Display all posts under child sub category in sidebar on post page?

Question

I am trying to make a custom sidebar for my posts in certain categories. It will look something like this.

My category structure looks like this:

• Parent 1
  • Child 1
    • Sub Child 1
    • Sub Child 2
  • Child 1
    • Sub Child 1
    • Sub Child 2
• Parent 2

What I want to do is to display all posts under Sub Child 1 and 2. I will be more specific, lets say we have 3 posts, 2 of them is under sub child 1 and last one is under sub child 2. Then I only want the 2 posts that is under sub child 1 to be displayed under Sub child 1, and the 3 :rd post to display only under sub child 2.

I have been looking in 2 days now over the Internet to figure this out how to do this, but I dont get what I am doing wrong.

Here is my code and what I am trying to modify:

<?php 
$cat = get_the_category();
$catID = get_cat_ID($cat);
$subcats = get_categories('child_of=' . $catID);
    foreach($subcats as $subcat) {
    echo '<h3>';
    echo '<a href="' . get_category_link($subcat->cat_ID) . '">';
    echo '/' . $subcat->cat_name . '';
    echo '</a></h3>';
    echo '<ul>';
    $subcat_posts = get_posts('cat=' . $subcat->cat_ID);
    foreach($subcat_posts as $subcat_post) {
        $postID = $subcat_post->ID;
    echo '<li>';
    echo '<a href="' . get_permalink($postID) . '">';
    echo get_the_title($postID);
    echo '</a></li>';
    }
    echo '</ul>';
} 
?>

Any ideas?

Answer 1

I guess you could take a big step using wp_list_categories() with a walker to add a additional Unordered List to every item.

The code:

$cat_id = get_query_var( 'cat' );
$subcats = get_categories( 'child_of=' . $cat_id ); // child categories

class Cat_Walker extends Walker_Category {
    function end_el( &$output, $page, $depth = 0, $args = array() ) {
        $posts = get_posts( 'cat=' . $page->term_id );

        if ( sizeof( $posts ) > 0 ) {
            $output .= '<ul>';

            foreach ( $posts as $post ) {
                $output .= sprintf( '<li><a href="%1$s">%2$s</a></li>', get_permalink( $post->ID ), $post->post_title );
            }

            $output .= '</ul>';
        }

        $output .= '</li>';
    }
}

foreach ( $subcats as $subcat ) {
    $subsubcats = get_categories( 'child_of=' . $subcat->term_id ); // sub child categories

    foreach ( $subsubcats as $subsubcat ) {
        $args = array(
            'title_li'         => '',
            'show_option_none' => '',
            'taxonomy'         => 'category',
            'child_of'         => $subsubcat->term_id,
            'walker'           => new Cat_Walker( )
        );

        wp_list_categories( $args );
    }
}

Answer 2

Finally, after searching all day .. collecting & combine the code.. this is it :

<?php $categories =  get_categories('child_of='.get_queried_object()->term_id); if(!empty($categories)):  
        foreach ($categories as $category) {
        $category_id = $category->term_id;
        query_posts('cat='.$category_id."&order=ASC");
        if ( have_posts() ) :
           ?>        <h3><?php echo $category->name; ?><span></span></h3><?php while ( have_posts() ) : the_post(); ?><ul><li><a href="<?php the_permalink();?>"><?php the_title(); ?></a></li></ul><?php endwhile;?><?php endif; 
    } endif; ?>

enjoy it :)

Answer 3

Function for getting all categories and their post for a particular parent category

function get_cat_subcat_posts($catid){
            $categories =  get_categories('child_of='.$catid);

            if(!empty($categories)):  

                foreach ($categories as $category) {

                $category_id = $category->term_id;

                query_posts('cat='.$category_id."&order=ASC");
                if ( have_posts() ) :
            ?>

                 <div class="detail_row">
                 <h3><?php echo $category->name; ?><span></span></h3>
                    <ul>
                <?php 

                // Start the Loop.
                while ( have_posts() ) : the_post();            
                ?>

                      <li><a href="<?php the_permalink();?>"><?php the_title(); ?></a></li>

                     <?php
                        endwhile;

                    ?>
                 </ul>
                  </div>

            <?php
                endif; 
                wp_reset_query();

                // Recall the category posts function
                get_cat_subcat_posts($category_id);

                }

            endif;

            }