Display child pages full template including the content

Question

On a parent page I want to display all the childpages (first child only) including its template.

For Example

Pages:

Parentpage (Templatename: parentpage)
- Child A (Templatename: childpage)
- Child B (Templatename: childpage)
-- SecondChild B (Templatename: secondchildpage)
- Child C (Templatename: childpage)

In the Template parentpage I have this:

 <?php
    getchilds = array(
        'parent'        => $post->ID,
        'child_of'      => $post->ID, 
        'sort_column'   => 'menu_order',
        'sort_order'    => 'ASC'        
    ); 

    $postliset = get_pages($getchilds);
        foreach ($postliste as $post) {
        echo $post->post_content;
    }
?>

This displays the content of all the childpages on the parentpage. So far so good, but I want it to include the templatepart of the childpages as well. So if my childpage template would say:

<div class="childpagestest">
[...]
        <?php the_content(); ?> 
[...]
</div>

The parentpage should include this code.

I searched the whole function codes of WP for something like the_template but nothing.

Any ideas?

Thank you very much in advance.

Answer 1

I would try setting up post data in the loop and then calling a page template using get_template_part function. Note: depending on theme it may produce some unexpected results, as page template sometimes also includes site header and footer. But it's something to get you started.

$getchilds = array(
    'parent'        => $post->ID,
    'child_of'      => $post->ID,
    'sort_column'   => 'menu_order',
    'sort_order'    => 'ASC'
);

$postlist = get_pages($getchilds);

foreach ($postlist as $post) {

    // setup post data, so page template will use it as a "master" post
    setup_postdata($post); 

    // we get page template name for the post and remove ".php" at the end to make it work
    $template = preg_replace("/\.php$/", "", get_page_template_slug($post) ); 

    // now let WordPress fetch that page for you
    echo get_template_part($template);        
}