React Refs All In One

React Refs All In One

https://reactjs.org/docs/react-api.html#refs

Ref

https://reactjs.org/docs/refs-and-the-dom.html

React.createRef

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.inputRef = React.createRef();
  }
  componentDidMount() {
    this.inputRef.current.focus();
  }
  render() {
    return <input type="text" ref={this.inputRef} />;
  }
}

React.forwardRef

const FancyButton = React.forwardRef((props, ref) => (
  <button ref={ref} className="FancyButton">
    {props.children}
  </button>
));

// You can now get a ref directly to the DOM button:
const ref = React.createRef();
<FancyButton ref={ref}>Click me!</FancyButton>;

Forwarding refs to DOM components

Forwarding refs in higher-order-components

https://reactjs.org/docs/forwarding-refs.html

useRef

React Hooks

const refContainer = useRef(initialValue);

function TextInputWithFocusButton() {
  const inputEl = useRef(null);
  const onButtonClick = () => {
    // `current` points to the mounted text input element
    inputEl.current.focus();
  };
  return (
    <>
      <input ref={inputEl} type="text" />
      <button onClick={onButtonClick}>Focus the input</button>
    </>
  );
}

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

React API

UMD + ESM

refs

---

---

xgqfrms 2012-2020

www.cnblogs.com 发布文章使用：只允许注册用户才可以访问！

---