load_form_js example

 {
            wp_register_script( 'akismet-frontend', plugin_dir_url( __FILE__ ) . '_inc/akismet-frontend.js', array(), filemtime( plugin_dir_path( __FILE__ ) . '_inc/akismet-frontend.js' ), true );
            wp_enqueue_script( 'akismet-frontend' );
        }
    }

    /** * Add the form JavaScript when we detect that a supported form shortcode is being parsed. */
    public static function load_form_js_via_filter( $return_value, $tag, $attr, $m ) {
        if ( in_array( $tag, array( 'contact-form', 'gravityform', 'contact-form-7', 'formidable', 'fluentform' ) ) ) {
            self::load_form_js();
        }

        return $return_value;
    }
}