How to show typing indicator in Reactjs

Question

Hi I a chat application in Reactjsand Redux. Currently I am not using any database, I am storing all the users in my redux store. I am sending the message and receiving the message using xmpp stanza.js. Now I want to show a typing indicator in my chat application. I don't have any idea how to implement that thing. You can imagine, I have simply a list of users in my Redux .These users have some property

Users={
  Id:123,
  LastMessagebody:"hii",
  Messagread:true,
  MessageAt:12:40Pm
  From:56
}