Conditional Tag checkig if the parent of a page is a specific page doesn’t work

[misionis]

Hello everybody, my name is Michael and I build websites on WordPress. For not a long time I work with Genesis framework.

I'm trying to set the conditional tag, that will allow me te set custom, specific sidebar to a specific page and to all of it's child pages without just listing them all (maybe for grandchilds also). I could just list them on my website, but when I build one to my client, it's problematic.

So, I've putted this to my functions.php:

genesis_register_sidebar( array(
	'id'            => 'sidebar-realizacje',
	'name'          => __( 'sidebar realizacje', 'Genesis Sample' ),
	'description'   => __( 'tutaj wstawiamy sidebar realizacje', 'Genesis Sample' ),
) );

genesis_register_sidebar( array(
	'id'            => 'sidebar-wiedza',
	'name'          => __( 'sidebar wiedza', 'Genesis Sample' ),
	'description'   => __( 'tutaj wstawiamy sidebar wiedza', 'Genesis Sample' ),
) );

add_action('get_header','ms_change_sidebar');
function ms_change_sidebar() {
    
    if ( get_post_type() == 'realizacje' ) { 
        remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
        remove_action( 'genesis_sidebar', 'ss_do_sidebar' );
        add_action( 'genesis_sidebar', 'dodaj_sidebar_realizacje' ); 
    }
	elseif ( is_page( '18' ) || '18' == $post->post_parent ) { 
        remove_action( 'genesis_sidebar', 'genesis_do_sidebar' ); 
        remove_action( 'genesis_sidebar', 'ss_do_sidebar' ); 
        add_action( 'genesis_sidebar', 'dodaj_sidebar_wiedza' ); 
    }
}

function dodaj_sidebar_realizacje() {
		genesis_widget_area( 'sidebar-realizacje', array(
			'before' => '<div class="sb-realizacje widget-area">',
			'after' => '</div>',
	) );
}
function dodaj_sidebar_wiedza() {
		genesis_widget_area( 'sidebar-wiedza', array(
			'before' => '<div class="sb-wiedza widget-area">',
			'after' => '</div>',
	) );
}

In result, I have propor sidebar in custom post types 'realizacje', and page id'18' as well, but child pages of '18' still have primary sidebar.

The code snippet is taken from https://developer.wordpress.org/themes/basics/conditional-tags/

<?php if ( is_page( 'about' ) || '2' == $post->post_parent ) {
    // the page is "About", or the parent of the page is "About"
    $bannerimg = 'about.jpg';
} elseif ( is_page( 'learning' ) || '56' == $post->post_parent ) {
    $bannerimg = 'teaching.jpg';
} elseif ( is_page( 'admissions' ) || '15' == $post->post_parent ) {
    $bannerimg = 'admissions.jpg';
} else {
    $bannerimg = 'home.jpg'; // just in case we are at an unclassified page, perhaps the home page
}
?>

I've set php7.0 on my hosting - maybe this is a problem.

My website:
http://miastostron.pl/
'18' - http://miastostron.pl/baza-wiedzy/
'18' child example - http://miastostron.pl/baza-wiedzy/co-to-jest-anchor-text-linku/

Thank You very much! 🙂

http://miastostron.pl/

[Victor Font]

The only thing that I can see is that you are not referencing the global $post variable in your function. You should have global $post; at the top of the function. Also, it could be your timing. The $post variable is in the loop. You are rendering the sidebars in the header, before the loop is called. You might want to look at get_page_children(). https://codex.wordpress.org/Function_Reference/get_page_children

---

Regards,

Victor
https://victorfont.com/
Call us toll free: 844-VIC-FONT (842-3668)
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[misionis]

Thank You very much for Your answear. The problem is I'm not a php developer and my skills in it are at the beginner level.

But I've found the solution that works fine. Maybe someone will have similar issue, so I pase it below. Regards.

function is_tree($pid) {      // $pid = The ID of the page we're looking for pages underneath
    global $post;         // load details about this page
    $anc = get_post_ancestors( $post->ID );
    foreach($anc as $ancestor) {
        if(is_page() && $ancestor == $pid) {
            return true;
        }
    }
    if(is_page()&&(is_page($pid))) 
               return true;   // we're at the page or at a sub page
    else 
               return false;  // we're elsewhere
};

add_action('get_header','ms_change_sidebar');
function ms_change_sidebar() {
    
    if ( is_page( 'baza-wiedzy' ) || is_tree('18') ) { 
        remove_action( 'genesis_sidebar', 'genesis_do_sidebar' ); 
        remove_action( 'genesis_sidebar', 'ss_do_sidebar' ); 
        add_action( 'genesis_sidebar', 'dodaj_sidebar_wiedza' ); 
    }
}

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