addJS function not working for admin in prestashop

Question

I am trying to add javascript file in prestashop admin using backOfficeHeader hook using a module but nothing happened. My code is given below.

Answer 1

For me "this->_path" dosn't work. My solution is to use $_SERVER['DOCUMENT_ROOT']

public function hookActionAdminControllerSetMedia($params)
{
    // add necessary javascript to products back office
    if($this->context->controller->controller_name == 'AdminProducts' && Tools::getValue('id_product'))
    {
        $this->context->controller->addJS($_SERVER['DOCUMENT_ROOT']."/modules/apl/views/js/jquery.ui.touch-punch.min.js");
    }
}