javascript - 单选按钮组验证。使用 alert Reactjs 突出显示所有未选中的单选按钮问题

Question

如何实现单选组验证

onClick 提交按钮，它应该突出显示没有用红色或某种验证回答的单选组或问题。

例如，如果未选中任何单选组按钮，则单击提交按钮将 ListGroupItem bsStyle="danger"更改为特定列表。

原始代码 https://stackblitz.com/edit/react-ujmlcz

//array of cards coming from the backend
const data = [
  {
    cardName: 'Do you want  sugar in your coffee',
    options: [
    { radioName: 'Yes',radioValue: '1', selected: false },
    { radioName: 'No',radioValue: '2', selected: false }]
  },
  {
    cardName: 'Do you want  milk in your coffee', 
    options: [
    { radioName: 'Yes',radioValue: '1', selected: false },
    { radioName: 'No',radioValue: '2', selected: false }]
  },
  {
    cardName: 'Do you want  low-fat-milk in your coffee', 
    options: [
    { radioName: 'Yes',radioValue: '1', selected: false },
    { radioName: 'No',radioValue: '2', selected: false }]
  }
];


class CardsList extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
cards: [],

    };
  }

  componentDidMount() {
    setTimeout(() => {
      // mimic an async server call
      this.setState({ cards: data });
    }, 1000);
  }

  onInputChange = ({ target }) => {
    const { cards } = this.state;
    const nexState = cards.map(card => {
      if (card.cardName !== target.name) return card;
      return {
        ...card,
        options: card.options.map(opt => {
          const checked = opt.radioName === target.value;
          return {
            ...opt,
            selected: checked
          }
        })
      }
    });
    this.setState({ cards: nexState })
  }

  onSubmit = () => { 
  let unselectedCards = this.state.cards.filter((card) => {
   return !card.options[0].selected && !card.options[1].selected
});
    console.log("Please answer all the questions"+unselectedCards);
    
 console.log(this.state.cards.map(({ cardName, options }) => {
  const option = options.filter(({ selected }) => selected)[0]
  return ` ${option.radioValue}`
}))
  };

 onReset = () => {
        this.setState({cards:[]});
      }
  render() {
    const { cards } = this.state;
    return (
      <div>
        {
          cards.length < 1 ? "Loading..." :
            <div>
              {cards.map((card, idx) => (
                <ul>
                  {card.cardName}
                  {card.options.radioName}

                  {
                    card.options.map((lo, idx) => {
                      return <input
                        key={idx}
                        type="radio"
                        name={card.cardName}
                        value={lo.radioName}
                        checked={!!lo.selected}
                        onChange={this.onInputChange}
                      />

                    })
                  }
                </ul>
              ))
              }
              < button onClick={this.onSubmit}>Submit</button>
               < button onClick={this.onReset}>Clear</button>
            </div>
        }

      </div>
    );
  }
}

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

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>

Answer 1

要实现这一点，您首先需要扩展您的状态模型。考虑通过添加以下内容在每张卡片中跟踪您的“bsStyle”:

const data = [
  {
    cardName: 'Tires are inflated and free of excessive wear or damage.  Nuts are tight.',
    style : 'info', // <-- this is your bsStyle tracked for each card
    options: [
      { radioName: 'Yes', radioValue: '1', selected: false },
      { radioName: 'No', radioValue: '2', selected: false }]
  },
  ...,
  ...
]

这允许您的组件独立地了解并呈现每张卡片的适当 bsStyle。有了这个，您现在可以通过添加以下“验证”功能来更新您的 onSubmit 函数:

  onSubmit = () => {

    this.state.cards.forEach((card) => {
      // If no option in the card is selected, consider the card invalid
      var invalid = card.options.every(option => !option.selected)
      if(invalid) {
        card.style='danger'
      }
      else {
        card.style='info'
      }
    });

    // Cause form to re-render to display "danger" or "info" bsStyle
    this.setState({ cards : this.state.cards })

    ...
    ...
 }

您还需要确保在用户更改输入时更新验证。您可以通过以下方式实现:

  onInputChange = ({ target }) => {
    const { cards } = this.state;
    const { options } = this.state;

    const nexState = cards.map(card => {
      if (card.cardName !== target.name) return card;

      const options = card.options.map(opt => {
        const checked = opt.radioName === target.value;
        return {
          ...opt,
          selected: checked
        }
      })

      const style = options.every(option => !option.selected) ? 'danger' : 'info'

      return {
        ...card,
        style,
        options 
      }
    });
    this.setState({ cards: nexState })
  }

最后，您需要通过进行以下调整来更新 ListGroupItem 的呈现方式:

{cards.map((card, idx) => (
    <ListGroup bsStyle="custom">
        <ListGroupItem bsStyle={ card.style }>
        ...
        </ListGroupItem>
    </ListGroup>)}

有关更多详细信息，您可以在此处找到完整的工作示例: https://stackblitz.com/edit/react-immp6b?file=index.js