React/Redux not updating the state - reactjs

Question

I'm just starting in redux and I want to include it on my existing app. What I want to do is to store my login response for me to use the user details on other page.
LandingPage.js
import { useDispatch } from 'react-redux'
function LandingPage(){
const dispatch = useDispatch();
const authLogin = async()=>{
const response = await axios.get('/api',)
let responseValue = response.data.success
if(responseValue === true) {
const parsedData = JSON.parse(response.data.resp)
dispatch({
type: 'SAVE_AUTH',
payload: {
isLoggedIn: responseValue,
username: parsedData.data.user.userName,
token: parsedData.data.token
}
})
}
useEffect(() => {
authLogin();
}, [])
return (
<div>
<label>Authenticating....</label>
<Login1 /> //updated based on #LindaPaiste's answer
</div>
export default LandingPage;
MainLanding.js
import React from 'react'
import Login1 from './Login1'
function MainLanding(){
return(
<div>
<h1>User Login Details</h1>
<Login1 /> //Nothing hapens here
</div>
)
}
export default MainLanding;
Login1.js
import React from 'react'
import LoginDetailsx from './LoginDetailsx'
import { useSelector } from 'react-redux'
function Login1(){
const userLoginDetails = useSelector((state) => state.loginDetails)
console.log('userLoginDetails',userLoginDetails)
return(
<div>
<h2>Login Details</h2>
<LoginDetailsx isLogin={userLoginDetails.isLoggedIn} username={userLoginDetails.username} token={userLoginDetails.token}/>
})}
</div>
)}
export default Login1;
loginDetailsReducer.js
const initialState = [
{
isLoggedIn: false,
}];
const loginDetailsReducer = (state = initialState, action) => {
const { type, payload } = action;
console.log('typex',type)
console.log('payloadx',payload)
switch(type){
case "SAVE_AUTH":
alert('dasdasd')
return payload;
case "LOGOUT_AUTH":
return initialState
default:
return state;
}
}
export default loginDetailsReducer;
rootReducer.js
import { combineReducers } from 'redux'
import loginDetailsReducer from '../reduxReducers/loginDetailsReducer'
const rootReducer = combineReducers({
loginDetails: loginDetailsReducer
});
export default rootReducer;
store.js
import { createStore } from 'redux'
import rootReducer from '../reduxReducers/rootReducer'
const store = createStore(rootReducer);
export default store;
LoginDetailsx.js
import React from 'react'
function LoginDetailsx(props){
return(
<div>
<p>Details: isloggedin: {props.isloggedin}, username: {props.username}, token: {props.token}</p>
</div>
)
}
export default LoginDetailsx;
This is what I'm getting on MainLanding.js after successful login.
and this is what i'm getting on LandingPage.js console.log

Answer 1

State Shape
While not necessarily a problem, it really doesn't make sense that the loginDetails state should be an array. Only one user should be logged in at a time, so it should just be an object with the user details. That makes your reducer extremely simple (as always Redux Toolkit can make it even simpler).
You'll want to add a logout case too. isLoggedIn should be a boolean instead of a string. I personally think that undefined makes more sense than '' for username and token when there is no logged in user but that's up to you.
const initialState = {
isLoggedIn: false,
// no username or token when logged out
};
const loginDetailsReducer = (state = initialState, action) => {
const { type, payload } = action;
switch(type) {
case "SAVE_AUTH":
// replace the state with the action payload
return payload;
case "LOGOUT_AUTH":
// revert to initial state
return initialState;
default:
return state;
}
}
export default loginDetailsReducer;
Logging In
I was going to say that asynchronous actions like API calls need to be done inside a useEffect hook in the component. You can use an empty dependency array to run the effect once when the component is mounted.
useEffect(() => {
authLogin();
}, []);
But now I'm looking at your image and it seems like you are executing the action in response to a button click, so that's fine too.
axios handles JSON parsing so you should not need to use JSON.parse() (unless your API is returning strange data).
function MainLanding() {
const isLoggedIn = useSelector((state) => state.loginDetails.isLoggedIn);
// access dispatch function
const dispatch = useDispatch();
// define the function to log in
const authLogin = async () => {
const response = await axios.get("/api");
const data = response.data;
if (data.success === true) {
dispatch({
type: "SAVE_AUTH",
payload: {
isLoggedIn: true,
username: data.resp.user.userName,
token: data.resp.data.token
}
});
}
};
return (
<div>
{isLoggedIn ? (
<>
<h1>User Login Details</h1>
<Login1 />
</>
) : (
<button onClick={authLogin}>Log In</button>
)}
</div>
);
}