Hi !
After an half day of research, we found a solution for preview with ACF (and all custom fields in WP).
The problem :
If you change an ACF value (or any wp custom fields) but not the title, the content or other native fields, the post (or page) doesn’t change for WP…
And when you press the preview button, if there is an autosave, WP delete it because the autosave and the saved post (or page) are the same (title, content,… haven’t change).
I don’t know why WP do that like that but we have the solution (put this code on your function.php file):
/*
Debug preview with custom fields
*/
add_filter('_wp_post_revision_fields', 'add_field_debug_preview');
function add_field_debug_preview($fields){
$fields["debug_preview"] = "debug_preview";
return $fields;
}
add_action( 'edit_form_after_title', 'add_input_debug_preview' );
function add_input_debug_preview() {
echo '<input type="hidden" name="debug_preview" value="debug_preview">';
}
The first hook add a field to check for revisions (debug_preview).
And the second add an hidden field (debug_preview) on edit pages with a value (‘debug_preview’ but any value works).
When WP check for revision, the field ‘debug_preview’ doesn’t exist in database but exist with a value in the edit page, so it’s different and WP make the autosave.
Say “hello back” to preview in WP 🙂
I hope this code can help you !
Elliot, if you can add this fix in ACF, it will be great 🙂
Have a nice day !
