如何解决无法读取未定义的属性“isAuthenticated”
TypeError: 无法读取未定义的属性“isAuthenticated” Function.mapStatetoProps [作为 mapToProps] E:/smnd/client/src/components/auth/Login.js:69
function mapStatetoProps (state){
return{
isAuthenticated: state.auth.isAuthenticated
}
}
这是Login.js的代码
import React,{Fragment,useState } from 'react';
import {Link,Redirect} from 'react-router-dom';
import {connect} from 'react-redux';
import PropTypes from 'prop-types';
import {login} from '../../actions/auth';
// import {isAuthenticated} from '../../reducers/auth';
const Login = ({login,isAuthenticated}) => {
const [formData,setFormData] = useState({
email: '',password: ''
});
const { email,password} = formData;
const onChange = e => setFormData({ ...formData,[e.target.name]: e.target.value });
const onSubmit = async e => {
e.preventDefault();
login(email,password);
};
// redirected if logged in
if (isAuthenticated) {
return <Redirect to='/dashboard' />;
}
return (
<Fragment>
<h1 className="large text-primary">Sign In</h1>
<p className="lead"><i className="fas fa-user"></i> Sign Into Your Account</p>
<form className="form" onSubmit={e => onSubmit(e)}>
<div className="form-group">
<input type="email" placeholder="Email Address" name="email" value={email} onChange={ e => onChange(e)} />
</div>
<div className="form-group">
<input
type="password"
placeholder="Password"
name="password"
value={password}
onChange={ e => onChange(e)}
/>
</div>
<input type="submit" className="btn btn-primary" value="Login" />
</form>
<p className="my-1">
Don't have an account? <Link to="/register">Sign Up</Link>
</p>
</Fragment>
);
};
Login.propTypes = {
login: PropTypes.func.isrequired,isAuthenticated: PropTypes.bool
}
// const mapStatetoProps = state => ({
// isAuthenticated: state.auth.isAuthenticated
// });
function mapStatetoProps (state){
return{
isAuthenticated: state.auth.isAuthenticated
}
}
export default connect(mapStatetoProps,{login}) (Login);
解决方法
因为你没有在 redux store 中设置 auth
的初始状态。所以你需要像这样添加可选的链接:
isAuthenticated: state.auth?.isAuthenticated
,
确保在 redux store 的 login reducer 中,您提供了“isAuthenticated”作为初始状态,如下所示..
const initialState = { isAuthenticated:假, };
function loginReducer(state = initialState,action){ .... }
如果您为您的 redux 存储使用多个reducer,还要确保您在“combineReducers”函数中包含了 loginReducer
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