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react 復習

More than 1 year has passed since last update.
わかる事
1 基本的に処理は変動しないモノには、funcsionコンポーネント 変動するやつは、classコンポーネント
2 input イベント 出力 は(inputの周りの部分)
補足
fieldsetinputをグループ化する

import React from 'react';
import ReactDOM from 'react-dom';
import './ShippingList.css';

// import App from './App';
import * as serviceWorker from './serviceWorker';

function BoilingVerdict(props) {
  if (props.celsius >= 100) {
    return <p>The water would boil.</p>;
  }
  return <p>The water would not boil.</p>;
}



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

  handleChange(e) {
    this.setState({temperature: e.target.value});
  }

  render() {
    const temperature = this.state.temperature;
    return (
      <fieldset>
        <legend>Enter temperature in Celsius:</legend>
        <input
          value={temperature}
          onChange={this.handleChange} />

        <BoilingVerdict
          celsius={parseFloat(temperature)} />

      </fieldset>
    );
  }
}

ReactDOM.render(<Calculator />  , document.getElementById('root'));



// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: http://bit.ly/CRA-PWA
serviceWorker.unregister();



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