使用React.createRef ()

class MessageBox extends Component {
        constructor(props) {
            super(props)
            this.boxRef = React.createRef()
        }

        scrollToBottom = () => {
            this.boxRef.current.scrollTop = this.boxRef.current.scrollHeight
        }

        componentDidUpdate = () => {
            this.scrollToBottom()
        }

        render() {
            return (
                        <div ref={this.boxRef}></div>
                    )
        }
}

 const scrollingBottom = () => {
    const e = ref;

    e.current?.scrollIntoView({
      behavior: "smooth",
      block: "center",
      inline: "start",
    });
  };

 useEffect(() => {
    scrollingBottom();
  });

<span ref={ref}>{item.body.content}</span>
    

您可以使用引用来跟踪组件。

如果你知道如何设置单个组件的引用(最后一个)，请发布!

以下是我发现对我有用的方法:

class ChatContainer extends React.Component {
  render() {
    const {
      messages
    } = this.props;

    var messageBubbles = messages.map((message, idx) => (
      <MessageBubble
        key={message.id}
        message={message.body}
        ref={(ref) => this['_div' + idx] = ref}
      />
    ));

    return (
      <div>
        {messageBubbles}
      </div>
    );
  }

  componentDidMount() {
    this.handleResize();

    // Scroll to the bottom on initialization
    var len = this.props.messages.length - 1;
    const node = ReactDOM.findDOMNode(this['_div' + len]);
    if (node) {
      node.scrollIntoView();
    }
  }

  componentDidUpdate() {
    // Scroll as new elements come along
    var len = this.props.messages.length - 1;
    const node = ReactDOM.findDOMNode(this['_div' + len]);
    if (node) {
      node.scrollIntoView();
    }
  }
}

这对我很有用

messagesEndRef.current.scrollTop = messagesEndRef.current.scrollHeight

const messagesEndRef = useRef();使用

感谢@enlitement

我们应该避免使用findDOMNode， 我们可以使用引用来跟踪组件

render() {
  ...

  return (
    <div>
      <div
        className="MessageList"
        ref={(div) => {
          this.messageList = div;
        }}
      >
        { messageListContent }
      </div>
    </div>
  );
}



scrollToBottom() {
  const scrollHeight = this.messageList.scrollHeight;
  const height = this.messageList.clientHeight;
  const maxScrollTop = scrollHeight - height;
  this.messageList.scrollTop = maxScrollTop > 0 ? maxScrollTop : 0;
}

componentDidUpdate() {
  this.scrollToBottom();
}

参考:

https://facebook.github.io/react/docs/react-dom.html#finddomnode https://www.pubnub.com/blog/2016-06-28-reactjs-chat-app-infinite-scroll-history-using-redux/

如果你想用React Hooks做到这一点，可以遵循这个方法。对于一个虚拟div已放置在聊天的底部。这里使用useRef Hook。

Hooks API参考:https://reactjs.org/docs/hooks-reference.html#useref

import React, { useEffect, useRef } from 'react';

const ChatView = ({ ...props }) => {
const el = useRef(null);

useEffect(() => {
    el.current.scrollIntoView({ block: 'end', behavior: 'smooth' });
});

 return (
   <div>
     <div className="MessageContainer" >
       <div className="MessagesList">
         {this.renderMessages()}
       </div>
       <div id={'el'} ref={el}>
       </div>
     </div>
    </div>
  );
}