Menu walker with levels WordPress

Dbranes comments:

the plugin allows you to use "level" in the wp_nav_menu

for example:

Show level 0 only with depth 1:
<?php
echo wp_nav_menu( array(
'level' => 0,
'depth' => 1
));
?>


Show level 1 only with depth 1:
<?php
wp_nav_menu( array(
'level' => 1,
'depth' => 1
));
?>


and so on.

Yavor Trampov comments:

Dbranes,

thanks for the recomendatio. This seems to be what I need, but I can't get it to work. I have a test install of WordPress where I try all the plugins before I use them on any development installation - kind of trying to save time debugging. Once installed, this plugin breaks my menus and the site in general ("Fatal error: Call to undefined method stdClass::setChildren() in /Volumes/ahorn-design work/Ahorn Design/0010AD_WP_Playground/WebDev/wp-content/plugins/codepress-menu/codepress-menu.php on line 43"). It's just a basic 20/11 theme, so it's not really supposed to break.

Dbranes comments:

hmm... I also installed this plugin on my test machine with TwentyEleven theme and it runs smoothly

I'm using php 5.3.8.

Dbranes comments:

Here is another approach:

Activate the <strong>Advanced menu widget</strong> plugin

[[LINK href="http://wordpress.org/extend/plugins/advanced-menu-widget/screenshots/"]]http://wordpress.org/extend/plugins/advanced-menu-widget/screenshots/[[/LINK]]

Then you get access to the following options in wp_menu_nav :


$menu_args= array(
'fallback_cb' => '',
'menu' => "main_menu", // Select menu
'walker' => new Related_Sub_Items_Walker(), // Walker class
'depth' => 0, // How many levels to display: 0 unlimited depth, 1 level deep, 2 level deep, 3 level deep, ...
'only_related' => 0, // Show hierarchy: 0 display all, 1 only related sub-items
'strict_sub' => 0, // Show only strictly related sub-items: 0 or 1 (then only_related has to be 1)
'filter' => 0, // Filter selection: 0 None, 1 Display direct path, 2 Display only children of selected item
'include_parent' => 0, // Include parents, 0 no, 1 yes
'filter_selection' => '', // Filter selection: page titles
'container' => 'div', // Container: Whether to wrap the ul, and what to wrap it with.
'container_id' => '', // Container ID: The ID that is applied to the container.
'menu_class' => 'menu', // Menu Class: CSS class to use for the ul element which forms the menu.
'before' => '', // Before the link: Output text before the <a> of the link.
'after' => '', // After the link: Output text after the <a> of the link.
'link_before' => '', // Before the link text: Output text before the link text.
'link_after' => '', // After the link text: Output text after the link text.
'start_depth' => 0 // Starting depth levels 0,1,2,...
);

wp_nav_menu($menu_args);


I constructed the above options + comments from the Widget source code:

[[LINK href="http://plugins.svn.wordpress.org/advanced-menu-widget/trunk/advanced-menu-widget.php"]]http://plugins.svn.wordpress.org/advanced-menu-widget/trunk/advanced-menu-widget.php[[/LINK]]

This Walker seems to be very powerful.

One way to use it, is to play with the widget to find out the correct parameters for the $menu_args array above.

Dbranes comments:

By playing with the parameters, the following code seems to display the current branches for level 1, 2 and 3:


// current branch - level 1
echo "current branch - level 1";
$menu_args= array(
'menu' => "main_menu", // Select menu
'walker' => new Related_Sub_Items_Walker(), // Walker class
'depth' => 1, // How many levels to display: 0 unlimited depth, 1 level deep, 2 level deep, 3 level deep, ...
'menu_class' => 'section-level1', // Menu Class: CSS class to use for the ul element which forms the menu.
);
wp_nav_menu($menu_args);

// current branch - level 2
echo "current branch - level 2";
$menu_args= array(
'menu' => "main_menu", // Select menu
'walker' => new Related_Sub_Items_Walker(), // Walker class
'only_related' => 1, // Show hierarchy: 0 display all, 1 only related sub-items
'depth' => 2, // How many levels to display: 0 unlimited depth, 1 level deep, 2 level deep, 3 level deep, ...
'start_depth' => 1, // Starting depth levels 0,1,2,...
'menu_class' => 'section-level2', // Menu Class: CSS class to use for the ul element which forms the menu.
);
wp_nav_menu($menu_args);


// current branch - level 3
echo "current branch - level 3";
$menu_args= array(
'menu' => "main_menu", // Select menu
'walker' => new Related_Sub_Items_Walker(), // Walker class
'only_related' => 1, // Show hierarchy: 0 display all, 1 only related sub-items
'start_depth' => 2, // Starting depth levels 0,1,2,...
'depth' => 3, // How many levels to display: 0 unlimited depth, 1 level deep, 2 level deep, 3 level deep, ...
'menu_class' => 'section-level3', // Menu Class: CSS class to use for the ul element which forms the menu.
);
wp_nav_menu($menu_args);


where the current css-selectors are given by "current-menu-ancestor" and "current-menu-item".

Yavor Trampov comments:

Branes, thanks for this. We managed to get the sitepress solution from your first answer running. I also saw the advanced menu widget during my research and the info you gathered from the source-code - the arguments needed to use the plugin with PHP rather than just as a widget - is really valuable. Thanks for this! Cheers!