如何在反应中只切换一项？

Question

我正在使用 reactstrap Collapse 制作一个可折叠部分。

收到的数据是嵌套的，我需要在第二层显示折叠按钮，第三层会有数据显示。

这一层显示没有问题，点击按钮时已经在第三层显示数据了。

问题：点击任何按钮时，所有可折叠部分都会打开，而不是点击的部分。

要求：只有被点击部分的标记需要被显示，并且在再次点击按钮时它应该被折叠回来并且它不应该与任何其他项目有任何关系。 p>

工作片段如下，

const data = [{"orderId":1,"orderNo":"123", "orderParts":[{"orderPartsId":1,"orderPrtNo":"OP-1", "regTokens":["Token1", "Token2","Token3"]}] },
{"orderId":2,"orderNo":"456", "orderParts":[{"orderPartsId":1,"orderPrtNo":"OP-1", "regTokens":["Token1","Token3"]}] },
{"orderId":3,"orderNo":"789", "orderParts":[{"orderPartsId":1,"orderPrtNo":"OP-1", "regTokens":["Token1", "Token2","Token3", "Token4"]}] }
]

const {Component, Fragment} = React;
const {Button, Collapse} = Reactstrap;

class Menu extends Component {
  constructor(props) {
    super(props);
    this.state = {
      open: false
    };
  }
  
  toggle = () =>
  this.setState(s => ({
    open: !s.open
  }));

  render() {
  console.log();
    return <div> 
      {
        data.map((levelOneItem, i) => {
          return(
          <div>
          <div> Order Id:  {levelOneItem.orderId} </div>
          {
            levelOneItem.orderParts.map((levelTwoItem, j) => {
               return(
                  <div>
                  <div> Order Part Id: {levelTwoItem.orderPartsId} </div>
                  <Button onClick={this.toggle}>Display Token</Button>
                  <Collapse isOpen={this.state.open}>
                    {
                       <div>
                        {levelTwoItem.regTokens.map((levelThreeItem, k) => {
                          return(<span> {levelThreeItem} </span>)
                        })
                     }
                       </div>
                    }
                  </Collapse>
                  </div>
               )
            })
          }
          </div>
          )
        })
      }
    </div>;
  }

}


ReactDOM.render(<Menu />, document.getElementById("root"));

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/reactstrap/8.4.1/reactstrap.min.js"></script>

<div id="root"></div>

请帮助我实现仅在所选项目上切换提供的嵌套数据的结果。

Answer 1

为您的处理函数添加一个识别索引作为参数就可以了。

this.state = {
  open: ''
};

toggle = idx => () => {
  this.setState(prevState => ({open: prevState.open === idx ? '' : idx}));
}

<Button onClick={this.toggle(i)}>
<Collapse isOpen={open === i}>

---

更新

如果您希望它们独立，则需要一个数组来存储每个状态。

this.state = {
  open: [0, 2]                                // Initial opened item's index
};

toggle = idx => () => {
  this.setState(prevState => ({
    open: this.state.open.includes(idx)       // check whether been expanded
      ? prevState.open.filter(x => x !== idx) // if yes, remove from list
      : [...prevState.open, idx]}             // if no, add to list
    ))
}

<Button onClick={this.toggle(i)}>
<Collapse isOpen={open.includes(i)}>

const data = [{"orderId":1,"orderNo":"123", "orderParts":[{"orderPartsId":1,"orderPrtNo":"OP-1", "regTokens":["Token1", "Token2","Token3"]}] },
{"orderId":2,"orderNo":"456", "orderParts":[{"orderPartsId":1,"orderPrtNo":"OP-1", "regTokens":["Token1","Token3"]}] },
{"orderId":3,"orderNo":"789", "orderParts":[{"orderPartsId":1,"orderPrtNo":"OP-1", "regTokens":["Token1", "Token2","Token3", "Token4"]}] }
]

const {Component, Fragment} = React;
const {Button, Collapse} = Reactstrap;

class Menu extends Component {
  constructor(props) {
    super(props);
    this.state = {
      open: [0, 2]  // Initial opened item's index
    };
  }
  
  toggle = idx => () => {
    this.setState(prevState => ({open: this.state.open.includes(idx) ? prevState.open.filter(x => x !== idx) : [...prevState.open, idx]})
  )}
  render() {
  const { open } = this.state;
    return <div> 
      {
        data.map((levelOneItem, i) => {
          return(
          <div>
          <div> Order Id:  {levelOneItem.orderId} </div>
          {
            levelOneItem.orderParts.map((levelTwoItem, j) => {
               return(
                  <div>
                  <div> Order Part Id: {levelTwoItem.orderPartsId} </div>
                  <Button onClick={this.toggle(i)}>Display Token</Button>
                  <Collapse isOpen={open.includes(i)}>
                    {
                       <div>
                        {levelTwoItem.regTokens.map((levelThreeItem, k) => {
                          return(<span> {levelThreeItem} </span>)
                        })
                     }
                       </div>
                    }
                  </Collapse>
                  </div>
               )
            })
          }
          </div>
          )
        })
      }
    </div>;
  }

}


ReactDOM.render(<Menu />, document.getElementById("root"));

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/reactstrap/8.4.1/reactstrap.min.js"></script>

<div id="root"></div>