我正在从头开发 Reactjs Web 应用程序,遇到了一个需要帮助的棘手情况。每当我离开特定 url 并返回时,我的 redux 商店似乎没有连接。
路由.js
const RouteList = () => (
<main>
<Switch>
<Route path="/abc/" exact component={withRouter(HomePage)} />
<Route path="/abc/xyz" exact component={withRouter(XYZPage)} />
<Redirect from="/" to="/abc/" />
<Route component={Error} />
</Switch>
</main>
);
export default RouteList;
应用程序.js
class App extends React.Component {
constructor(props) {
super(props);
this.state = {};
}
render () {
return (
<Router history={browserHistory}>
<div>
<Header />
<RouteList />
<Footer />
</div>
</Router>
);
}
}
export default App;
头文件.js
const Header = () => {
return (
<Navbar expand="md">
<NavbarBrand tag={NavLink} to="/">
<img src={brandImage} style={{marginRight: "0", width: "40px", height: "40px"}} /><strong style={{color: "#457B9D"}} >Datum</strong>
</NavbarBrand>
<Nav className="mr-auto" navbar>
<NavItem>
<NavLink className="nav-link" to={"/abc/xyz"} >XYZ</NavLink>
</NavItem>
</Nav>
</Navbar>
);
};
export default withRouter(Header);
当我点击 NavLink 时,它将带我到 url:/"abc/xyz",它会带我到 XYZPage.js
XYZPage.js
class XYZPage extends React.Component {
constructor(props, context) {
super(props, context);
this.state = {
activeTab: "1"
};
this.toggle = this.toggle.bind(this);
}
toggle(tab) {
if (this.state.activeTab !== tab) {
this.setState({
activeTab: tab
});
}
}
render () {
return (
<main>
<div className="container-fluid pt-3">
<Nav tabs>
<NavItem>
<NavLink
className={classnames({active: this.state.activeTab === "1"})}
onClick={() => {this.toggle("1"); }} >
AAA
</NavLink>
</NavItem>
<NavItem>
<NavLink
className={classnames({active: this.state.activeTab === "2"})}
onClick={() => {this.toggle("2"); }} >
BBB
</NavLink>
</NavItem>
<NavItem>
<NavLink
className={classnames({active: this.state.activeTab === "3"})}
onClick={() => {this.toggle("3"); }} >
CCC
</NavLink>
</NavItem>
</Nav>
<TabContent activeTab={this.state.activeTab}>
<TabPane tabId="1">
<Row>
<AAAPAge/>
</Row>
</TabPane>
<TabPane tabId="2">
<Row>
<BBBPage/>
</Row>
</TabPane>
<TabPane tabId="3">
<Row>
<CCCPage/>
</Row>
</TabPane>
</TabContent>
</div>
</main>
);
}
}
export default withRouter(XYZPage);
每个 AAAPage、BBBPage 和 CCCPage 都是需要预先填充下拉列表的组件,我在下面的 index.js 中声明了这些下拉列表:
索引.js
const store = configureStore();
store.dispatch(loadAAA());
store.dispatch(loadBBB());
store.dispatch(loadCCC());
render((
<Provider store={store}>
<BrowserRouter>
<App />
</BrowserRouter>
</Provider>
), document.getElementById('app'));
loadAAA、loadBBB 和 loadCCC 都是 thunk
configureStore() 方法是这样的:
export default function configureStore(initialState) {
return createStore(
rootReducer,
initialState,
composeWithDevTools(
applyMiddleware(thunk, reduxImmutableStateInvariant()),
)
);
}
为了缩短这篇文章,我给出了我的 AAAPage 的样本,因为其他人的结构相似:
AAAPage.js:
class AAAPage extends React.Component {
constructor(props, context) {
super(props, context);
this.state = {...};
}
componentWillReceiveProps(nextProps) {...}
render() {
[...]
return (
<Container fluid>
<Row>
<AAAInputForm
// Data from Store is passed here
/>
</Row>
{ChildComponent}
</Container>
);
}
}
AAAPage.propTypes = {
DATA: PropTypes.array
};
function mapStateToProps(state, ownProps) {
let DATA = [];
if (state.AAAReducer.length > 0) {
DATA = state.AAAReducer;
}
return {
DATA: DATA
};
}
export default withRouter(connect(mapStateToProps)(AAAPage));
AAAReducer.js:
export default function AAAReducer(state=initialState.AAAList, action) {
switch(action.type) {
case types.LOAD_AAA_SUCCESS:
return action.AAAList;
default:
return state;
}
}
AAAAction.js:
export function loadAAASuccess(AAAList) {
return {
type: types.LOAD_AAA_SUCCESS,
AAAList: AAAlList
};
}
// thunk
export function loadAAA() {
// A thunk will always return a function that accepts a dispatch
return function(dispatch) {
return apiCall("ALL").then(response => {
dispatch(loadAAASuccess(response.data.AAA));
}).catch(error => {
throw(error);
});
};
}
初始状态.js:
export default {
AAAList: [],
BBBList: [],
CCCList: []
};
在这一点上,我相信我为我的代码提供了足够的背景知识。我在设计这个 redux 商店时遵循了教程,但我不确定为什么当我从“/abc/xyz”导航到“/abc”并返回时,或者当我从“/abc”导航到“/abc/xyz”时,我的尽管我在 index.js 中调用了 loadAAA() 方法,但商店是空的。所有其他页面也受到影响。但是,当我直接点击“/abc/xyz”时,我的商店已连接并且我的下拉列表已填充。怎么了?是不是因为我的生命周期方法?
我正在使用 react v15.6.2、redux v3.7.2 和 redux-thunk v2.3.0。
感谢您的指导。