如果我将浏览器网址设置为:/uni-classi-virtuali/gestisci/1
组件 DettaglioClasseVirtuale
的函数 componentWillMount
(我在其中进行获取资源调用)在 rootSaga
启动之前调用。
是否有一种标准方法可以让 saga 在应用程序启动时获取资源?
这是我的传奇观察者,用于获取资源“classivirtualiuni”项目:
export function* watchGetClasseVirtualiUni() {
yield takeEvery(GET_CLASSE.REQUEST, getClasseVirtualiUni)
}
export function* getClasseVirtualiUni(action) {
try {
const data = yield call(fetchResource, `classivirtualiuni/${action.id}`)
if (data.success) {
yield put(getClasse.success(data.content))
} else {
yield put(getClasse.failure(data.message))
}
} catch (error) {
yield put(getClasse.failure(error.message))
}
}
由一个简单的rootsaga调用:
export default function* rootSaga() {
yield [
// ...
// ...
watchGetClasseVirtualiUni()
]
}
这是我的由 react 路由器处理的应用程序类:
class App extends Component {
render() {
return (
<Router history={browserHistory}>
<Route path={'/uni-classi-virtuali'} component={Main} >
<IndexRedirect to={'/uni-classi-virtuali/gestisci'} />
<Route path={'crea'} component={CreateClasseVirtualeUni} />
<Route path={'gestisci'} component={ClasseVirtualeList} >
<Route path={':id'} component={DettaglioClasseVirtuale} />
</Route>
<Route path={'iscriviti'} component={IscrivitiClasseVirtuale} />
</Route>
</Router>
)
}
}
这是调用获取数据的组件:
class DettaglioClasseVirtuale extends Component {
componentWillMount() {
// dispatch the GET_CLASSE.REQUEST action
this.fetchClasseVirtuale(this.props.classeId)
}
// ...
}
这是应用程序的核心:
function configureStore(initialState) {
const sagaMiddleware = createSagaMiddleware()
let finalCreateStore = applyMiddleware(thunk, sagaMiddleware)(createStore)
const store = finalCreateStore(reducer, initialState);
store.runSaga = sagaMiddleware.run
store.close = () => store.dispatch(END)
return store;
}
const store = configureStore()
store.runSaga(rootSaga)
ReactDOM.render(
<div>
<Provider store={store}>
<App />
</Provider>
</div>,
document.getElementById('virtual-class')
)
最佳答案
我找到了一个干净简单的解决方法:在 rootSaga 中放置一个准备好的操作并在 Main 组件中等待它。
export default function* rootSaga() {
yield [
// ...
// ...
watchGetClasseVirtualiUni(),
put(ready())
]
}
class App extends Component {
render() {
return (
<Loader isLoaded={this.props.ready}>
<Router history={browserHistory}>
<Route path={'/uni-classi-virtuali'} component={Main} >
{//...}
</Route>
</Router>
</Loader>
)
}
}
关于javascript - 如何在安装 React 组件之前让 Saga 监视事件?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40552692/