Javascript 基于布尔变量的条件路由
我对这一行有疑问:Javascript 基于布尔变量的条件路由,javascript,reactjs,ionic-framework,routes,Javascript,Reactjs,Ionic Framework,Routes,我对这一行有疑问: <Route path="/" render={() => isReg ? <Registro />: <Home /> } /> isReg?:}/> 我得到的是: JSX元素类型“element | undefined”不是构造函数 对于JSX元素。类型“未定义”不可分配给类型 “元素|空”。TS2605 我想做的是确认用户是否已注册isReg变量,如果已注册,则必须显示“/home”,否则显示“/Regi
<Route path="/" render={() => isReg ? <Registro />: <Home /> } />
isReg?:}/>
我得到的是:
JSX元素类型“element | undefined”不是构造函数
对于JSX元素。类型“未定义”不可分配给类型
“元素|空”。TS2605
我想做的是确认用户是否已注册isReg变量,如果已注册,则必须显示“/home”,否则显示“/Registro”
但我无法修复条件路由语句。我将非常感谢你的帮助。提前谢谢
const App: React.FC = () => {
const [isReg, setIsReg] = useState(false);
useEffect(() => {
if(getItem("isRegistered2")==null){
console.log(getItem("isRegistered2"));
setIsReg(true);
}
else{
setIsReg(false);
}
}, []);
return(
<IonApp>
<IonReactRouter>
<IonSplitPane contentId="main" when="(min-width: 4096px)">
<Menu />
<IonRouterOutlet id="main">
<Route path="/" render={() => isReg ? <Registro />: <Home /> } />
<Route path="/registro" component={Registro} exact={true}></Route>
<Route path="/ingresar" component={Ingresar} exact={true}></Route>
<Route path="/MisServicios" component={MisServicios} exact={true}></Route>
<Route path="/Favoritos" component={Favoritos} exact={true}></Route>
<Route path="/HistorialServicios" component={HistorialServicios} exact={true}></Route>
<Route path="/Completarinfo" component={Completarinfo} exact={true} />
<Route path="/Login" component={Login} exact={true} />
<Route path="/tab2" component={Tab2} exact={true} />
</IonRouterOutlet>
</IonSplitPane>
</IonReactRouter>
</IonApp>
);
};
export default App;
const-App:React.FC=()=>{
const[isReg,setIsReg]=useState(false);
useffect(()=>{
if(getItem(“isRegistered2”)==null){
日志(getItem(“isRegistered2”);
setIsReg(真);
}
否则{
setIsReg(假);
}
}, []);
返回(
isReg?:}/>
);
};
导出默认应用程序;
英格拉斯
我认为问题在于家庭部分。因为如果我把家换成另一个组件,我就没有问题了。我在家里看到的不同之处是它有一个模态
Home.tsx
const Home = () => {
const [showModal, setShowModal] = useState({ isOpen: false });
const [retVal, setRetVal] = useState(null);
const [count, setCount] = useState(0);
const [login, setLogin]=useState(0);
const axios = require('axios');
const data2 = getLocation();
if(getItem("isRegistered")!=null){
console.log(getItem("isRegistered"));
setLogin(1);
}
else{
setLogin(0);
}
data2.then((value)=>{
console.log(url+value);
axios.get(url+value).then((resp: { data: any; }) => {
console.log(resp.data);
});
})
if(login===1){
return (
<IonPage>
<IonHeader>
<IonToolbar>
<IonGrid>
<IonRow id="header">
<IonCol id="columna" size="1.5"><IonButtons ><IonMenuButton /> </IonButtons></IonCol>
<IonCol id="columna2" ><Busqueda /></IonCol>
<IonCol id="columna3" size="2">
<IonChip onClick={() => { setShowModal({ isOpen: true}); setCount(0)}}id="user" >
<IonIcon icon={person} id="foto-usuario"/>
</IonChip>
</IonCol>
</IonRow>
</IonGrid>
</IonToolbar>
</IonHeader>
<IonContent className="ion-padding">
<IonModal
animated={true}
isOpen={showModal.isOpen}
onDidDismiss={() => setShowModal({ isOpen: false })}
>
<MyModal
tipo={count}
onClose={(value: React.SetStateAction<null>) => {
setShowModal({ isOpen: false });
value ? setRetVal(value) : setRetVal(null);
}}
/>
</IonModal>
<IonGrid>
<IonRow>
<IonCol>
<div id="contenedor-prueba">
