I would like to set (update) the TextField’s value to TextArea’s text length but nothing happens while i’m typing in the TextArea just a 0 value appears in the TextField when i hit the first key in TextArea.
It’s unintuitive, but TextChangeEvents don’t actually change the server-side value of the text area or text field. Listen for ValueChangeEvents instead, or, if you need the more real-time interaction that TextChangeEvents provide, use the getText() method on the event.