React获取input值并提交的2种方法实例

import React from 'react';
 
class InputDemo extends React.Component{
  state = {
    InputValue : "",//输入框输入值
  };
 
  handleGetInputValue = (event) => {
    this.setState({
      InputValue : event.target.value,
    })
  };
 
  handlePost = () => {
    const {InputValue} = this.state;
    console.log(InputValue,'------InputValue');
    //在此做提交操作，比如发dispatch等
  };
 
  render(){
    return(
      <div>
        <input
          value={this.state.InputValue}
          onChange={this.handleGetInputValue}
        />
        <button onClick={this.handlePost}>提交</button>
      </div>
    )
  }
}
 
export default InputDemo;

const InputDemo = () => {
  let inputValue;
  const handlePost = (e) => {
    if (e) e.preventDefault();
    const valueTemp = inputValue.value;
    console.log(valueTemp, '------valueTemp');
    //在此做提交操作，比如发dispatch等
  };
 
  return (
    <div>
      <form onSubmit={handlePost}>
        <input
          ref={input => inputValue = input}
        />
        <button onClick={handlePost}>提交</button>
      </form>
    </div>
  )
};
 
export default InputDemo;

import React from 'react';
 
class InputDemo extends React.Component {
  handlePost = (e) => {
    if (e) e.preventDefault();
    const valueTemp = this.inputValue.value;
    console.log(valueTemp, '------valueTemp');
    //在此做提交操作，比如发dispatch等
  };
 
  render() {
    return (
      <div>
        <form onSubmit={this.handlePost}>
          <input
            ref={input => this.inputValue = input}
          />
          <button onClick={this.handlePost}>提交</button>
        </form>
      </div>
    )
  }
};
 
export default InputDemo;