<IonChip className="boton-generales" onClick={() => { setShowModal({ isOpen: true}); setCount(1)}}>
<IonLabel ><small>Emergencias</small></IonLabel>
<IonAvatar> <img src={"./assets/icon/sirena.png"} className="imagen-boton-principal"/></IonAvatar>
</IonChip>
</div>
</IonCol>
<IonCol>
<div id="contenedor-prueba">
<IonChip className="boton-generales" onClick={() => { setShowModal({ isOpen: true}); setCount(2)}}>
<IonLabel><small>Categorías</small></IonLabel>
<IonAvatar> <img src={"./assets/icon/servicio.png"} className="imagen-boton-principal"/></IonAvatar>
</IonChip>
</div>
</IonCol>
<IonCol>
<div id="contenedor-prueba">
<IonChip className="boton-generales" onClick={() => { setShowModal({ isOpen: true}); setCount(3)}}>
<IonLabel><small>Programado</small></IonLabel>
<IonAvatar> <img src={"./assets/icon/time.png"} className="imagen-boton-principal"/></IonAvatar>
</IonChip>
</div>
</IonCol>
</IonRow>
</IonGrid>
<ExploreContainer />
</IonContent>
</IonPage>
);
}
};
const MyModal: React.FC<{onClose: any; tipo: number;}> = ({ onClose, tipo }) => {
if(tipo===0){
return (
<>
<IonHeader>
<IonToolbar>
<IonIcon icon={arrowBack} onClick={() => onClose(null)} slot="start" id="flecha-volver"> </IonIcon>
</IonToolbar>
</IonHeader>
<IonContent>
<div id="contenedor-central">
<br></br>
<IonButton href="/ingresar" id="botoningresoregistro">INGRESAR</IonButton>
<IonButton href="/registro" id="botoningresoregistro">REGISTRARSE</IonButton>
</div>
</IonContent>
</>
);
}
if(tipo===1){
return (
<>
<IonHeader>
<IonToolbar>
<IonIcon icon={arrowBack} onClick={() => onClose(null)} slot="start" id="flecha-volver"> </IonIcon>
</IonToolbar>
</IonHeader>
<IonContent>
<div id="contenedor-central">
<strong>Emergencias</strong>
</div>
</IonContent>
</>
);
}
if(tipo===2){
return (
<>
<IonHeader>
<IonToolbar>
<IonIcon icon={arrowBack} onClick={() => onClose(null)} slot="start" id="flecha-volver"> </IonIcon>
</IonToolbar>
</IonHeader>
<IonContent>
<div id="contenedor-central">
<strong>Categorías</strong>
</div>
</IonContent>
</>
);
}
else{
return (
<>
<IonHeader>
<IonToolbar>
<IonIcon icon={arrowBack} onClick={() => onClose(null)} slot="start" id="flecha-volver"> </IonIcon>
</IonToolbar>
</IonHeader>
<IonContent>
<div id="contenedor-central">
<strong>Programados</strong>
</div>
</IonContent>
</>
);
}
};
class Modal extends Component{
constructor(props: Readonly<{}>) {
super(props);
this.handleClick = this.handleClick.bind(this);
}
handleClick() {
console.log('Se hizo click');
}
render() {
return <button onClick={this.handleClick}>Clickéame</button>;
}
}
class Busqueda extends Component{
Buscar = () =>{
var input=(document.getElementById("busqueda") as HTMLTextAreaElement).value;
if(input==="hola"){
console.log("hola perri");
}
}
render(){
return(<IonSearchbar type="text" placeholder="¿Qué servicios buscas?" onIonInput={this.Buscar} id="busqueda"></IonSearchbar>);
}
};
export default Home;
const Home=()=>{
const[showmodel,setshowmodel]=useState({isOpen:false});
const[retVal,setRetVal]=useState(null);
const[count,setCount]=useState(0);
const[login,setLogin]=useState(0);
const axios=require('axios');
const data2=getLocation();
如果(getItem(“isRegistered”)!=null){
日志(getItem(“isRegistered”);
setLogin(1);
}
否则{
setLogin(0);
}
数据2.然后((值)=>{
