React toggle class | 易学教程

问题

I want toggle class only click element. But now when i click anyone they are all active. And when i click a tag, i want add another class to card div. How should i update the code?

 handleClick() {
        const currentState = this.state.active;
        this.setState({ active: !currentState });
    }

<div className="container">
   <div>
     <h1>Components</h1>
     <div>
        <a href="#" onClick={this.handleClick.bind(this)} className= {this.state.active ? "card-icon active" : "card-icon"}>click</a>
        <a href="#" onClick={this.handleClick.bind(this)} className= {this.state.active ? "list-icon active" : "list-icon"}>click</a>
     </div>
   </div>
   <input type="text" placeholder="" className="input" onChange={(e)=>this.searchSpace(e)}  />
   <div className="card">
     {items}
   </div>
</div>

回答1:

You are only tracking the state with one variable (active), but you need to keep track of each state separately. Try this:

Updated to handle toggle:

 handleClick() {
        const currentState = this.state.active;
        this.setState({ active: !currentState });
    }

<div className="container">
   <div>
     <h1>Components</h1>
     <div>
        <a href="#" onClick={this.handleClick.bind(this)} className= {this.state.active ? "card-icon active" : "card-icon"}>click</a>
        <a href="#" onClick={this.handleClick.bind(this)} className= {!this.state.active ? "list-icon active" : "list-icon"}>click</a>
     </div>
   </div>
   <input type="text" placeholder="" className="input" onChange={(e)=>this.searchSpace(e)}  />
   <div className={this.state.active ? "card" : "list"}>
     {items}
   </div>
</div>

回答2:

You should be using multiple state variables and also use function to update the state, so when you set cart-icon to active the list-icon state does not change. See the example below. let me know if it helps.

class MyComp extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      cartIconActive: false,
      listIconActive: false,
    };
    this.handleCartIconClick = this.handleCartIconClick.bind(this);
    this.handleListIconClick = this.handleListIconClick.bind(this);
  }

  handleCartIconClick() {
    this.setState((prevState) => ({
      ...prevState,
      cartIconActive: !prevState.cartIconActive,
    }));
  }

  handleListIconClick() {
    this.setState((prevState) => ({
      ...prevState,
      listIconActive: !prevState.listIconActive,
    }));
  }

  render() {
    const { cartIconActive, listIconActive } = this.state;
    return (
      <div className="container">
        <div>
          <h1>Components</h1>
          <div>
            <a
              href="#"
              onClick={this.handleCartIconClick}
              className={cartIconActive ? 'card-icon active' : 'card-icon'}
            >
              click
            </a>
            <a
              href="#"
              onClick={this.handleListIconClick}
              className={listIconActive ? 'list-icon active' : 'list-icon'}
            >
              click
            </a>
          </div>
        </div>
        <input
          type="text"
          placeholder=""
          className="input"
          onChange={(e) => this.searchSpace(e)}
        />
        <div className="card">{items}</div>
      </div>
    );
  }
}

来源：https://stackoverflow.com/questions/61955420/react-toggle-class

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