Dispatch not changing redux state - reactjs

Question

I am fairly new to redux, and I am running into a problem.
I am trying to implement flash messages to my login page, but redux's dispatch is not changing the UI State.
I want a flash message to appear on the login page after user successfully register.
//login.js
class Login extends Component{
renderMessage() {
if (this.props.flashMessageType== "registrationComplete"){
return (
<Message
style={{textAlign: "left"}}
success
icon="check circle"
header="Account Registration was Successful"
list={["You must verify your email before logging in"]}
/>
);
} else {
return (null);
}
}
render() {
return ({
this.renderMessage()
});
}
}
function mapStateToProps(state) {
return {
flashMessageType:state.flashMessage.flashType,
};
}
export default connect(mapStateToProps, actions)(Login);
Here is the reducer
const initialState = {
flashType: "",
};
export default function(state = {initialState}, action){
switch(action.type){
case USER_REGISTER:
return [
...state,
{
flashType:"registrationComplete"
}
];
default:
return initialState;
}
}
and here is the actions
export const submitForm = (values,history) => async dispatch => {
const res = await axios.post('/api/signup', values);
history.push('/');
dispatch({type: FETCH_USER, payload: res.data});
dispatch({type: USER_REGISTER});
};
I appreciate your help.
Thanks,
Vincent

Answer 1

As Amr Aly mentioned (and now soroush), you're essentially mutating the state when you do:
return[ ...state, { flashType:"registrationComplete" }]
What you really want is:
return { ...state, flashMessage: "registrationComplete" }
Also, some of your code is a bit redundant and/or missing some important instructions (like try/catch blocks).
What your code should look like:
FlashMessage.js
import React, { PureComponent } from 'react';
import Message from '../some/other/directory';
import actions from '../some/oter/directory':
class Login extends PureComponent {
render = () => (
this.props.flashMessage == "registrationComplete"
? <Message
style={{textAlign: "left"}}
success
icon="check circle"
header="Account Registration was Successful"
list={["You must verify your email before logging in"]}
/>
: null
)
}
export default connect(state => ({ flashMessage: state.auth.flashMessage }), actions)(Login)
reducers.js
import { routerReducer as routing } from 'react-router-redux';
import { combineReducers } from 'redux';
import { FETCH_USER, USER_REGISTER } from '../actions/types';
const authReducer = (state={}, ({ type, payload }) => {
switch(type){
case FETCH_USER: return { ...state, loggedinUser: payload };
case USER_REGISTER: return { ...state, flashMessage: "registrationComplete" }
default: return state;
}
}
export default = combineReducers({
auth: authReducer,
routing
});
actions.js
import { FETCH_USER, USER_REGISTER } from './types';
export const submitForm = (values,history) => async dispatch => {
try {
const {data} = await axios.post('/api/signup',values);
dispatch({ type:FETCH_USER, payload: data });
dispatch({ type:USER_REGISTER });
history.push('/');
catch (err) {
console.error("Error: ", err.toString());
}
};

Answer 2

Your reducer should be:
const initialState = {
flashType: "",
};
export default function(state = initialState, action){
switch(action.type){
case USER_REGISTER:
return {
...state,
flashType: "registrationComplete",
};
default:
return state;
}
}