如何对连接的组件使用react-i18next

Question

我想将react-i18next与我的react-redux连接组件一起使用，但不确定如何进行。

我简化了代码，显示了一个连接组件的示例：

import React from 'react';
import {connect} from 'react-redux';
import {userSelectors} from "./userSelectors";

interface IConnectedProps {
    activeUserName: string | undefined;
}
export class LandingPageComponent extends React.Component<IConnectedProps> {
    public render(): JSX.Element {
        return (
            <React.Suspense fallback={<Spinner/>}>
                <React.Fragment>
                    <div>
                    ... a bunch of controls using translated text
                    </div>
                    <div>{activeUserName}</div>
                </React.Fragment>
            </React.Suspense>
        );
    }
}

const mapStateToProps = (state: ICoreRootState) : IConnectedProps => ({
    activeUserName: userSelectors.getDisplayName(state),
});

export const LandingPage = connect(mapStateToProps)(LandingPageComponent);

已安装的程序包版本：

react version: 16.8.4 
react-redux version: 5.1.1 
react-i18next version: 10.6.0

我尝试过的：

1)当我使用withTranslation，WithTranslation时，得到如下错误：

export class LandingPageComponent extends React.Component<IConnectedProps & WithTranslation> {...}
export const LandingPage = connect(mapStateToProps)(withTranslation()(LandingPageComponent));

错误：

The above error occurred in the <withI18nextTranslation(LandingPageComponent)> component:
    in withI18nextTranslation(LandingPageComponent) (created by Connect(withI18nextTranslation(LandingPageComponent)))
    in Connect(withI18nextTranslation(LandingPageComponent))
    in Route
    in t
    in Connect(t) (at App.tsx:49)
    in Switch (at App.tsx:45)
    in App (at src/index.tsx:14)
    in Router (created by ConnectedRouter)
    in ConnectedRouter (created by Connect(ConnectedRouter))
    in Connect(ConnectedRouter) (at src/index.tsx:13)
    in Provider (at src/index.tsx:12)

2)当我使用withTranslation，WithTranslation时，得到如下错误：

export class LandingPageComponent extends React.Component<IConnectedProps & WithTranslation> {...}
export const LandingPage = withTranslation()(connect(mapStateToProps)(LandingPageComponent));

错误：

index.js:1446 The above error occurred in the <withI18nextTranslation(Connect(LandingPageComponent))> component:
    in withI18nextTranslation(Connect(LandingPageComponent))
    in Route
    in t
    in Connect(t) (at App.tsx:49)
    in Switch (at App.tsx:45)
    in App (at src/index.tsx:14)
    in Router (created by ConnectedRouter)
    in ConnectedRouter (created by Connect(ConnectedRouter))
    in Connect(ConnectedRouter) (at src/index.tsx:13)
    in Provider (at src/index.tsx:12)

3)我不能使用useTranslation，因为钩子不允许在类中使用。

我还尝试了以下几种方法：

... a bunch of imports
interface ILogoutButtonProps {
    userName?: string;
}
interface IConnectedHandlers {
    readonly logout: any;
    readonly push: any;
}
class InnerLogoutComponent extends React.Component<IButtonProps & IConnectedHandlers & ILogoutButtonProps & WithTranslation, {}> {

    public render() {
        const {userName, onClick, logout: Logout, push: Push, ...buttonProps} = this.props;
        const logoutText = this.props.i18n.t(StringNames.logout);
        const buttonText = userName ? logoutText + " " + userName : logoutText;
        return (
            <Button {...buttonProps} text={buttonText} onClick={this.handleClick}/>
        );
    }

    private handleClick = (event: React.MouseEvent<HTMLElement>) : void => {
        this.props.logout()
            .then(() => this.props.push(LoginPaths.verifyUser));
    }
}
const InnerLogoutTranslatedComponent = withTranslation()(InnerLogoutComponent);

class LogoutComponentInternal extends React.Component<IButtonProps & IConnectedHandlers & ILogoutButtonProps, {}> {
    public render () {
        return (
            <InnerLogoutTranslatedComponent {...this.props}/>
        );
    }
}
export const LogoutComponent = connect(null,{logout, push})(LogoutComponentInternal);

但我得到以下错误：

Hooks can only be called inside the body of a function component. 

先谢谢你……

Answer 1

在我们的项目中，我们成功地利用了：

import { compose } from 'redux';
import { withNamespaces } from 'react-i18next';
import { connect } from 'react-redux';
...
export default compose(withNamespaces('translation'), connect(mapStateToProps))(ComponentName);

这样，我们就可以通过mapStateToProps连接到Redux，我们就有了translations。

Answer 2

我在RazzleJS中使用SSR，在我的情况下，它工作得很好。我是这样连接我的connect和withTranslation的：

export default connect(mapStateToProps,mapDispatchToProps)(withTranslation()(Component));

Answer 3

实际上，我很难确定您在HOC中包装组件的顺序。在我目前工作的项目中，我们像withNamespaces(connect(withStyles(component)))一样包装，它工作得非常好(withNamespaces本质上和withTranslations是一样的)。我们在尝试连接已翻译的组件时遇到了问题，您现在可能也遇到了同样的问题。下面是我们的方法：

你有一个“正常”的组件，比如

type InjectedProps = StateProps & ExternalProps & MyComponentsTranslations
export class MyComponent extends React.Component<InjectedProps> {
    ...
} 

(注意:该过程与功能组件的工作方式完全相同)

你可以使用const MyConnectedComponent = connect(mapStateToProps, mapDispatchToProps)(MyComponent)

最后，你要做一个

import {WithNamespaces, withNamespaces} from "react-i18next"
export const LocalizedMyComponent = withNamespaces()(
  ({t,...rest}): WithNamepsaces) => (
    <MyConnectedComponent translations={{ put translations here }} {...rest} />
  )
)

现在，诀窍是我们定义了一个interface MyComponentsTranslations {}，其中我们放置了所有需要的翻译或翻译函数(在复数的情况下)。将MyComponentsTranslations添加到InjectedProps中，以使它们在原始组件中可用。

您总是可以简单地将i18n的t-function注入到您的组件中，但在我当前的项目中，我们认为这样做更简洁

• 显式命名component
• Since所需的翻译无论是原始组件还是连通组件都不依赖于t函数它们非常容易测试

如果这对你有效，请告诉我。

此外，为了让整个过程更优雅一些，您可以使用这些助手：

export interface Translations<T> {
  translations: T
}

export const createTranslations = <T>(translations: T): Translations<T> => ({
  translations,
})

这允许您设置

type InjectedProps = StateProps & Translations<MyComponentTranslations>

在withNamespace hoc中：

<MyConnectedComponent {...createTranslations<MyComponentTranslations>({ put translations here })} {...rest} />