Enviar seleção de dados para um Select2

.php

<?php

public static function onChangeProduto($param = null) 
    {
        try 
        {
            //code here
            if(!empty($param['key']))
            {
                //code here
                TTransaction::open(self::$database);

                $objeto = Produto::find( $param['key'] );

                $field_id = explode('_', $param['_field_id']);
                $field_id = end($field_id);

                $location_id    = $param['location_id'];
                $product_uom_id = $objeto->uom_id;

                $object = new stdClass();

                $object->{"product_uom_id_{$field_id}"}    = $product_uom_id;
                
                // JS to update tfiledlist select2 uom_id
                TScript::create( "$('#product_uom_id_{$field_id}').val('{$product_uom_id}');" );
                TScript::create( "$('#product_uom_id_{$field_id}').trigger('change')" );

                //get main location_id and set on Select2              
                $object->{"location_id_{$field_id}"}       = $location_id;
                
                // JS to update tfiledlist select2 location_id
                TScript::create( "$('#location_id_{$field_id}').val('{$location_id}');" );
                TScript::create( "$('#location_id_{$field_id}').trigger('change')" );

                TForm::sendData(self::$formName, $object);

                TTransaction::close(); // close the transaction    
            }

        }
        catch (Exception $e) 
        {
            new TMessage('error', $e->getMessage());    
        }
    }