Use redux action the dispatch is not working - react-native

Question

I have combined my react redux.
Here is my App.js
import React from 'react';
import ReduxThunk from 'redux-thunk';
import { Provider } from 'react-redux';
import { compose, createStore, applyMiddleware } from 'redux';
import reducers from './src/reducers';
import AppContainer from './src/navigator'
const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
const App: () => React$Node = () => {
const store = createStore(reducers, {}, composeEnhancers(applyMiddleware(ReduxThunk)));
return (
<Provider store={store}>
<AppContainer />
</Provider>
);
};
export default App;
src/reducers/index.js
import { combineReducers } from 'redux';
import LoginReducer from './LoginReducer';
export default combineReducers({
LoginRedux: LoginReducer
});
If I use my action login(), I can see login action start, but I can't see dispatch start
import React from 'react';
import {
Text,
View,
TouchableOpacity,
} from 'react-native';
import { connect } from 'react-redux';
import { login } from '../actions';
const LoginScreen = ({ navigation }) => {
// console.log('see my test value', testValue)
return (
<View>
<TouchableOpacity
onPress={() => {
login();
}
}>
<View>
<Text>LOGIN</Text>
</View>
</TouchableOpacity>
</View>
</View>
);
}
const mapStateToProps = (state) => {
const { testValue } = state.LoginRedux;
console.log('mapStateToProps testValue =>', testValue);
return { testValue };
};
export default connect(mapStateToProps, { login })(LoginScreen);
If I console.log(dispatch), it will show dispatch is not defined.
import { LOGIN } from './types';
export const login = () => {
console.log('login action start')
return (dispatch) => {
console.log('dispatch start');
// console.log(dispatch);
dispatch({ type: LOGIN, testValue: 'I am test' });
};
};
src/reducers/LoginReducer.js
import { LOGIN } from '../actions/types';
const INITIAL_STATE = {
testValue: ''
};
export default (state = INITIAL_STATE, action) => {
console.log('reducer =>', action); // I can't see the console.log
switch (action.type) {
case LOGIN:
return {
...state,
testValue: action.testValue
};
default:
return state;
}
};
I have no idea why my action dispatch is not working. Do I set something wrong ?
Any help would be appreciated.
According to Zaki Obeid help, I update like this:
the action code:
export const login = () => {
console.log('login !');
return { type: LOGIN };
};
the function component code:
import { login } from '../../actions';
export const SettingScreen = ({ navigation, login }) => {
// return view code
}
const mapDispatchToProps = dispatch => ({
// you will use this to pass it to the props of your component
login: () => dispatch(login),
});
connect(null, mapDispatchToProps)(SettingScreen);

Answer 1

In LoginScreen component
you will need to add mapDispatchToProps
const mapDispatchToProps = dispatch => ({
// you will use this to pass it to the props of your component
login: () => dispatch(login()),
});
export default connect(mapStateToProps, mapDispatchToProps)(LoginScreen);
Then
you will need to destructure from the props as:
const LoginScreen = ({ navigation, login }) => {
// your code
}
In actions.js
the way you use dispatch here requires a library redux-thunk and it's used for async calls.
and the normal action should do the job for you:
export const login = () => ({
type: LOGIN,
testValue: 'I am test'
})
I hope this is useful and will solve your problem,
Have a good day.

Answer 2

In a react-redux app, you obtain the dispatch function either from getting a hold of the store object directly (store.dispatch), or via the react-redux connect function, which will provide dispatch as an argument to a function you write and then later hook up to a component
import { connect } from 'react-redux';
const mapStateToProps = ...
const mapDispatchToProps = (dispatch) => {
return {
someHandle: () => dispatch(myActionCreator())
}
}
export const connect(mapStateToProps, mapDispatchToProps)(MyComponent)
You can't just call dispatch out of thin air -- it's not a global function.

Answer 3

It seems you are using the login function directly. you will have to use the props. Just change the name for confusing and use through props.
import { combineReducers } from 'redux';
import LoginReducer from './LoginReducer';
export default combineReducers({
LoginRedux: LoginReducer
});
If I use my action login(), I can see login action start, but I can't see dispatch start
import React from 'react';
import {
Text,
View,
TouchableOpacity,
} from 'react-native';
import { connect } from 'react-redux';
import { login } from '../actions';
const LoginScreen = ({ navigation, userLogin }) => {
// console.log('see my test value', testValue)
return (
<View>
<TouchableOpacity
onPress={() => {
userLogin();
}
}>
<View>
<Text>LOGIN</Text>
</View>
</TouchableOpacity>
</View>
</View>
);
}
const mapStateToProps = (state) => {
const { testValue } = state.LoginRedux;
console.log('mapStateToProps testValue =>', testValue);
return { testValue };
};
export default connect(mapStateToProps, { userLogin:login })(LoginScreen);