Unable to add menu items to menus

[butterflymedia]

Unable to add posts/pages to custom menus using Twenty Fourteen. No console error is received.

When clicking on Add to menu, nothing happens.

[Ipstenu]

This is not just Twenty Fourteen. Tested on Twenty Thirteen and Genesis, same results. Editing title.

The text changed from "Add menu items from the column on the left." to "Drag each item into the order you prefer. Click the arrow on the right of the item to reveal additional configuration options." but there's no menu box.

Tried pages, posts, categories, links, and all the same result.

[helen]

Presuming that this is caused by the report in #26058?

[jeremyfelt]

#26058 was marked as a duplicate.

[jeremyfelt]

After [26163] for #25953, I see an undefined index 'menu-item' on line 902 of wp-admin/includes/ajax-actions.php when adding nav menu items.

If I disable WP_DEBUG, I get the same behavior described in this ticket description.

[jeremyfelt]

Looks to be ​line 169 in nav-menu.js.

Old: re = new RegExp('menu-item\\[(\[^\\]\]*)');

New: re = /menu-item\[([^]\]*)/;

[senlin]

I actually get the error/notice on line 907 of wp-admin/includes/ajax-actions.php:

Notice: Undefined index: menu-item in /path/wp-admin/includes/ajax-actions.php on line 907

[jeremyfelt]

@senlin - That's appearing because the ajax call from nav-menu.js is not passing the data for $_POST['menu-item'] that is expected in ajax-actions.php.

And yep.. I mistyped earlier. Line 907 is throwing the error. :)

[senlin]

I can confirm that before [26163] adding nav menu items works

[jeremyfelt]

The replacement Regex was slightly off. 26047.diff​ contains the correct version.

​Props to @rzen for the fix.

[SergeyBiryukov]

In 26233:

Fix replacement regex in wp-admin/js/nav-menu.js.

props rzen, jeremyfelt.
fixes #26047.