Chat scroll to bottom when send a message using React

I would like that chat window scrolls down when I send a text.

Actually messages sent don't trigger the scroll, so they are hidden.

Here's an example ( I'm using the chat component of MS Fluent UI for React library )

I have found this post but I'm not able to integrate it ( don't know where is declared the endMessage ) in my case it's value is undefined.

import React from "react";
import { Avatar, Chat, Divider, Input } from "@fluentui/react-northstar";
import { AcceptIcon } from "@fluentui/react-icons-northstar";

const janeAvatar = {
  image: "public/images/avatar/small/ade.jpg",
  status: {
    color: "green",
    icon: <AcceptIcon />
  }
};

const ChatExample = () => {
  const items = [
    {
      message: (
        <Chat.Message
          content="Hello"
          author="John Doe"
          timestamp="Yesterday, 10:15 PM"
          mine
        />
      ),
      contentPosition: "end",
      attached: "top",
      key: "message-id-1"
    },
    {
      message: (
        <Chat.Message
          content="I'm back!"
          author="John Doe"
          timestamp="Yesterday, 10:15 PM"
          mine
        />
      ),
      contentPosition: "end",
      attached: true,
      key: "message-id-2"
    },
    {
      message: (
        <Chat.Message
          content={{
            content: (
              <div>
                What do you think about <a href="#">www.goodFood.com</a>?
              </div>
            )
          }}
          author="John Doe"
          timestamp="Yesterday, 10:15 PM"
          mine
        />
      ),
      contentPosition: "end",
      attached: "bottom",
      key: "message-id-3"
    },
    {
      gutter: <Avatar {...janeAvatar} />,
      message: (
        <Chat.Message
          content="Hi"
          author="Jane Doe"
          timestamp="Yesterday, 10:15 PM"
        />
      ),
      attached: "top",
      key: "message-id-4"
    },
    {
      gutter: <Avatar {...janeAvatar} />,
      message: (
        <Chat.Message
          content="Looks good!"
          author="Jane Doe"
          timestamp="Yesterday, 10:15 PM"
        />
      ),
      attached: true,
      key: "message-id-5"
    },
    {
      gutter: <Avatar {...janeAvatar} />,
      message: (
        <Chat.Message
          content={
            <div>
              I also like <a href="#">www.goodFood2.com</a>.
            </div>
          }
          author="Jane Doe"
          timestamp="Yesterday, 10:15 PM"
        />
      ),
      attached: "bottom",
      key: "message-id-6"
    },
    {
      message: (
        <Chat.Message
          content="Would you like to grab lunch there?"
          author="John Doe"
          timestamp="Yesterday, 10:16 PM"
          mine
        />
      ),
      contentPosition: "end",
      key: "message-id-7"
    },
    {
      gutter: <Avatar {...janeAvatar} />,
      message: (
        <Chat.Message
          content="Sure! Let's try it."
          author="Jane Doe"
          timestamp="Yesterday, 10:15 PM"
        />
      ),
      key: "message-id-8"
    },
    {
      children: <Divider content="Today" color="brand" important />,
      key: "message-id-9"
    },
    {
      message: (
        <Chat.Message
          content="Ok, let's go."
          author="John Doe"
          timestamp="Today, 11:15 PM"
          mine
        />
      ),
      contentPosition: "end",
      key: "message-id-10"
    }
  ];
  const [inputValue, setInputValue] = React.useState("");
  const [itemsChat, setItemsChat] = React.useState(items);
  const chatStyle = {
    height: 500,
    overflow: "scroll"
  };
  const handleKeyDown = event => {
    if (event.key == "Enter") {
      console.log(event);
      let elm = {
        message: (
          <Chat.Message
            content={inputValue}
            author="John Doe"
            timestamp="Yesterday, 10:15 PM"
            mine
          />
        ),
        contentPosition: "end",
        attached: "top",
        key: "message-id-1"
      };
      setItemsChat(itemsChat => [...itemsChat, elm]);
      setInputValue("");
    }
  };
  return (
    <div>
      <Chat style={chatStyle} items={itemsChat} />

      <Input
        fluid
        placeholder="Inverted color input..."
        value={inputValue}
        onKeyDown={event => handleKeyDown(event)}
        onChange={event => setInputValue(event.target.value)}
      />
    </div>
  );
};

export default ChatExample;

You can simply use an effect with itemsChat as dependency. Just grab the chat ul element and scroll to the bottom.

useEffect(() => {
    document.querySelector('.ui-chat').scrollTop = document.querySelector('.ui-chat').scrollHeight
  }, [itemsChat])

Working copy of your code is here