WooCommerce - Show next\prev products from current product category (when viewing a single product) 1. If product is last -> Next product is first 2. If product is first -> Prev product is last forked from https://gist.github.com/2176823 (This question was in http://stackoverflow.com/questions/13597687/woocommerce-get-next-previous-product/13612387

content-single-product.php

<?php
// get next and prev products
// Author: Georgy Bunin ([email protected])
// forked from https://gist.github.com/2176823

function ShowLinkToProduct($post_id, $categories_as_array, $label) {
    // get post according post id
    $query_args = array( 'post__in' => array($post_id), 'posts_per_page' => 1, 'post_status' => 'publish', 'post_type' => 'product', 'tax_query' => array(
        array(
            'taxonomy' => 'product_cat',
            'field' => 'id',
            'terms' => $categories_as_array
        )));
    $r_single = new WP_Query($query_args);
    if ($r_single->have_posts()) {
        $r_single->the_post();
        global $product;
    ?>
    <ul class="product_list_widget">
        <li><a href="<?php the_permalink() ?>" title="<?php echo esc_attr(get_the_title() ? get_the_title() : get_the_ID()); ?>">
            <?php if (has_post_thumbnail()) the_post_thumbnail('shop_thumbnail'); else echo '<img src="'. woocommerce_placeholder_img_src() .'" alt="Placeholder" width="'.$woocommerce->get_image_size('shop_thumbnail_image_width').'" height="'.$woocommerce->get_image_size('shop_thumbnail_image_height').'" />'; ?>
            <?php echo $label; ?>
            <?php if ( get_the_title() ) the_title(); else the_ID(); ?>
        </a> <?php echo $product->get_price_html(); ?></li>
    </ul>
    <?php
        wp_reset_query();
    }
}

if ( is_singular('product') ) {
    global $post;

    // get categories
    $terms = wp_get_post_terms( $post->ID, 'product_cat' );
    foreach ( $terms as $term ) $cats_array[] = $term->term_id;

    // get all posts in current categories
    $query_args = array('posts_per_page' => -1, 'post_status' => 'publish', 'post_type' => 'product', 'tax_query' => array(
        array(
            'taxonomy' => 'product_cat',
            'field' => 'id',
            'terms' => $cats_array
        )));
    $r = new WP_Query($query_args);

    // show next and prev only if we have 3 or more
    if ($r->post_count > 2) {

        $prev_product_id = -1;
        $next_product_id = -1;

        $found_product = false;
        $i = 0;

        $current_product_index = $i;
        $current_product_id = get_the_ID();

        if ($r->have_posts()) {
            while ($r->have_posts()) {
                $r->the_post();
                $current_id = get_the_ID();

                if ($current_id == $current_product_id) {
                    $found_product = true;
                    $current_product_index = $i;
                }

                $is_first = ($current_product_index == $first_product_index);

                if ($is_first) {
                    $prev_product_id = get_the_ID(); // if product is first then 'prev' = last product
                } else {
                    if (!$found_product && $current_id != $current_product_id) {
                        $prev_product_id = get_the_ID();
                    }
                }

                if ($i == 0) { // if product is last then 'next' = first product
                    $next_product_id = get_the_ID();
                }

                if ($found_product && $i == $current_product_index + 1) {
                    $next_product_id = get_the_ID();
                }

                $i++;
            }

            if ($prev_product_id != -1) { ShowLinkToProduct($prev_product_id, $cats_array, "next: "); }
            if ($next_product_id != -1) { ShowLinkToProduct($next_product_id, $cats_array, "prev: "); }
        }

        wp_reset_query();
    }
}
?>

Is there a way to make this work when the products have been sorted manually? Thanks for any hint!

first_product_index is not defined, I get a php warning for that.

@Sternberg - you can manual order your products with $query_args
@CapitalH - Ou... you totaly right. $first_product_index is never used.

You can check first_product_index like

if ($i == $r->post_count - 1) { $first_product_index = $i; }

See more in WP Query Properties

The idea is to check if

$i == 0                                 => first product
$i == $r->post_count       => last product

Great work georgybu.

I got it to work without any problems but I am hoping you can help me add a class to the "next group" as I want that to float right while "prev group" stays to the left.

Appreciate any help you can provide.

Thanks

Hi Georgi!
I'm using your code and it works very well. Thank you!
I wish to know if is possible and how to do, to sort products by tags and by slug or title.
Could you help, please?

Thanks

how the next and previous buttons will appear in single product page?

Superb!! Just what I was looking for, excellent work mate. Works like a charm.

this works fine as long as a product is in one single category. if prod A is in cat A and cat B the next button sends me to a prod in the last categ, for this example cat B.... can you help me solve this issue? I've searched everywhere and I can't find anything.
thanks!

@lexthor Did you ever solve this issue yourself with products in multiple categories?

@georgybu Hello, very good job, I just want to know if you can do that only with the sub categories of a product?