React MobX不会在道具更改时触发重新渲染

时间:2019-04-01 12:12:37

标签: reactjs typescript mobx mobx-react

我是MobX的新手,在调用异步操作时遇到了一些问题。我的商店具有用于更新Observabel数组的异步功能:

export class AccountStore implements IAccountStore {
@observable accounts:any = [];
@observable state = "pending"; // "pending" / "done" / "error"

@action
public async getAccounts() {
    this.state = "pending"
    try {
        const res = await accountsService.getAll();
        runInAction(() => {
            console.log(res);
            this.state = "done";
            this.accounts.replace(res.data);
        })
    } catch (error) {
        runInAction(() => {
            this.state = error;
        })
    }
}

}

但是我的组件不会在更新时重新渲染(在componentDidMount上调用):

interface AppProps {
accountStore: IAccountStore
}

@inject('accountStore')
@observer
class AllAcounts extends Component<AppProps, any> {
constructor(props: any) {
    super(props);
}

public componentDidMount() {
    this.props.accountStore.getAccounts();
    console.log(this.props.accountStore)
}

render() {
    const accounts = this.props.accountStore.accounts;
    return (
        <div>
            <h4>All accounts</h4>
            {accounts.map((item: any, index: number) => {
                <p key={index}>{item.name}</p>
            })
            }
            <button onClick={() => this.props.accountStore.getAccounts()}>Update</button>
        </div>
    );
}
}

export default AllAcounts;

当我在Chrome中使用React检查器时,我看到道具正在更新。

关于我要去哪里的任何建议吗?

1 个答案:

答案 0 :(得分:1)

您不会从组件的render方法中提供给map的函数中返回任何内容。添加return关键字,它将按预期工作。

{accounts.map((item, index) => {
  return <p key={index}>{item.name}</p>;
})}