Adding JavaScript to a PrestaShop CMS page

In Prestashop 1.7 function code to add a Javascript is little changed.

To add Javascript to a specific CMS Page in prestashop open /override/controllers/front/CmsController.php and add below code in it.

public function setMedia()
{
 parent::setMedia();
 
 if ((int)Tools::getValue('id_cms') == 17) {
 $this->registerJavascript('theme-custom', '/assets/js/your-js.js', ['position' => 'bottom', 'priority' => 2000]);
 $this->registerStylesheet('theme-custom', '/assets/css/your-css.css', ['media' => 'all', 'priority' => 2000]);
 }
}

above code will add Javascript and CSS to only CMS Page ID 17.

You can add JS in /themes/your-custom-theme/assets/js/your-js.js and CSS in /themes/your-custom-theme/assets/css/your-css.css