Joe Ponzio

The New Nine Menus Manager adds a section to the ‘Appearance -> Menus’ section of your dashboard so you can quickly and easily create and delete menu locations on the fly.
Why? Because we’re tired of jumping back and forth between our functions file and the dashboard. Because we’re tired of writing <code>register_nav_menu</code> over and over again every time we start a new site.
And because there seems to be a disconnect here – just about every site needs to have a navigation menu, there are no configuration options for <code>register_nav_menu</code>, and it just seems to make sense to be able to create and delete menu locations in the dashboard.
This plugin was built by <a href="http://www.newnine.com/" title="New Nine Media & Advertising" rel="nofollow ugc">New Nine Media & Advertising</a>.
Single Site & Network Compatible
The New Nine Menus Manager works on both individual sites and WordPress Networks.
MU Compatible
The plugin is also Must Use compatible for both single sites and network installations.

New Nine Menus Manager

Register new menu locations right from the menu screen. Never write register_nav_menu again and keep your functions file clean!

jojoee

By default wordpress menu system, wordpress can only automatically add/remove top-level page to/from menus
<ul>
<li>When publish top-level page then add it into menus</li>
<li>When move top-level page to trash then remove it from menus</li>
<li>When restore top-level page then add it into menus</li>
</ul>
this feature has no effect with subpage (child page), but Auto Subpage Menu can
<ul>
<li>When publish subpage (child page) then add it into menus (if its page parent exists in menu)</li>
<li>When update subpage (child page) then update menus</li>
<li>When move subpage (child page) to trash then remove it from menus</li>
<li>When restore subpage (child page) then add it into menus</li>
</ul>
<h3>Notes</h3>
<ul>
<li><a href="https://codex.wordpress.org/WordPress_Coding_Standards" rel="nofollow ugc">WordPress Coding Standards</a></li>
<li><a href="http://www.phpdoc.org/" rel="nofollow ugc">phpDocumentor</a> DocBlock Standard</li>
<li><a href="https://wordpress.org/plugins/auto-subpage-menu/" rel="ugc">Auto Subpage Menu</a> – WordPress Directory Uri</li>
<li>2 spaces for indent</li>
<li><a href="https://github.com/jojoee/auto-subpage-menu" rel="nofollow ugc">Repository on Github</a></li>
</ul>
<h3>TODO</h3>
<ul>
<li>[ ] Implement DocBlock to all</li>
<li>[ ] Automatically update child-page when its parent have been move, suggested by <a href="https://wordpress.org/support/profile/ncwebdev" rel="ugc">ncwebdev</a>, <a href="https://wordpress.org/support/topic/menu-link-doesnt-work-properly-when-moving-a-page" rel="ugc">topic</a></li>
<li>[ ] Add other versions into wordpress download page</li>
</ul>

Auto Subpage Menu

The idea is good but the support is not very good. So if you find another plug-in with similar functionality I would advise to try that!

Good idea but bad support

By default wordpress menu system, wordpress can only automatically add/remove top-level page to/from menus

New Nine Menus Manager vs Auto Subpage Menu