Detecting if the chatbox/chat field is open.

[Jiroxys7]

You know how UN has that typewriter script? I'm trying to create a script that detects if the chat box is open and the player is typing (anything), and displays an emote to show that the player is typing. though i cant seem to find the functions that detect this. anyone know where i could find a list of functions or whatever that check for these? or if youve found them somewhere in the wiki, could you link me to it?