.ics file with only contain certain categories?

You can restrict the ics file to only include certain categories using the following code snippet:

add_filter('em_calendar_template_args',  function( $args ) {
    $args['category'] = [ 'category_1', 'category_2' ];
    return $args;
});

Replace the comma separated list of categories with the categories that you want to include. You can use either the category id or the category slug. If you put a minus sign in front of the category slug or id it will exlude that category.

You can use the Code Snippets plugin to add the above code snippet.

• This reply was modified 2 months, 3 weeks ago by joneiseman.

You can use the Code Snippets plugin to add the code snippet. Here are some other options: https://www.wpbeginner.com/beginners-guide/beginners-guide-to-pasting-snippets-from-the-web-into-wordpress/

Change the code snippet to this:

add_filter('em_calendar_template_args',  function( $args ) {
    if (!empty($_GET) && is_array($_GET) && array_key_exists('category', $_GET)) {
        $category = sanitize_text_field($_GET['category']);
        $categories = explode(',', $category);
        $args['category'] = $categories;
    }
    return $args;
});

Then use a url like this:

https://mysite.com/events/?ical=1&category=category_1,category_2

This will allow you to use the query args to specify which categories you want to include in your ics file.

You could extend this to filter by other event search parameters for example tags and scope:

add_filter('em_calendar_template_args',  function( $args ) {
    if (!empty($_GET) && is_array($_GET)) {
        if (array_key_exists('category', $_GET)) {
            $category = sanitize_text_field($_GET['category']);
            $categories = explode(',', $category);
            $args['category'] = $categories;
        }
        if (array_key_exists('tag', $_GET)) {
            $tag = sanitize_text_field($_GET['tag']);
            $tags = explode(',', $tag);
            $args['tag'] = $tags;
        }
        if (array_key_exists('scope', $_GET)) {
            $scope = sanitize_text_field($_GET['scope']);
            $args['scope'] = $scope; // for example all,past,future,... 
        }
    }
    return $args;
});

• This reply was modified 2 months, 3 weeks ago by joneiseman. Reason: correct the urll example
• This reply was modified 2 months, 3 weeks ago by joneiseman.

Yes, you can put the code snippet in the functions.php of your child theme.