react value code example

Example 1: react forms

class NameForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {value: ''};
    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(event) {    this.setState({value: event.target.value});  }
  handleSubmit(event) {
    alert('A name was submitted: ' + this.state.value);
    event.preventDefault();
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label>
          Name:
          <input type="text" value={this.state.value} onChange={this.handleChange} />        </label>
        <input type="submit" value="Submit" />
      </form>
    );
  }
}

Example 2: react value

// it a component
import React from 'react';

class App extends React.Component {
      //call function (ECMAScript 5) from tag input:text
  handleChange = e => {
    //
    console.log(`${e.target.value}`)
  }
  render() { 
    return (
      <div className="App">
        <input type="text" name="input" id="" placeholder="" onChange={this.handleChange}/>
      </div>
    );
}
}

export default App;

Example 3: react file input

<input type="file" />