将子菜单添加到Wordpress主题

Question

I want to add a submenu of a wordpress menu into my theme. I want to use the wp_nav_menu function of Wordpress 3.0. And in other words, I want to see the submenu not the subpages which means that wp_list_pages is not the right function because I want the submenu and not the subpages.

Let's assume the menu structure looks like that:

• Home
• Entry1
  • Entry3
  • Entry4
• Entry2
  • Entry5
  • Entry6

I want that if someone clicks on Entry1 (and makes it the parent) the Theme just shows the submenu of this entry. In the case of Entry1 it's:

• Entry3
• Entry4

I know that there is a code like that:

<?php 
    $children = ($post->post_parent) ? wp_list_pages('title_li=&child_of='.$post->post_parent.'&echo=0') : wp_list_pages('title_li=&child_of='.$post->ID.'&echo=0'); 
    if($children) { echo('<ul>'.$children.'</ul>'); } 
 ?> 

However, the point is that I'm talking about the menu structure and not the page structure. Oh, and the depth parameter does not work because it means to here and not from here.

I think there could be a solution with a custom walker but I don't know how to implement that.

Function reference for wp_nav_menu http://codex.wordpress.org/Template_Tags/wp_nav_menu

I'm looking for a solution for this problem for so long so please help me. Thanks a lot.

Answer 1

一种解决方案是在页面上放置另一个wp_nav_menu函数并修改css以隐藏非活动菜单项。

Answer 2

In order to get this to work I had to hide the .sub-menu as soon as the page loaded. Then, show only the relevant sub-menu by targeting ".current_page_item .sub-menu"

$(document).ready(function() {
        $(".sub-menu").hide(); // hide the submenu on page load
    $(".current_page_item .sub-menu").show();
)};

Answer 3

This should help: From http://www.svennerberg.com/2009/02/creating-a-submenu-in-wordpress/

<?php
$has_subpages = false;
// Check to see if the current page has any subpages
$children = wp_list_pages('&child_of='.$post->ID.'&echo=0');
if($children) {
    $has_subpages = true;
}
// Reseting $children
$children = "";

// Fetching the right thing depending on if we're on a subpage or on a parent page (that has subpages)
if(is_page() && $post->post_parent) {
    // This is a subpage
    $children = wp_list_pages("title_li=&include=".$post->post_parent ."&echo=0");
    $children .= wp_list_pages("title_li=&child_of=".$post->post_parent ."&echo=0");
} else if($has_subpages) {
    // This is a parent page that have subpages
    $children = wp_list_pages("title_li=&include=".$post->ID ."&echo=0");
    $children .= wp_list_pages("title_li=&child_of=".$post->ID ."&echo=0");
}
?>
<?php // Check to see if we have anything to output ?>
<?php if ($children) { ?>
<ul class="submenu">
    <?php echo $children; ?>
</ul>
<?php } ?>