javascript - 如何在 Mobx + reactjs 中使用@Action？

Question

我对如何在我的代码中使用@action 感到困惑。

class Items {

  @observable items= [];

  @action addItem() {
    let newItem= new Item();
    items.push(newItem);
  }
}

@observer
class ItemPage extends Component {

  constructor() {
    super();
  }

  render() {
    const {addItem} = this.props.store;
    return (
      <div className="items">
        <input type="button" value="add" onClick={addItem}/>
      </div>
    )
  }
}

const store = new Items();

Answer 1

确保您更改的是 this.items 而不仅仅是 items。您还需要使用 action.bound 绑定(bind)操作或在组件中创建绑定(bind)处理程序:

class Items {
  @observable items= [];

  @action.bound
  addItem() {
    let newItem = new Item();
    this.items.push(newItem);
  }
}

@observer
class ItemPage extends Component {
  render() {
    const { addItem } = this.props.store;
    return (
      <div className="items">
        <input type="button" value="add" onClick={addItem}/>
      </div>
    );
  }
}

const store = new Items();

或者:

class Items {
  @observable items= [];

  @action
  addItem() {
    let newItem = new Item();
    this.items.push(newItem);
  }
}

@observer
class ItemPage extends Component {
  handleClick = () => {
    this.props.store.addItem();
  };
  render() {
    return (
      <div className="items">
        <input type="button" value="add" onClick={this.handleClick}/>
      </div>
    );
  }
}

const store = new Items();