Woocommerce have next/previous navigation with custom ordering WordPress

Arnav Joy answers:

well I think you have to write custom code for it.

Firoja_Imtosupport answers:

Hello,

In your file yourtheme/functions.php add these functions and make changes in query as you need

function next_post_link_product($format='%link »', $link='%title', $in_same_cat = false, $excluded_categories = '') {
adjacent_post_link_product($format, $link, $in_same_cat, $excluded_categories, false);
}

function previous_post_link_product($format='« %link', $link='%title', $in_same_cat = false, $excluded_categories = '') {
adjacent_post_link_product($format, $link, $in_same_cat, $excluded_categories, true);
}

function adjacent_post_link_product( $format, $link, $in_same_cat = false, $excluded_categories = '', $previous = true ) {
if ( $previous && is_attachment() )
$post = get_post( get_post()->post_parent );
else
$post = get_adjacent_post_product( $in_same_cat, $excluded_categories, $previous );

if ( ! $post ) {
$output = '';
} else {
$title = $post->post_title;

if ( empty( $post->post_title ) )
$title = $previous ? __( 'Previous Post' ) : __( 'Next Post' );

$title = apply_filters( 'the_title', $title, $post->ID );
$date = mysql2date( get_option( 'date_format' ), $post->post_date );
$rel = $previous ? 'prev' : 'next';

$string = '<a href="' . get_permalink( $post ) . '" rel="'.$rel.'">';
$inlink = str_replace( '%title', $title, $link );
$inlink = str_replace( '%date', $date, $inlink );
$inlink = $string . $inlink . '</a>';

$output = str_replace( '%link', $inlink, $format );
}

$adjacent = $previous ? 'previous' : 'next';

echo apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post );
}

function get_adjacent_post_product( $in_same_cat = false, $excluded_categories = '', $previous = true ) {
global $wpdb;

if ( ! $post = get_post() )
return null;

$current_post_date = $post->post_date;

$join = '';
$posts_in_ex_cats_sql = '';
if ( $in_same_cat || ! empty( $excluded_categories ) ) {
$join = " INNER JOIN $wpdb->term_relationships AS tr ON p.ID = tr.object_id INNER JOIN $wpdb->term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id";

if ( $in_same_cat ) {
if ( ! is_object_in_taxonomy( $post->post_type, 'product_cat' ) )
return '';
$cat_array = wp_get_object_terms($post->ID, 'product_cat', array('fields' => 'ids'));
if ( ! $cat_array || is_wp_error( $cat_array ) )
return '';
$join .= " AND tt.taxonomy = 'product_cat' AND tt.term_id IN (" . implode(',', $cat_array) . ")";
}

$posts_in_ex_cats_sql = "AND tt.taxonomy = 'product_cat'";
if ( ! empty( $excluded_categories ) ) {
if ( ! is_array( $excluded_categories ) ) {
// back-compat, $excluded_categories used to be IDs separated by " and "
if ( strpos( $excluded_categories, ' and ' ) !== false ) {
_deprecated_argument( __FUNCTION__, '3.3', sprintf( __( 'Use commas instead of %s to separate excluded categories.' ), "'and'" ) );
$excluded_categories = explode( ' and ', $excluded_categories );
} else {
$excluded_categories = explode( ',', $excluded_categories );
}
}

$excluded_categories = array_map( 'intval', $excluded_categories );

if ( ! empty( $cat_array ) ) {
$excluded_categories = array_diff($excluded_categories, $cat_array);
$posts_in_ex_cats_sql = '';
}

if ( !empty($excluded_categories) ) {
$posts_in_ex_cats_sql = " AND tt.taxonomy = 'product_cat' AND tt.term_id NOT IN (" . implode($excluded_categories, ',') . ')';
}
}
}

$adjacent = $previous ? 'previous' : 'next';
$op = $previous ? '<' : '>';
$order = $previous ? 'DESC' : 'ASC';

$join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_cat, $excluded_categories );
$where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare("WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_cats_sql", $current_post_date, $post->post_type), $in_same_cat, $excluded_categories );
$sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );

$query = "SELECT p.id FROM $wpdb->posts AS p $join $where $sort";
$query_key = 'adjacent_post_' . md5($query);
$result = wp_cache_get($query_key, 'counts');
if ( false !== $result ) {
if ( $result )
$result = get_post( $result );
return $result;
}

$result = $wpdb->get_var( $query );
if ( null === $result )
$result = '';

wp_cache_set($query_key, $result, 'counts');

if ( $result )
$result = get_post( $result );

return $result;
}

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