我用creat-react-app创建一个react应用。在我的项目中使用Hooks和Context。 这段代码是我的loginView.js
function LoginView(props) {
const classes = useStyles()
const [Username, setUsername] = useState('');
const [Password, setPassword] = useState('');
const { getUserLogin, isLogin } = useContext(UserContext)
const handelSubmit = (e) => {
console.log(Username, Password)
if (Username.length < 1) {
alert("لطفا نام کاربری را وارد نمایید")
if (Password.length < 1) {
alert("لطفا رمز عبور را واردنمایید")
}
}
let uuid = uuidv1()
console.log(uuid)
localStorage.setItem('myUUID', uuid)
let xml = 'exampel xlm (srver is SOAP)';
console.log(xml)
getUserLogin(xml)
}
useEffect(() => {
if (isLogin) {
props.history.push("/MainPage")
}
}, [isLogin])
return (
<div style={{ direction: 'rtl', }}>
<MyLogo />
<div className={classes.root} >
<div className='textfiled'>
<TextField
className={classes.txt}
name='username'
inputProps={{ style: { textAlign: 'center' } }}
onChange={(e) => setUsername(e.target.value)}
placeholder='نام کاربری' ></TextField>
</div>
<div >
<TextField
className={classes.txt}
inputProps={{ style: { textAlign: 'center' } }}
name='password'
type='password'
onChange={(e) => setPassword(e.target.value)}
placeholder='رمز عبور' ></TextField>
</div>
<div>
<Button color={'inherit'} className={classes.btn} onClick={() => handelSubmit()} > ورود</Button>
</div>
</div>
</div>
)
}
export default withRouter(LoginView);
这是我的上下文:
export const UserContext = createContext()
export const UserContextDispacher = createContext();
const UserProvider = (props) => {
const [user, setUser] = useState({ username: '', password: '', })
const [isLogin, setisLogin] = useState(false)
const getUserLogin = (value) => {
axios.post('https://exampel.com/myexampel.asmx', value, { headers: { 'Content-Type': 'text/xml;charset=UTF-8' } }).then(function (response) {
// console.log(response)
var options = {
attributeNamePrefix: "@_",
attrNodeName: "attr", //default is 'false'
textNodeName: "#text",
ignoreAttributes: true,
ignoreNameSpace: false,
allowBooleanAttributes: false,
parseNodeValue: true,
parseAttributeValue: false,
trimValues: true,
cdataTagName: "__cdata", //default is 'false'
cdataPositionChar: "\\c",
localeRange: "", //To support non english character in tag/attribute values.
parseTrueNumberOnly: false,
attrValueProcessor: a => he.decode(a, { isAttributeValue: true }),//default is a=>a
tagValueProcessor: a => he.decode(a) //default is a=>a
};
// Intermediate obj
var tObj = parser.getTraversalObj(response.data, options);
var jsonObj = parser.convertToJson(tObj, options);
//set Token
var token = jsonObj["soap:Envelope"]["soap:Body"].AuthenticateUserResponse.Token
var authResult = jsonObj["soap:Envelope"]["soap:Body"].AuthenticateUserResponse.AuthenticateUserResult
if (authResult != false) {
localStorage.setItem('mytoken', token)
localStorage.setItem('myisLogin', authResult)
setisLogin(true)
} else {
localStorage.setItem('myisLogin', authResult)
setisLogin(false)
}
return authResult
}).catch(function (error) {
// console.log("erorr in send to login : " + error)
})
}
return (
<UserContext.Provider value={{ user, getUserLogin, isLogin }}>
<UserContextDispacher.Provider>
{props.children}
</UserContextDispacher.Provider>
</UserContext.Provider>
)
}
export default withRouter(UserProvider);
在useEffect控制台中登录(单击提交按钮)后。log(isLogin)多次(25次!!)这是我的控制台的屏幕截图
并收到此错误:已超过最大更新深度。 我读了这些帖子,但没有回答 useEffect React Hook rendering multiple times with async await (submit button)
为什么会这样? 更新 这是我的App.js文件:
return (
<UserProvider>
<div className={classes.root} >
<Route exact path="/" component={LoginView} />
<CarsContextProvider>
<InfoContextProvider>
<Switch>
{
routersMyCard.map((route) => (
route.private ? <PrivateRoute {...route} /> :
<Route {...route} />
))
}
</Switch>
</InfoContextProvider>
</CarsContextProvider>
<AddToHomescreen title={'برای استفاده بهتر از این برنامه اینجا را کلیک کنید و مراحل را دنبال نمایید'} onAddToHomescreenClick={handleAddToHomescreenClick} />
</div>
</UserProvider>
);
这是我的私人溃败:
const isLoginLocal = localStorage.getItem('myisLogin')
function PrivateRoute(props) {
return isLoginLocal? <Route {...props}/> : <Redirect to="/"/>
}