Currently I’m using
<?php wp_list_pages( 'post_type=region&title_li=' ); ?>
To get the hierarchical list of my custom posts ‘region’.
It works perfectly. I got this :
- Europe
- Belgium
- France
- Asia
- China
With a link on each item.
BUT some pages have no content. It’s just there to create the hierarchy.
In this example, ASIA has no content.
So I’d like a way to create this menu list but if the page has no content -> no link for this element.
So I suppose, I need to use another way than wp_list_pages. But which one ?
Can you help me ?
Thank you !
1 Answer
wp_list_pages() uses a walker named Walker_Page to render its output and this can be overridden.
Below is a customized version of Walker_Page::start_el(). The code was first copied from the core, then a simple check was added before outputting the link. If a post does not have any content, then the title is wrapped in a <span> tag rather than an <a>.
Here, the modification is highlighted:
...
// Modification: If a posts content is empty, do not link the item. Instead use a span tag to wrap the text.
$maybe_link_item = empty( $page->post_content ) ? '<li class="https://wordpress.stackexchange.com/questions/265709/%s"><span class="no-link">%3$s%4$s%5$s</span>' : '<li class="https://wordpress.stackexchange.com/questions/265709/%s"><a href="https://wordpress.stackexchange.com/questions/265709/%s">%s%s%s</a>';
$output .= $indent . sprintf(
$maybe_link_item, // Modification: Using this variable instead of '<li class="https://wordpress.stackexchange.com/questions/265709/%s"><a href="https://wordpress.stackexchange.com/questions/265709/%s">%s%s%s</a>'
$css_classes,
get_permalink( $page->ID ),
$args['link_before'],
/** This filter is documented in wp-includes/post-template.php */
apply_filters( 'the_title', $page->post_title, $page->ID ),
$args['link_after']
);
...
Here is the full walker:
class WPSE_Walker_Page extends Walker_Page {
// Copied from Walker_Page::start_el() core version v4.7.4.
/**
* Outputs the beginning of the current element in the tree.
*
* @see Walker::start_el()
* @since 2.1.0
* @access public
*
* @param string $output Used to append additional content. Passed by reference.
* @param WP_Post $page Page data object.
* @param int $depth Optional. Depth of page. Used for padding. Default 0.
* @param array $args Optional. Array of arguments. Default empty array.
* @param int $current_page Optional. Page ID. Default 0.
*/
public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t="";
$n = '';
}
if ( $depth ) {
$indent = str_repeat( $t, $depth );
} else {
$indent="";
}
$css_class = array( 'page_item', 'page-item-' . $page->ID );
if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
$css_class[] = 'page_item_has_children';
}
if ( ! empty( $current_page ) ) {
$_current_page = get_post( $current_page );
if ( $_current_page && in_array( $page->ID, $_current_page->ancestors ) ) {
$css_class[] = 'current_page_ancestor';
}
if ( $page->ID == $current_page ) {
$css_class[] = 'current_page_item';
} elseif ( $_current_page && $page->ID == $_current_page->post_parent ) {
$css_class[] = 'current_page_parent';
}
} elseif ( $page->ID == get_option('page_for_posts') ) {
$css_class[] = 'current_page_parent';
}
/**
* Filters the list of CSS classes to include with each page item in the list.
*
* @since 2.8.0
*
* @see wp_list_pages()
*
* @param array $css_class An array of CSS classes to be applied
* to each list item.
* @param WP_Post $page Page data object.
* @param int $depth Depth of page, used for padding.
* @param array $args An array of arguments.
* @param int $current_page ID of the current page.
*/
$css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) );
if ( '' === $page->post_title ) {
/* translators: %d: ID of a post */
$page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );
}
$args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before'];
$args['link_after'] = empty( $args['link_after'] ) ? '' : $args['link_after'];
// Modification: If a posts content is empty, do not link the item. Instead use a span tag to wrap the text.
$maybe_link_item = empty( $page->post_content ) ? '<li class="https://wordpress.stackexchange.com/questions/265709/%s"><span class="no-link">%3$s%4$s%5$s</span>' : '<li class="https://wordpress.stackexchange.com/questions/265709/%s"><a href="https://wordpress.stackexchange.com/questions/265709/%s">%s%s%s</a>';
$output .= $indent . sprintf(
$maybe_link_item, // Modification: Using this variable instead of '<li class="https://wordpress.stackexchange.com/questions/265709/%s"><a href="https://wordpress.stackexchange.com/questions/265709/%s">%s%s%s</a>'
$css_classes,
get_permalink( $page->ID ),
$args['link_before'],
/** This filter is documented in wp-includes/post-template.php */
apply_filters( 'the_title', $page->post_title, $page->ID ),
$args['link_after']
);
if ( ! empty( $args['show_date'] ) ) {
if ( 'modified' == $args['show_date'] ) {
$time = $page->post_modified;
} else {
$time = $page->post_date;
}
$date_format = empty( $args['date_format'] ) ? '' : $args['date_format'];
$output .= " " . mysql2date( $date_format, $time );
}
}
}
To use the new walker, add it to your theme’s functions.php or to a plugin, then modify the call to wp_list_pages() so that it uses our new custom walker:
wp_list_pages( [
'post_type' => 'region',
'walker' => new WPSE_Walker_Page(),
'title_li' => '',
] );