你应该在componentDidMount和refs回调中做。就像这样

componentDidMount(){
   this.nameInput.focus(); 
}

class App extends React.Component{ componentDidMount(){ this.nameInput.focus(); } render() { return( <div> <input defaultValue="Won't focus" /> <input ref={(input) => { this.nameInput = input; }} defaultValue="will focus" /> </div> ); } } ReactDOM.render(<App />, document.getElementById('app')); <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.1/react.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.1/react-dom.js"></script> <div id="app"></div>

阅读几乎所有的答案，但没有看到getRenderedComponent().props.input

设置文本输入参考

this.refs.username.getRenderedComponent () .props.input.onChange(”);

React文档现在有一个专门的部分。https://facebook.github.io/react/docs/more-about-refs.html#the-ref-callback-attribute

 render: function() {
  return (
    <TextInput
      ref={function(input) {
        if (input != null) {
          input.focus();
        }
      }} />
    );
  },

本卡普的解决方案在打字稿

React 16.8 +功能组件- useFocus钩子

export const useFocus = (): [React.MutableRefObject<HTMLInputElement>, VoidFunction] => {
  const htmlElRef = React.useRef<HTMLInputElement>(null);
  const setFocus = React.useCallback(() => {
    if (htmlElRef.current) htmlElRef.current.focus();
  }, [htmlElRef]);

  return React.useMemo(() => [htmlElRef, setFocus], [htmlElRef, setFocus]);
};

请注意，这些答案对我来说都没有用material-ui TextField组件。如何将焦点设置为一个materialUI TextField?我费了好大劲才让它起作用:

const focusUsernameInputField = input => {
  if (input) {
    setTimeout(() => {input.focus()}, 100);
  }
};

return (
  <TextField
    hintText="Username"
    floatingLabelText="Username"
    ref={focusUsernameInputField}
  />
);

从React 0.15开始，最简洁的方法是:

<input ref={input => input && input.focus()}/>