[Resolved] limit the category for blog post

[Kelvin]

Dear Sir/Madam,

This is the first I use the Site Library “SlideOut” I have different post categories, I want to limit the blog archive page to show some of the categories, how can I do that? By the way, for the single post, I also want to have the navigate with same category post only. How can I do that?

Best regards,

Kelvin

[David]

Hi there,

1. You would need to use this PHP snippet:

function exclude_categories_home( $query ) {
	if ( $query->is_home() && $query->is_main_query() ) {
		$query->set( 'cat', '-1, -5, -10' );
	}
	return $query;
}
	 
add_filter( 'pre_get_posts', 'exclude_categories_home' );

The -1, -5, -10 are the Category ID’s you want to remove. They must be prefixed by the -

2. Post Navigation set to within same category – try this snippet:

add_action( 'after_setup_theme', 'tu_category_specific_post_navigation' );
function tu_category_specific_post_navigation() {
    add_filter( 'generate_category_post_navigation', '__return_true' );
}

https://docs.generatepress.com/article/adding-php/

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/

[Kelvin]

Dear David,

Sorry, both don’t work on my site. I try put the $query->set() outside $query->is_home if block, all categories post show up.

When I view a single post, another category post still shows up.

Best regards,

Kelvin.

[David]

How did you add the code?

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/

[Kelvin]

Dear David,

Sorry, I placed to the wrong php script.

How can I include the category instead of excluding it?

Best regards,

Kelvin

[David]

Just remove the - ie. -5 means remove cat ID 5. Whereas 5 means include cat ID 5.

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/

[Kelvin]

Dear David,

If I change the $query->set( ‘cat’, ‘3, 4’ );

I got some problem, please visit https://prnt.sc/pbcs2j

[David]

I made an edit to the original code above. Use that and change it to the categories you want to select as per the last reply.

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/

[Kelvin]

Dear David,

Problem is solved.

Best regards,

Kelvin

[David]

You’re welcome

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/

[Author]

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