[英]Prefetch data with React Router 4
我正在嘗試遷移到React Router的v4,並且卡住了預取數據。 我們過去具有匹配功能的最新版本。
返回的參數之一是renderProps,但是現在我不能使用match,所以我不知道如何預取數據。 該文檔顯示了如何加載數據,但不適用於我,因為我正在使用新版本的react-router-redux同步存儲。
這是客戶端的代碼:
return (
<MuiThemeProvider muiTheme={letgoMuiTheme}>
<Provider store={store}>
<IntlProvider>
{ routes(history, store) }
</IntlProvider>
</Provider>
</MuiThemeProvider>
);
路線:
export default function routes(history) {
return (
<ConnectedRouter history={history}>
<Switch>
<Route exact path="/" component={App} />
<Route path="/:lang/chat" component={Chat} />
...
<Route path="*" component={NotFound} status={404} />
</Switch>
</ConnectedRouter>
);
}
服務器:
if (context.url) {
res.redirect(302, redirectLocation.pathname + redirectLocation.search);
} else {
const render = () => {
const body = renderToString(
<StaticRouter
location={req.url}
context={context}
>
<MuiThemeProvider muiTheme={muiTheme}>
<Provider store={store}>
<IntlProvider>
{ routes(history, store) }
</IntlProvider>
</Provider>
</MuiThemeProvider>,
</StaticRouter>
);
res.setHeader('content-language', locale);
res.render('index', {
head,
body,
locale,
state: stringState,
...
});
};
Promise.all(
prefetchData(renderProps, store),
)
.then(render)
.catch(prefetchError => next(prefetchError));
}
那是我的舊服務器文件:
match({ history, routes, location: req.url }, (error, redirectLocation, renderProps) => {
if (error) {
throw error;
} else if (redirectLocation) {
res.redirect(302, redirectLocation.pathname + redirectLocation.search);
} else if (renderProps) {
// Render react components once store is initializaed and return HTTP response
const render = () => {
const body = renderToString(
<MuiThemeProvider muiTheme={muiTheme}>
<Provider store={store}>
<IntlProvider>
<RouterContext {...renderProps} />
</IntlProvider>
</Provider>
</MuiThemeProvider>,
);
res.setHeader('content-language', locale);
res.render('index', {
head,
newrelicScript,
body,
locale,
state: stringState,
...
});
};
// Fetch components data and render HTML (no matter the fetch results
// we need to render something)
Promise.all(
prefetchData(renderProps, store),
)
.then(render)
.catch(prefetchError => next(prefetchError));
} else {
logger.warning('Ops !!! We should never arrive here :(');
next();
}
});
並預取數據:
export const prefetchData = (renderProps, store) => {
const { components, params } = renderProps;
const { dispatch } = store;
const state = store.getState();
const extractWrappedComponent = (component) => {
if (component.WrappedComponent) {
return extractWrappedComponent(component.WrappedComponent);
}
return component;
};
return components
.filter(component => component !== undefined)
// Get component, be aware if they are wrapped by redux connect or intl.
.map(component => extractWrappedComponent(component))
// Get the fetchData method of each component
.map(component => component.fetchData)
.filter(fetchData => fetchData !== undefined)
// Invoke each fetchData to initialize the redux state.
.map(fetchData => fetchData(state, dispatch, params));
};
經過研究,我找到了適合我的解決方案。 這是幫助器(之前是prefetchData)。 matchPath
來自react-router-dom
。
export const getRouteData = (routesArray, url, store) => {
const { dispatch } = store;
const state = store.getState();
const extractWrappedComponent = (component) => {
if (component.WrappedComponent) {
return extractWrappedComponent(component.WrappedComponent);
}
return component;
};
return routesArray.map((route) => {
const component = route.component;
const extractedComponent = extractWrappedComponent(component);
const match = matchPath(url, { path: route.path, exact: route.exact, strict: false });
if (match) {
if (extractedComponent.fetchData !== undefined) {
extractedComponent.fetchData(state, dispatch, match.params);
}
}
});
}
然后我稱之為:
getRouteData(routes, req.url, store);
路由是靜態路由 :
export const routes = [
{
path: '/',
component: App
},
{
path: '/:lang/chat',
component: Chat
}
...
我的服務器文件現在不匹配。 代替:
if (context.url) {
res.redirect(302, context.url);
} else {
const render = () => {
const body = renderApp(req, muiTheme, store, history, context);
res.render('index', {
head,
body,
locale,
...
});
};
Promise.all(
getRouteData(routes, req.url, store),
)
.then(render)
.catch(prefetchError => next(prefetchError));
RenderApp文件(沒有StaticRouter
客戶端必須相同):
const renderApp = (req, muiTheme, store, history, context) => {
const app = (
<MuiThemeProvider muiTheme={muiTheme}>
<Provider store={store}>
<IntlProvider>
<StaticRouter
location={req.url}
context={context}
>
{ appRoutes(history) }
</StaticRouter>
</IntlProvider>
</Provider>
</MuiThemeProvider>
);
return renderToString(app);
};
appRoutes文件:
export default function appRoutes(history) {
return (
<ConnectedRouter history={history}>
<div>
{routes.map((route, key) => (
<Route key={key} {...route} />
))}
</div>
</ConnectedRouter>
);
}
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