AJAX paging breaks badly when json_encode can't encode

[westi]

If json_encode can't encode a response for some reason you get no feedback at all except for a blank list.

This seems most likely to trigger with invalid UTF8 sequences in spam comments.

With non-ajax paging you at least get all the comments displayed even if you do get a lot of ??? for the bad chars

Example Error seen:

[15-Dec-2010 14:18:38] Warning: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument in /home/wpdev/public_html/wp-admin/includes/class-wp-list-table.php on line 839 [

[filosofo]

This is one reason I proposed a standard way of doing Ajax in #14618: it handles erroneous or syntactically invalid responses in a consistent manner.

In this case we could pass the href attribute value to the error handler and have it set location.href to load the requested page when Ajax paging fails.

[SergeyBiryukov]

We can strip invalid characters with wp_check_invalid_utf8(). Patch included.

[SergeyBiryukov]

Related: #11175

[MikeHansenMe]

Refreshed

[pento]

Duplicate of #28786.