I want to control value of what use input in WordPress backend, so I need to make action after each field is edited / changed. I did a lot of research but only things I can found is after "saving/updating". I need to check if user is creating some errors and can't wait it's saved. Any idea?
I need a : hook / trigger / action / event Where : backend (post) When : a field is edited / a field is changed / selection is changed (could also work)
I'm using ACF but the question is general to any change in WordPress backend (admin part).
For a comparison I need the equivalent of a C# "onchange" event but for WordPress.