React Hooks:处理多个输入 [英] React Hooks: handle multiple inputs

问题描述

在 react docs 表单部分上有以下使用类组件的示例:

on react docs forms section there is the following example using class components:

class Reservation extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isGoing: true,
      numberOfGuests: 2
    };

    this.handleInputChange = this.handleInputChange.bind(this);
  }

  handleInputChange(event) {
    const target = event.target;
    const value = target.type === 'checkbox' ? target.checked : target.value;
    const name = target.name;

    this.setState({
      [name]: value
    });
  }

  render() {
    return (
      <form>
        <label>
          Is going:
          <input
            name="isGoing"
            type="checkbox"
            checked={this.state.isGoing}
            onChange={this.handleInputChange} />
        </label>
        <br />
        <label>
          Number of guests:
          <input
            name="numberOfGuests"
            type="number"
            value={this.state.numberOfGuests}
            onChange={this.handleInputChange} />
        </label>
      </form>
    );
  }
}

考虑到 Hooks 只能在 React 函数组件或自定义 React Hook 函数中调用，有没有办法使用钩子来代替?

Considering Hooks can only be called either in a React function component or a custom React Hook function is there a way of doing it using hooks instead?

推荐答案

example

const MyComponent = () => {
   const [inputs,setInputs] = useState({});

   return (
     <> 
      <input key="field1" name="field1" onChange={({target}) => setInputs(state => ({...state,field1:target.value}))} value={inputs.field1}/>
      <input key="field2" name="field2" onChange={({target}) => setInputs(state => ({...state,field2:target.value}))} value={inputs.field2}/>
     </>
   )

}

你可以像这样传入初始值:

you can pass in initial values like this:

const MyComponent = (initialValues = {}) => {
   const [inputs,setInputs] = useState(initialValues);
   ...
}

根据 @hamidreza 的 的简短 onChangehref="https://stackoverflow.com/questions/63710791/react-hooks-handle-multiple-inputs/63711951?noredirect=1#comment117486970_63711951">评论

A nice short onChange according to @hamidreza's comment

const MyComponent = (initialValues = {}) => {
   const [inputs,setInputs] = useState(initialValues);
   const onChangeHandler = useCallback(
     ({target:{name,value}}) => setInputs(state => ({ ...state, [name]:value }), [])
   );

   return (
     <> 
      <input key="field1" name="field1" onChange={onChangeHandler} value={inputs.field1}/>
      <input key="field2" name="field2" onChange={onChangeHandler} value={inputs.field2}/>
     </>
   )


}

等等等等等等

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