Thank you both for your help!
@Marcus Green this is exactly what I was looking for. But I still have one issue… the Editor API required the ID of the textarea (obviously) but I'm using repeat_elements to have multiple textarea, depending of the user's needs. Any idea how to combine both APIs and get this working?
@Marcus Green this is exactly what I was looking for. But I still have one issue… the Editor API required the ID of the textarea (obviously) but I'm using repeat_elements to have multiple textarea, depending of the user's needs. Any idea how to combine both APIs and get this working?