React ref 返回一个“Connect"对象而不是 DOM [英] React ref returns a 'Connect' object instead of DOM

问题描述

我正在尝试为通过 map 函数创建的自定义组件创建动态引用.

class PostsList extends Component {构造函数(道具){超级(道具)；}componentDidUpdate = () =>{控制台日志(this.refs)；}使成为() {让帖子 = this.props.posts ||[];返回 (<div ref="测试">{posts.map((post) => {return <Post post={post} key={post.id} ref={post.id}></Post>})}

);}}导出默认帖子列表

console.log 为 refs.test 返回正确的 DOM 节点，但对于循环中的那些，它返回一个 Connect 对象.

有人能指出我正确的方向吗?

解决方案

看起来 Post 是一个连接的组件，而您实际上想要的是包装好的组件.

react-redux ≥ 6.0.0

连接forwardRef: true

connect(null, null, null, { forwardRef: true })(Post);

然后正常添加一个引用:

ref={ref =>这个= 参考}

来自 文档:

<块引用>

如果 {forwardRef : true} 已传递给 connect，则向连接的包装器组件实际上将返回包裹组件.

<人力资源>
react-redux 6

连接withRef: true

connect(null, null, null, { withRef: true })(Post);

然后使用getWrappedInstance()获取底层连接组件:

this.refs[].getWrappedInstance()

来自文档:

<块引用>

[withRef](布尔值):如果为 true，则存储对包装组件实例的引用，并通过 getWrappedInstance() 方法使其可用.默认值:false

I'm trying to create dynamics refs for custom components created through the map function.

class PostsList extends Component {

  constructor(props) {
    super(props);
  }

  componentDidUpdate = () => {
    console.log(this.refs);
  }

  render() {
    let posts = this.props.posts || [];
    return (
        <div ref="test">
          {posts.map((post) => {
            return <Post post={post} key={post.id} ref={post.id}></Post>
          })}
        </div>
    );
  }

}

export default PostsList

the console.log returns the correct DOM node for refs.test but for the ones in the loop, it's returning a Connect Object.

Can someone point me in the right direction?

解决方案

It seems like Post is a connected component, while you actually want the wrapped one.

react-redux ≥ 6.0.0

Connect with forwardRef: true

connect(null, null, null, { forwardRef: true })(Post);

then add a ref normally:

ref={ref => this.<id> = ref}

From the docs:

If {forwardRef : true} has been passed to connect, adding a ref to the connected wrapper component will actually return the instance of the wrapped component.

---

react-redux < 6

Connect with withRef: true

connect(null, null, null, { withRef: true })(Post);

then use getWrappedInstance() to get the underlying connected component:

this.refs[<id>].getWrappedInstance()

From the docs:

[withRef] (Boolean): If true, stores a ref to the wrapped component instance and makes it available via getWrappedInstance() method. Default value: false

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