In this third installment in the upgrade to wp_nav_menu() series of posts, I will be dealing with moving from wp_list_categories() to wp_nav_menu().
Let’s start with the same basic outline and list the default options for each function. We will start with wp_nav_menu() 1 first:
wp_nav_menu( array( 'menu' => '', 'container' => 'div', 'container_class' => '', 'container_id' => '', 'menu_class' => 'menu', 'menu_id' => '', 'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '', 'depth' => 0, 'walker' => '', 'theme_location' => '' ) );
We follow with wp_list_categories() 2, 3 which is often wrapped in a <ul class=”menu”> tag:
<ul class="menu">
wp_list_categories( array( 'include' => '', 'exclude' => '', 'exclude_tree' => '', 'child_of' => 0, 'hide_empty' => 1, 'orderby' => 'name', 'order' => 'ASC', 'use_desc_for_title'=> 1, 'number' => NULL, 'hierarchical' => true, 'show_count' => 0, 'pad_counts' => 0, 'style' => 'list', /* 'style' set to list "creates list items for an unordered list" */ 'show_option_all' => '', 'show_option_none' => __('No categories'), 'show_last_update' => 0, 'feed' => '', 'feed_type' => '', 'feed_image' => '', 'current_category' => 0, 'taxonomy' => 'category', 'title_li' => __( '' ), /* 'title_li' set to '' for menus from the default 'Categories' */ 'echo' => 1, 'depth' => 0, 'walker' => 'Walker_Category' ) );
</ul>
Here is the break-down of the wp_list_categories() default options from above:
'include' – not used'exclude' – not used'exclude_tree' – not used'child_of' – not used'hide_empty' – not used'orderby' – not used'order' – not used'use_desc_for_title' – not used'number' – not used'hierarchical' – not used'show_count' – not used'pad_counts' – not used'style' – not used'show_option_all' – not available'show_option_none' – not available'show_last_update' – not available'feed' – not available'feed_type' – not available'feed_image' – not available'current_category' – not available'taxonomy' – not available'title_li' – not used'echo' – similar to wp_nav_menu(); true versus 1 as value'depth' – same as wp_nav_menu()'walker' – see below for additional notes
Although there are great many options available to be used with wp_list_categoires() most are not used (as noted in the list above) in place of the user interface of wp_nav_menu() found under Appearance | Menu in the dashboard. The options that are marked as “not available” are currently not directly supported by wp_nav_menu() without the application of filters. The last few options remaining match up almost exactly with wp_page_nav() in a similar fashion as was shown with wp_list_pages().
Just like the wp_list_pages() consideration, the wp_nav_menu() fallback_cb option may be set to 'fallback_cb' => 'wp_list_categories'. This backward compatibility may also be addressed with a custom function as was noted, too.
Note: In most cases you would leave the wp_nav_menu() 'walker' option set to its default NULL although wp_list_categories() uses its own default walker class.
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