在我的React应用中,我有3个组成部分。从第一个组件的按钮开始,我使用链接转到第二个组件。在第二处,我创建一个状态(redux存储),对其进行操作,并在完成操作后通过提交按钮将我重定向到第三处。在第三个组件上,我还看到了状态(通过redux chrome工具),但是在这里,当我刷新页面(更改并保存代码时的webpack事情)时,我失去了状态并得到了一个空对象。
这是我的应用程序的结构。
index.js
const store = createStore(
rootReducer,
composeWithDevTools(applyMiddleware(thunk))
);
ReactDOM.render(
<BrowserRouter>
<Provider store={store}>
<Route component={App} />
</Provider>
</BrowserRouter>,
document.getElementById("root")
);
App.js
const App = ({ location }) => (
<Container>
<Route location={location} path="/" exact component={HomePage} />
<Route location={location} path="/GameInit" exact component={GameInit} />
<Route location={location} path="/Battle" exact component={Battle} />
</Container>
);
App.propTypes = {
location: PropTypes.shape({
pathname: PropTypes.string.isRequired
}).isRequired
};
export default App;
在主页上,我有一个链接到GameInit的按钮
const HomePage = () => (<Button color="blue" as={Link} to="/GameInit">START GAME</Button>);
export default HomePage;
GameInit页面看起来像
class GameInit extends Component {
componentWillMount() {
const { createNewPlayer} = this.props;
createNewPlayer();
}
/* state manipulation till it gets valid */
palyerIsReady()=>{ history.push("/Battle");}
export default connect(mapStateToProps,{ createNewPlayer})(GameInit);
最后是Battle组件,我首先看到状态但刷新后丢失
class Battle extends Component {
render() {return (/*some stuff*/);}}
Battle.propTypes = {
players: PropTypes.object.isRequired // eslint-disable-line
};
const mapStateToProps = state => ({
players: state.players
});
export default connect(mapStateToProps,null)(Battle);
答案 0 :(得分:4)
您可以轻松地将其持久存储在本地存储中。请查看下面的示例。
const loadState = () => {
try {
const serializedState = localStorage.getItem('state');
if(serializedState === null) {
return undefined;
}
return JSON.parse(serializedState);
} catch (e) {
return undefined;
}
};
const saveState = (state) => {
try {
const serializedState = JSON.stringify(state);
localStorage.setItem('state', serializedState);
} catch (e) {
// Ignore write errors;
}
};
const peristedState = loadState();
store.subscribe(() => {
saveState(store.getState());
});
const store = createStore(
// Other reducer
persistedState,
);
render(
<Provider store={store}>
<App/>
</Provider>,
document.getElementById('root');
);
串行化是一项昂贵的操作。您应该使用节流功能(例如lodash
实现的节流功能)来限制保存次数。
例如:
import throttle from 'lodash/throttle';
store.subscribe(throttle(() => {
saveState(store.getState());
}, 1000));
答案 1 :(得分:2)
您可以使用类似redux-persist的方式将redux状态保存到local storage
或
到另一个存储系统。
答案 2 :(得分:0)
我对热重装的个人建议是使用React hot loader,这可以防止页面重装并且仅切出更改的块。这意味着您的状态不会在开发时迷路。
这很容易安装。您只需添加一个条目并将初始组件包装在hot
中,您就可以从软件包中获取它。
如果您需要有关其工作原理的更多信息,建议您观看创建者的this talk。
答案 3 :(得分:0)
import React from "react";
import ReactDOM from "react-dom";
import "./index.css";
import * as serviceWorker from "./serviceWorker";
import { Provider } from "react-redux";
import { store } from "./rootReducer";
import { BrowserRouter } from "react-router-dom";
if (process.env.NODE_ENV === "development" && module.hot) {
module.hot.accept("./rootReducer", () => {
const newRootReducer = require("./rootReducer").default;
store.replaceReducer(newRootReducer);
});
}
export type AppDispatch = typeof store.dispatch;
const render = () => {
const App = require("./App").default;
ReactDOM.render(
<Provider store={store}>
<BrowserRouter>
<App />
</BrowserRouter>
</Provider>,
document.getElementById("root"),
);
};
render();
if (process.env.NODE_ENV === "development" && module.hot) {
module.hot.accept("./App", render);
}
答案 4 :(得分:0)
Alexender Annic 以正确的方式回答:
// persist store code
const loadState = () => {
try {
const serializedState = localStorage.getItem('state');
if(serializedState === null) {
return undefined;
}
return JSON.parse(serializedState);
} catch (e) {
return undefined;
}
};
const saveState = (state) => {
try {
const serializedState = JSON.stringify(state);
localStorage.setItem('state', serializedState);
} catch (e) {
// Ignore write errors;
}
};
const persistedState = loadState();
// This persistedState is includedat the time of store creation as initial value
const store = createStore(reducers, persistedState);
// This is actually call every time when store saved
store.subscribe(() => {
saveState(store.getState());
});
export default store;