salvati
        $this->context->smarty->assign('mymodule_invoice_docId', $docIdMyModule); //docId per tasto fattura
        $this->context->smarty->assign('mymodule_invoice', $message_invoice);
        $this->context->smarty->assign('mymodule_order_docId', $docIdOrderMyModule); //docId per tasto ordine
        $this->context->smarty->assign('mymodule_order', $message_order);
               
        return $this->display(__FILE__, 'views/templates/hook/admin_order.tpl');
}

Here below admin_order.tpl :

<div class="panel" id="MyModule">
    <div class="panel-heading">
        <i class="icon-money"></i>{l s='MyModule' mod='mymodule'}
        <span class="badge">{$order_documents}</span>
    </div>
        <table>
            <tbody>
                <thead>
                    <tr>
                        <td><strong>{l s='Stato ordine' mod='mymodule'}   </strong></td>
                        <td style="padding-left: 20px;"><strong>{l s='Stato fattura' mod='mymodule'}  </strong></td>
                    </tr>
                </thead>  

                <!--<tr>
                    <td> Ordine : {$order_status_name} </td>
                <tr>-->
                <tr>
                    <td id="f24_order">{$mymodule_order}</td>
                    <td id="f24_invoice" style="padding-left: 20px;">{$mymodule_invoice}</td>
                </tr>
                
                <tr>
                    <td>
                        {if $order_status_name neq '' && $mymodule_order_docId == '' && $config_CreaOrdine eq 1}  
                           <button type="submit" name="submit_order" id="submit_order" class="btn btn-primary" onclick={saveOrder}>Salva Ordine</button>
                        {/if}
                    </td>
                    
                    <td style="padding-left: 20px;">
                        {if $order_status_name neq '' && $mymodule_invoice_docId == '' && $config_CreaFattura neq 0 } 
                            <button type="submit" name="submit_invoice" id="submit_invoice" class="btn btn-primary" onclick={saveInvoice}>Salva Fattura</button>
                        {/if}
                    </td>
                </tr>
                
            </tbody>
        </table>
    </div>
</div>    
<script>
var orderbtn = document.getElementById("submit_order");

if(orderbtn !== null){
    orderbtn.addEventListener('click', function (e) {
        orderbtn.style.display = "none";
        location.reload();
    
    });
}    

var invoicebtn = document.getElementById("submit_invoice");

if(invoicebtn !== null){
    invoicebtn.addEventListener('click', function (e) {
        invoicebtn.style.display = "none";
        location.reload();
    });  
}      
</script>

In mymodule.php file I set up smartyOrder and smartyInvoice functions and I wish to execute them only when I click on the button. At the moment the functions are called also when I update an order.

Here below the smartyOrder function for example: 

function smartyOrder($params){
        
        $config_CreaOrdine =  Configuration::get('PS_CREAZIONE_ORDINE');
        $orderId = Tools::getValue('id_order'); // mi prendo l'id dell'ordine per le query sui docId
        $check_order = new Order($orderId);
        $order_status = $check_order->getCurrentOrderState(); // controllo lo stato dell'ordine prima di tutto
        if(is_object($order_status)){
            if($order_status->name[1] == 'Annullato')
                $order_status_name = '';
            else
                $order_status_name = $order_status->name[1];    
        } else {
            $order_status_name = $order_status;
        }
             
        $query = 'SELECT docIdMyModule, docIdOrderMyModule, apiResponseOrder, apiResponseInvoice FROM '._DB_PREFIX_.'orders WHERE id_order=\'' . $orderId . '\';';
        $docIdOrderMyModule = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query)['docIdOrderMyModule'];  
        $apiResponseOrder = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query)['apiResponseOrder'];  
        //$apiResponseInvoice = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query)['apiResponseInvoice']; 
        $obj_apiResponseOrder = json_decode($apiResponseOrder);
        //$obj_apiResponseInvoice = json_decode($apiResponseInvoice);

        $this->afterHook($check_order, false); 

        if(!empty($docIdOrderMyModule)){
            $query = 'UPDATE ' . _DB_PREFIX_ . 'orders SET docIdOrderMyModule=\'' . $docIdOrderMyModule . '\' WHERE id_order=\'' . $orderId . '\';';
            Db::getInstance()->Execute($query);
            //$this->downloadDocument($docIdOrderMyModule, $orderId, true);
        } else if (!empty($obj_apiResponseOrder->description)) { // con questa condizione popolo il docId anche nel caso in cui il documento è già esistente in MyModule
            $query = 'UPDATE ' . _DB_PREFIX_ . 'orders SET docIdOrderMyModule=\'' . $obj_apiResponseOrder->description . '\' WHERE id_order=\'' . $orderId . '\';';
            Db::getInstance()->Execute($query); 
        }
    }

Any suggestion? thank you very much