console.log(url+值);
get(url+value).then((resp:{data:any;})=>{
控制台日志(相应数据);
});
})
如果(登录===1){
返回(
{setShowModal({isOpen:true});setCount(0)}}id=“user”>
setShowModal({isOpen:false}}
>
{
setShowModal({isOpen:false});
值?setRetVal(值):setRetVal(空);
}}
/>
{setShowModal({isOpen:true});setCount(1)}>
紧急情况
{setShowModal({isOpen:true});setCount(2)}>
分类
{setShowModal({isOpen:true});setCount(3)}>
程序设计
);
}
};
常量MyModal:React.FC=({onClose,tipo})=>{
如果(tipo==0){
返回(
onClose(null)}slot=“start”id=“flecha volver”>
安格尔
注册人
);
}
如果(tipo==1){
返回(
onClose(null)}slot=“start”id=“flecha volver”>
紧急情况
);
}
如果(tipo==2){
返回(
onClose(null)}slot=“start”id=“flecha volver”>
类别
);
}
否则{
返回(
onClose(null)}slot=“start”id=“flecha volver”>
程序设计
);
}
};
类模态扩展组件{
构造函数(道具:只读){
超级(道具);
this.handleClick=this.handleClick.bind(this);
}
handleClick(){
log('Se hizo click');
}
render(){
返回Clickéame;
}
}
类Busqueda扩展了组件{
公共汽车=()=>{
var输入=(document.getElementById(“busqueda”)作为HTMLTextAreaElement)。值;
如果(输入==“hola”){
console.log(“hola perri”);
}
}
render(){
return();
}
};
导出默认主页;
像这样使用它:
const [isReg, setIsReg] = useState();
{isReg != undefined && <Route path="/" render={() => isReg ? <Registro />: <Home/>} />
初始化未定义的状态,如下所示:
const [isReg, setIsReg] = useState();
{isReg != undefined && <Route path="/" render={() => isReg ? <Registro />: <Home/>} />
然后动态创建路由,如下所示:
const [isReg, setIsReg] = useState();
{isReg != undefined && <Route path="/" render={() => isReg ? <Registro />: <Home/>} />
{isReg!=未定义&isReg?:}/>
定义一个处理条件呈现的新组件。isReg状态不应位于App.js内
AppReg.js
const AppReg: React.FC = () => {
const [isReg, setIsReg] = useState(null);
useEffect(() => {
if (getItem('isRegistered2') == null) {
console.log(getItem('isRegistered2'));
setIsReg(true);
} else {
setIsReg(false);
}
}, []);
if (isReg == null) {
return <Loader />;
}
if (isReg === true) {
return <Registro />;
} else {
return <Home />;
}
};
export default AppReg;
const AppReg:React.FC=()=>{
const[isReg,setIsReg]=useState(null);
useffect(()=>{
if(getItem('isRegistered2')==null){
log(getItem('isRegistered2');
setIsReg(真);
}否则{
setIsReg(假);
}
}, []);
如果(isReg==null){
返回;
}
如果(isReg==真){
返回;
}否则{
返回;
}
};
出口违约处理;
App.js
const App: React.FC = () => {
return (
<IonApp>
<IonReactRouter>
<IonSplitPane contentId="main" when="(min-width: 4096px)">
<Menu />
<IonRouterOutlet id="main">
<Route path="/" component={AppReg} />
<Route path="/registro" component={Registro} exact={true}></Route>
<Route path="/ingresar" component={Ingresar} exact={true}></Route>
<Route path="/MisServicios" component={MisServicios} exact={true}></Route>
<Route path="/Favoritos" component={Favoritos} exact={true}></Route>
<Route path="/HistorialServicios" component={HistorialServicios} exact={true}></Route>
<Route path="/Completarinfo" component={Completarinfo} exact={true} />
<Route path="/Login" component={Login} exact={true} />
<Route path="/tab2" component={Tab2} exact={true} />
</IonRouterOutlet>
</IonSplitPane>
</IonReactRouter>
</IonApp>
);
};
export default App;
const-App:React.FC=()=>{
返回(
);
};
导出默认应用程序;
更新:主组件需要在默认情况下返回null。谢谢,但我仍然有at返回语句(在AppReg.tsx中,问题似乎出在主组件):JSX元素类型“element | undefined”不是JSX元素的构造函数。类型“未定义”不可分配给类型“Element | null”。太奇怪了。您是否也实现了加载器组件?如果不是,请尝试在那里返回null以进行测试。返回主组件为=>返回为元素。否则,家将返回未定义,这似乎是问题所在。试着从家里返回null来测试东西。啊!只是看着