How to change dropdown menu depth and order using filters

With the 1.5.8 release, I added dropdown_menu_defaults filter to the dropdown menu widget, so anyone can edit dropdown menu defaults so easily. Here in this post I will show you how to change depth and page order using this filter.

First open functions.php in your theme folder and add those lines:

function my_dropdown_defaults($menu){
  // Change settings here
  return $menu; // return the variable array back
} add_filter( 'dropdown_menu_defaults', 'my_dropdown_defaults' );

This is the basic structure of a filter. We attach this filter to a tag called dropdown_menu_defaults so whenever this filter is called our function will run.

Next step we will change depth of menu. By default, depth is 4, here i will limit it to 2, so that only one level dropdown will show up. We can do it easily adding this line

function my_dropdown_defaults($menu){
  // Change settings here
  $menu['depth'] = 2;
  return $menu; // return the variable array back
} add_filter( 'dropdown_menu_defaults', 'my_dropdown_defaults' );

Now let’s change order of the pages on the menu. Dropdown menu widget uses wp_list_pages defaults to list your pages. So any setting you see on the codex page is acceptable for the dropdown. Let’s sort pages by IDs:

function my_dropdown_defaults($menu){
  // Change settings here
  $menu['depth'] = 2;
  $menu['sort_column'] = 'ID';
  return $menu; // return the variable array back
} add_filter( 'dropdown_menu_defaults', 'my_dropdown_defaults' );

Now whenever a dropdown is generated this function will set depth to 2 and change sort column to page ids.

Please note that this example is given for pages menus. For category dropdowns you need to use wp_list_categories defaults and for wp3 custom menus you have to use wp_nav_menu defaults. Generally defaults like order, depth, and sort_column remain same, but you may find differences between arguments.

Btw. I also added a dropdown menu themes page so you can view all themes without switching anything. Check them out here.

Cheers.

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