[Resolved] Previous / Next within parent/child relationship

[Author]

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[emilyT]

Hi Shane

You previously helped me with my prev/next navigation in this thread https://toolset.com/forums/topic/either-adding-prevnext-to-content-template-or-moving-related-posts-to-theme/

Would you be able to offer a little more assistance with this. I'll try to explain what I need:
If you look at this page it shows you all the paintings that are in the 'A Year at Cape Cornwall 2017' exhibition: hidden link
The exhibition is the parent content type and the paintings are all children of this.

I would like the Prev/Next links to be restricted to the paintings that are connected to the parent. But at the moment they take you through all the paintings, including those with different parents. Is there any way of doing this?

Many thanks, Emily

[Christian Cox]

Hi, please replace the code provided earlier with the updated code:

// Add Pagination Shortcode
function pagination() {
    $next_post = wpv_child(1, 'parent-ptypes', 'child');
    $previous_post = wpv_child(-1, 'parent-ptypes', 'child');
    $prev_pagination= '';
    $next_pagination = '';

    if($previous_post ){

        $prev_pagination = "<div class='navigation'><div class='previousnav'> <a href='".get_permalink($previous_post->ID)."'> << ".get_the_title($previous_post->ID)."</a></div>";
    }
    if($next_post){
        $next_pagination = "<div class='nextnav'><a href='".get_permalink($next_post->ID)."'> ".get_the_title($next_post->ID).">></a></div>";
    }

$pagination = "<div class='currentexb'><a href='<em><u>hidden link</u></em>''>GALLERY</a> >".get_the_title()."</div>";


return $prev_pagination.$pagination.$next_pagination;

}
add_shortcode( 'pagination', 'pagination' );

function wpv_child($step, $parentslug, $childslug) {
    global $post;
    $parent = get_post_meta($post->ID, '_wpcf_belongs_' . $parentslug
      . '_id', true);
    $children = get_posts(array('post_type' => $childslug, 'meta_key' => '_wpcf_belongs_' . $parentslug . '_id', 'meta_value' => $parent, 'numberposts' => -1));
    foreach ($children as $i => $child) {
        if ($child->ID == $post->ID) break;
    }
    $i += $step;
    if (isset($children[$i])) return $children[$i];
}

Let me know the results and we can go from there.

[emilyT]

Hi Christian

Thanks for your help with this. I've added it to a dev version of the site here: hidden link
As you can see, the prev/next links have completely disappeared.

The version of the function that I'm currently using here hidden link is:

// Add Pagination Shortcode
	function pagination() {
		$next_post = get_previous_post();
		$previous_post = get_next_post();
		$prev_pagination= '';
		$next_pagination = '';

		if($previous_post != 0 ){
			
			$prev_pagination = "<div class='previousnav'> <a href='".get_permalink($previous_post->ID)."'> < Previous</a></div>";
		}
		if($previous_post == 0 ){
			
			$prev_pagination = "<div class='previousnav'></div>";
		}
		if($next_post != 0){
			$next_pagination = "<div class='nextnav'><a href='".get_permalink($next_post->ID)."'> Next ></a></div>";
		}
		if($next_post == 0){
			$next_pagination = "<div class='nextnav'></div>";
		}

    $pagination = "<div class='currentexb'>PAINTINGS IN THIS SERIES</div>";
	

    return $prev_pagination.$pagination.$next_pagination;
 
	}
	add_shortcode( 'pagination', 'pagination' );

Many thanks, Emily

[Christian Cox]

Hi, there's one bit of code that you must update based on your parent post type slug:

$next_post = wpv_child(1, 'parent-ptypes', 'child');
$previous_post = wpv_child(-1, 'parent-ptypes', 'child');

Please replace 'parent-ptypes' with the slug of your parent post type and let me know the results.

[emilyT]

Hi Christian

I've replaced these two lines so that they say:

$next_post = wpv_child(1, 'exhibition', 'child');
$previous_post = wpv_child(-1, 'exhibition', 'child');

'exhibition' is the slug of the parent post type

Unfortunately it results in this (a mostly blank page): hidden link

Cheers, Emily

[Christian Cox]

Ok at this point it probably makes more sense for me to log in to your site, create a clone, and set this up for you so we're not passing errors back and forth. If you agree, please provide login credentials in the private reply fields here. I will install the Duplicator plugin and create a clone of your site, where I can do the necessary updates. Then when they're working, I will let you know what you should add to your code.

