I’m not sure if this should be properly labeled a bug, feature, or change request, but my testing so far indicates that ACF WYSIWYG fields completely break (as in the WYSIWYG editor never loads in the ACF admin backend) if the default editor in WP is changed from tinyMCE to anything else. In looking at the ACF code, this seems to stem from a lkess than ideal apporach of looking for and targeting tinyMCE field directly.
Within the ACF code (acf-input.min.js)
the problem arises with the call to and use of the function:
initalize_tinymce()
Yet WP provides a way to call/initialize the “default” editor (since version 3.3), whatever the site admins may decide that should be:
wp_editor() – https://codex.wordpress.org/Function_Reference/wp_editor
I think if you updated your initialization code to use the WP core feature, instead of the hard-coded reliance on tinyMCE, this would fix multiple problems folks have run in to:
https://support.advancedcustomfields.com/forums/topic/wysiwyg-editor-not-appearing-in-edit-page/
https://support.advancedcustomfields.com/forums/users/btaylor/replies/
https://support.advancedcustomfields.com/forums/topic/toolbar-tinymce-not-showing-on-4-1-8-1/
I did notice one note in the changelog for ACF Pro 5.5.13 (https://www.advancedcustomfields.com/blog/acf-pro-5-5-13-update/)
“WYSIWYG field: Fixed JS error when using CKEditor plugin”
But I just tested with ACF Pro 5.6.8, and am still getting error whenever I try to set my WP default WYSIWYG to CKEditor, and then load any page that includes an ACF WYSIWYG field:
acf-input.min.js?ver=5.6.8:3
Uncaught TypeError: Cannot read property ‘acf_content’ of undefined
at Object.defaults (acf-input.min.js?ver=5.6.8:3)
at Object.initialize_tinymce (acf-input.min.js?ver=5.6.8:3)
at Object.initialize (acf-input.min.js?ver=5.6.8:3)
at Object.initialize (acf-input.min.js?ver=5.6.8:3)
at acf-input.min.js?ver=5.6.8:1
at d (acf-input.min.js?ver=5.6.8:1)
at Object.i (acf-input.min.js?ver=5.6.8:1)
at Object.do_action (acf-input.min.js?ver=5.6.8:1)
at Object._load_field (acf-input.min.js?ver=5.6.8:1)
at d (acf-input.min.js?ver=5.6.8:1)
