在prestashop 1.7的管理模块中启用jquery2

I'm using prestashop 1.7.2.0 to write an admin module that adds nested categories and products from a csv file. I understood that addJQuery() is deprecated and I'm trying to get jquery code to work. I get Uncaught ReferenceError: $ is not defined.

I have created a displayBackOfficeHeader hook with the following:

public function hookDisplayBackOfficeHeader(){
    $this->context->controller->addJS($this->_path.'/js/jqShim.min.js');
    $this->context->controller->addCSS($this->_path.'/css/getcontent.css');
    $this->context->controller->addJS($this->_path.'/js/getcontent.js');
}

as you can see I have tried including jqShim.min.js and I still got the same error. what am I missing?

Thanks

You can include $this->context->controller->addJquery(); in first line of your hookDisplayBackOfficeHeader() function.