[Christian Cox]

Hi, I've updated your dev site's functions.php file to include the correct pagination shortcode:

// Add Pagination Shortcode
    function pagination() {
    $next_post = wpv_child(1, 'exhibition', 'painting');
    $previous_post = wpv_child(-1, 'exhibition', 'painting');
    $prev_pagination= '';
    $next_pagination = '';

    if($previous_post ){

        $prev_pagination = "<div class='navigation'><div class='previousnav'> <a href='".get_permalink($previous_post->ID)."'> << ".get_the_title($previous_post->ID)."</a></div>";
    }
    if($next_post){
        $next_pagination = "<div class='nextnav'><a href='".get_permalink($next_post->ID)."'> ".get_the_title($next_post->ID).">></a></div>";
    }

$pagination = "<div class='currentexb'><a href='<em><u>hidden link</u></em>''>GALLERY</a> >".get_the_title()."</div>";


return $prev_pagination.$pagination.$next_pagination;

}
add_shortcode( 'pagination', 'pagination' );

function wpv_child($step, $parentslug, $childslug) {
    global $post;
    $parent = get_post_meta($post->ID, '_wpcf_belongs_' . $parentslug
      . '_id', true);
    $children = get_posts(array('post_type' => $childslug, 'meta_key' => '_wpcf_belongs_' . $parentslug . '_id', 'meta_value' => $parent, 'numberposts' => -1));
    $i = 0;
    foreach ($children as $i => $child) {
        if ($child->ID == $post->ID) break;
    }
    $i += $step;
    if (isset($children[$i])) return $children[$i];
}

Can you take a look and confirm the links are acting appropriately?

[emilyT]

Hi Christian

That's working perfectly. You're a star! Thanks so much for your help with this.

Cheers, Emily

[alexd-6]

øh nice - thanx!

[alexd-6]

Hey - in my code if i in first Item - it shows in paginationprev child from other Parent. Here is my code and URL where you can see it:

hidden link

[php]// Add Pagination Shortcode
function paginationprev() {
$next_post = wpv_child(1, 'projekt', 'objekt');
// $previous_post = wpv_child(-1, 'projekt', 'objekt');
// $prev_pagination= '';
$next_pagination = '';

if($next_post ){

$next_pagination = "<div class='previousnav'> <a href='".get_permalink($next_post->ID)."'> << ".get_the_title($next_post->ID)."</a></div>";
}

//$pagination = "<a href='javascript:history.back()'>zurück</a> >";

return '<div class="objektpagination">'.$next_pagination;

}
add_shortcode( 'paginationprev', 'paginationprev' );

### Child Navigation ###
// Add Pagination Shortcode
function paginationnext() {
//$next_post = wpv_child(1, 'projekt', 'objekt');
$previous_post = wpv_child(-1, 'projekt', 'objekt');
$prev_pagination= '';
//$next_pagination = '';

if($previous_post){
$prev_pagination = "<div class='nextnav'><a href='".get_permalink($previous_post->ID)."'> ".get_the_title($previous_post->ID)." >> </a></div>";
}

//$pagination = "<a href='javascript:history.back()'>zurück</a> >";

return $prev_pagination.'</div>';

}
add_shortcode( 'paginationnext', 'paginationnext' );

function wpv_child($step, $parentslug, $childslug) {
global $post;
$parent = get_post_meta($post->ID, '_wpcf_belongs_' . $parentslug
. '_id', true);
$children = get_posts(array('post_type' => $childslug, 'meta_key' => '_wpcf_belongs_' . $parentslug . '_id', 'meta_value' => $parent, 'numberposts' => -1));
$i = 0;
foreach ($children as $i => $child) {
if ($child->ID == $post->ID) break;
}
$i += $step;
if (isset($children[$i])) return $children[$i];
}
/code>

can you help me again?

thx and best regards - alex

New threads created by Christian Cox and linked to this one are listed below:

https://toolset.com/forums/topic/previous-next-within-parent-child-relationship/