the cleanest way would be to create a module and use the hook "actionAdminControllerSetMedia", then the method :
$this->context->controller->addJS($this->_path . 'extra.js')
to add some extra js in the Backoffice
the cleanest way would be to create a module and use the hook "actionAdminControllerSetMedia", then the method :
$this->context->controller->addJS($this->_path . 'extra.js')
to add some extra js in the Backoffice
the cleanest way would be to create a module and use the hook "actionAdminControllerSetMedia", then the method :
$this->context->controller->addJS($this->_path . 'extra.js')
to add some extra js