In de kolom rechts naast elke pagina staat de “Navigatie”. Dit blok toont hyperlinks naar de moederpagina, de zusterpagina’s en/of de kinderen van de huidige pagina.

Deze navigatie heb ik geprogrammeerd in PHP, gebruik makend van de WordPress standaardfuncties. De functie is opgenomen in functies.php van het subthema.

De source-code van de functie:

<?php
function display_current_page_menu()
{
  /*  This functions displays a vertical navigation menu for the
      current page, containing:
      - a link to its direct parent (not the grandparents)
      - links to its siblings (pages having the same parent)
      - the title of the current page (not linkable)
      - links to its direct childs (not the grandchilds)

      By Henk Arendse (www.henkarendse.nl); 19-nov-2013.
  */

    global $post;

	$link_format = "<div class='%s'><a href='%s'>%s</a></div>";

    if ($post->post_parent) {
        // current page is sub-page.
        // get its parent page; print a link to the parent.
        $parent = get_post($post->post_parent);

        echo (sprintf($link_format,
                        "spm-parent",   //css class
                        get_page_link( $parent->ID ),
                        $parent->post_title ));

        // get sibling pages
        $siblings = get_pages( array(

                        'hierarchical' => 0,
                        'parent' => $post->post_parent,
                        'sort_column' => 'menu_order',
                        'sort_order' => 'asc' ) );

        // print current page and its siblings
        foreach( $siblings as $sibling ) {
            // skip empty pages
            $content = $sibling->post_content;
            if ( ! $content ) continue;


            if ($sibling->ID == $post->ID) {
                // disply currrent page
                echo ("<div class='spm-current'>"
                        . $post->post_title
                        . "</div>");

                // get childeren of current page
                $children = get_pages( array(
                        'hierarchical' => 0,
                        'parent' => $post->ID,
                        'sort_column' => 'menu_order',
                        'sort_order' => 'asc' ) );

                foreach( $children as $child){
                        // skip empty page
                        $content = $child->post_content;
                        if ( ! $content ) continue;

                        // display link to child
                        echo (sprintf($link_format,
                                    "spm-child", // css class
                                    get_page_link( $child->ID ),
                                    $child->post_title ));
                }  //foreach child
            } else {
                // display link to sibling
                echo (sprintf($link_format,
                        "spm-sibling", // css class
                        get_page_link( $sibling->ID ),
                        $sibling->post_title ));
            }
        }  // foreach sibling
  } else { // current page is not a sub-page.

        // get childeren of current page
        $children = get_pages( array(
                        'hierarchical' => 0,
                        'parent' => $post->ID,
                        'sort_column' => 'menu_order',
                        'sort_order' => 'asc' ) );

        // print the page title of the current page (not linkable)
        // or link to home if no children
        if ($children)
            echo ("<div class='spm-parent'>"
                        . $post->post_title
                        . "</div>");
        else
           echo (sprintf($link_format,
                "spm-parent",   //css class
                home_url(),
                "Home" ));

        foreach( $children as $child){
            // skip empty page
            $content = $child->post_content;
            if ( ! $content ) continue;

            // display link to child
            echo (sprintf($link_format,
                        "spm-sibling", // css class
                        get_page_link( $child->ID ),
                        $child->post_title ));
        } // foreach chilld
    }
}
?>