zil*_*nas 4 javascript reactjs react-router-v4
大家好!
我有一个带有简单登录功能的React.js项目。在授权用户之后,我调用history.push方法,该方法会更改地址栏中的链接,但不会呈现新组件。(我使用BrowserRouter)
我的index.js组件:
ReactDOM.render(
<Provider store={createStore(mainReducer, applyMiddleware(thunk))}>
<BrowserRouter>
<Main />
</BrowserRouter>
</Provider>,
document.getElementById('root')
);
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我的Main.js组件:
const Main = (props) => {
return (
<Switch>
<Route exact path="/" component={Signin} />
<Route exact path="/servers" component={Servers} />
</Switch>
)}
export default withRouter(Main);
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我的动作创作者:
export const authorization = (username, password) => (dispatch) =>
new Promise ((resolve, reject) => {
fetch(url, {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
username: username,
password: password,
})
}).then( response => {
if (response.ok) {
response.json().then( result => {
console.log("API reached.");
dispatch(logUserIn(result.token));
resolve(result);
})
} else {
let error = new Error(response.statusText)
error.response = response
dispatch(showError(error.response.statusText), () => {throw error})
reject(error);
}
});
});
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我的Signin.js组件:
handleSubmit(event) {
event.preventDefault();
this.setState({ isLoading: true })
const { username, password } = this.state;
this.props.onLoginRequest(username, password, this.props.history).then(result => {
console.log("Success. Token: "+result.token); //I do get "success" in console
this.props.history.push('/servers') //Changes address, does not render /servers component
});
}
const mapActionsToProps = {
onLoginRequest: authorization
}
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最奇怪的是,如果我将handleSubmit()方法更改为此,则一切运行正常:
handleSubmit(event) {
event.preventDefault();
this.setState({ isLoading: true })
const { username, password } = this.state;
this.props.onLoginRequest(username, password, this.props.history).then(result => {
console.log("Success. Token: "+result.token);
//this.props.history.push('/servers')
});
this.props.history.push('/servers')
}
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如果我尝试从componentWillReceiveProps(newProps)方法推送历史记录,则会出现相同的问题-它会更改地址,但不会呈现新组件。有人可以解释为什么会发生这种情况以及如何解决吗?
谢谢!
小智 6
您需要申请 withRouter 以在每个使用“push”的组件中使用 this.props.history.push('/page')
import { withRouter } from 'react-router-dom';
.....
export default
withRouter(MoneyExchange);
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这在使用推送时很重要。
如果有人感兴趣-发生这种情况是因为应用程序在推送历史记录之前就已呈现。当我将历史记录推入到动作中,但在将结果转换为JSON之前,它就开始工作,因为现在它会推入历史记录,然后才渲染该应用程序。
export const authorization = (username, password, history) => (dispatch) =>
new Promise ((resolve, reject) => {
fetch(url, {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
username: username,
password: password,
})
}).then( response => {
if (response.ok) {
//################################
//This is where I put it
history.push("/servers");
//################################
response.json().then( result => {
dispatch(logUserIn(result.token));
resolve(result);
})
} else {
let error = new Error(response.statusText)
error.response = response
dispatch(showError(error.response.statusText), () => {throw error})
reject(error);
}
});
});
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首先,使用历史包创建一个历史对象:
// src/history.js
import { createBrowserHistory } from 'history';
export default createBrowserHistory();
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然后将其包装在主路由器组件中。
import { Router, Route, Link } from 'react-router-dom';
import history from './history';
ReactDOM.render(
<Provider store={store}>
<Router history={history}>
<Fragment>
<Header />
<Switch>
<SecureRoute exact path="/" component={HomePage} />
<Route exact path={LOGIN_PAGE} component={LoginPage} />
<Route exact path={ERROR_PAGE} component={ErrorPage} />
</Switch>
<Footer />
</Fragment>
</Router>
</Provider>)
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在这里,发送请求后,重定向到主页。
function requestItemProcess(value) {
return (dispatch) => {
dispatch(request(value));
history.push('/');
};
}
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应该有帮助:)
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