react-router

问题 I have react class that is rendered using react router. I understand that React.cloneElement is used to pass elements from parent to child. But why/what does the '&&' operator do with this kind of statement : class Users extends React.Component { getInitialState() { return { page:0 } }, foo(){ this.setState({'page':1}) } render() { return ( <div> <h2>Users</h2> { this.props.children && React.cloneElement(this.props.children, { foo:this.foo}) </div> ) } } I would like to understand why are we

问题 I have react class that is rendered using react router. I understand that React.cloneElement is used to pass elements from parent to child. But why/what does the '&&' operator do with this kind of statement : class Users extends React.Component { getInitialState() { return { page:0 } }, foo(){ this.setState({'page':1}) } render() { return ( <div> <h2>Users</h2> { this.props.children && React.cloneElement(this.props.children, { foo:this.foo}) </div> ) } } I would like to understand why are we

问题 I am working with React-Router in React-JS: The <Route> is an built in component and have two different props: exact and strict Problem The documentation does not clearly defines the differences in between the exact and strict . Kindly help me. The document is very confusing and not clear at that point. 回答1: Use case 1 If you use exact and strict together, then the location.pathname will only match exactly as provided in path props. Example: <Route exact strict path="/one" component={About}/>

问题 I repeatedly get a Could not find router reducer in state tree, it must be mounted under "router" error when I do a dispatch(push("/")); call. index.tsx const store = configureStore(); ReactDOM.render( <Provider store={store}> <ConnectedRouter history={history}> <Switch> <Route exact path="/" component={HomeScreenContainer} /> <Route exact path="/login" component={LoginScreenContainer} /> </Switch> </ConnectedRouter> </Provider>, document.getElementById('root'), ); configureStore.ts export

问题 i am trying to build basic e-cart. My problem is that during sign up , information coming from the server is store in redux store and i also store in localstorage , it also save there , but sign up page is not redirecting to home page , in case of successful sign up. Here i am applying logic that if user is not null in store than it should be redirected to home page. It is only working when i manually refresh page , and then all time it works fine. So how to deal with this problem? Here is my

问题 I have a NavLink which have child components <NavLink className={StyledAppNavItem} activeClassName={StyledAppNavItemActive} to={link.path} > <Icon size={28} icon={link.icon} color={isActive?'red':'blue'}/> <StyledAppNavName>{link.name}</StyledAppNavName> </NavLink> Like activeClassName is attached when the link is active, I need to detect if this link is active and send a prop to its child component Icon Somewhat like <Icon color={linkisActive?'red':'blue'}/> 回答1: Unfortunately, there is no

问题 When route(react-route) changing, how can I load or remove the styles relevant to the new page? I really don't know who is in charge of this function , react or webpack or react-router. But now, when the home page loaded, all of the styles in project will load, how could I do? Routes: <Router history={hashHistory}> <IndexRoute component={HomePage}/> <Route path="/page1" component={Page1}/> <Route path="/page2" component={Page2}/> </Router> Page1: import './page1style.css'; export default

问题 I faced with problem that React didnt wait evalating values. I have about 10 GET requests in useEffect and then placing it on hook state: const [data,setData]=useState() useEffect(async()=>{ //here axios requests setData('here retrieved data above'); },[]); I wrapped in async function but it not helping and my react code starting without data from axios requests, but at console i see data from every request with mark "value below was evaluated just now". How I can wait for evaluating? As I

问题 About: Hey there, at the moment I am trying to write tests with jest and the react testing library for my react components. I also use react-router. The Problem: I want to check if the app routes to the right component when the path changes without interacting with the single components. So for example, if the current pathname is "/impressum" I want to have a Snapshot from just the Impressum page. I cannot figure out how to pass the path to <App> so that only one Route is displayed. The

问题 About: Hey there, at the moment I am trying to write tests with jest and the react testing library for my react components. I also use react-router. The Problem: I want to check if the app routes to the right component when the path changes without interacting with the single components. So for example, if the current pathname is "/impressum" I want to have a Snapshot from just the Impressum page. I cannot figure out how to pass the path to <App> so that only one Route is displayed. The