Reactjs API使用React Redux钩子重复调用?
我将redux hooks saga与API集成,我想加载一次项目并监听更改,API不断被调用:Reactjs API使用React Redux钩子重复调用?,reactjs,api,redux,react-hooks,saga,Reactjs,Api,Redux,React Hooks,Saga,我将redux hooks saga与API集成,我想加载一次项目并监听更改,API不断被调用: import { loadProjects } from '../../store/actions'; useEffect(() => { props.loadProjects(); }, []); return (<React.Fragment>...</React.Fragment>) const mapStatetoProps = state =&
import { loadProjects } from '../../store/actions';
useEffect(() => {
props.loadProjects();
}, []);
return (<React.Fragment>...</React.Fragment>)
const mapStatetoProps = state => state.Projects;
export default connect( mapStatetoProps, { loadProjects })(InvoicesList);
此片段位于index.js->App.js->project.js中
import store from './store';
const app = (
<Provider store={store}>
<BrowserRouter>
<App />
</BrowserRouter>
</Provider>
);
ReactDOM.render(app, document.getElementById('root'));
serviceWorker.unregister();
从“/store”导入存储;
常量应用=(
);
render(app,document.getElementById('root');
serviceWorker.unregister();
这是App.js代码
return (
<React.Fragment>
<Router>
<Switch>
{userRoutes.map((route, idx) => (
<Authmiddleware
path={route.path}
layout={Layout}
component={route.component}
key={idx}
/>
))}
</Switch>
</Router>
</React.Fragment>
);
}
const mapStateToProps = state => {
return {
layout: state.Layout
};
};
export default connect(mapStateToProps, null)(App);
返回(
{userRoutes.map((route,idx)=>(
))}
);
}
常量mapStateToProps=状态=>{
返回{
布局:state.layout
};
};
导出默认连接(MapStateTops,null)(应用程序);
我们可以看到带有«项目列表»案例的减速机吗?如果useffect
具有空依赖项,这意味着它仅在组件装载时触发一次。如果一次又一次地调用该组件,则表示该组件正在卸载并再次安装。什么是渲染此组件?(与先前请求的reducer代码一起)您需要使用mapDispatchToProps进行redux操作
return (
<React.Fragment>
<Router>
<Switch>
{userRoutes.map((route, idx) => (
<Authmiddleware
path={route.path}
layout={Layout}
component={route.component}
key={idx}
/>
))}
</Switch>
</Router>
</React.Fragment>
);
}
const mapStateToProps = state => {
return {
layout: state.Layout
};
};
export default connect(mapStateToProps, null)(App);