[Resolved] Custom field – File – File type restriction

[Author]

Posts

[Jean-Philippe]

Hi, is there a way to restrict a custom field file to only allow .pdf?

Thanks

[Christian Cox]

Hello, there is no built-in way to limit the file types accepted by a file field, but if the posts are created with Forms you can use the Forms validation API to enforce specific file type(s). We have some information about this in several places:
https://toolset.com/errata/a-note-on-using-the-cred_form_ajax_upload_validate-hook/
https://toolset.com/documentation/programmer-reference/cred-api/#cred_form_ajax_upload_validate

...and in various other tickets in the forum. This approach only works when posts are created with Forms and the Media Library is used to handle media uploads in that Form.

Let me know if you have questions about implementing this API and I can take a closer look.

[Jean-Philippe]

So there is no way presently to limit the file type directly in the wordpress backend? We don't use Forms

[Christian Cox]

Yes, that is correct. The only public field content validation APIs provided by Toolset are for validating Forms submissions, not uploads in wp-admin.