用Wordpress Walker包装父母及其子女

Question

在使用Walker和wp_list_pages时，是否可以将父元素和其子元素封装在另一个元素中，这样我就可以将它们作为块来操作了吗？

目前我正在使用代码

class My_Walker extends Walker {
  var $db_fields = array(
    'parent' => 'post_parent',
    'id' => 'ID',
  );

  public function start_lvl( &$output, $depth = 0, $args = array() ) {
    $output .= "<nav class=\"list\">\n";
  }

  public function end_lvl( &$output, $depth = 0, $args = array() ) {
    $output .= "</nav>\n";
  }

  public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    $class = 'list-item';
    if ( $args['has_children'] ) {
      $class ='list-title-item';
    }

    $output .= "<a href=\"#$item->ID\" class=\"$class\">$item->post_title</a>\n";
  }
}

产

<a href="#116" class="list-title-item">Parent 1</a>
<nav class="list">
  <a href="#118" class="list-item">Child 1.1</a>
  <a href="#120" class="list-item">Child 1.2</a>
  <a href="#122" class="list-item">Child 1.3</a>
</nav>
<a href="#125" class="list-title-item">Parent 2</a>
<nav class="list">
  <a href="#127" class="list-item">Child 2.1</a>
  <a href="#132" class="list-item">Child 2.2</a>
</nav>

我想得到的是

<div id="title-116" class="list-title">
  <a href="#116" class="list-title-item">Parent 1</a>
  <nav class="list">
    <a href="#118" class="list-item">Child 1.1</a>
    <a href="#120" class="list-item">Child 1.2</a>
    <a href="#122" class="list-item">Child 1.3</a>
  </nav>
</div>
<div id="title-125" class="list-title">
  <a href="#125" class="list-title-item">Parent 2</a>
  <nav class="list">
    <a href="#127" class="list-item">Child 2.1</a>
    <a href="#132" class="list-item">Child 2.2</a>
  </nav>
</div>

我用代码给wp_list_pages打电话

wp_list_pages( array(
  'child_of' => $page_id,
  'post_status' => 'publish',
  'order' => 'asc',
  'depth' => 2,
  'walker' => new My_Walker,
) );

Answer 1

尝试将<div>添加到start_el和end_el方法中，仅用于顶级项。(即深度= 0)

public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    $class = 'list-item';
    if ( $args['has_children'] ) {
      $class ='list-title-item';
    }

    $divopen = '';
    if (0 === $depth) {
        $divopen = "<div id=\"title-{$item->ID}\" class=\"list-title\">";
    }

    $output .= "$divopen\r\n<a href=\"#$item->ID\" class=\"$class\">$item->post_title</a>\n";
}

public function end_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    ...
    // Whatever else output is, plus:
    if (0 === $depth) {   
        $output .= "</div>";
    }
}