反应本机连接功能不通过prop将动作传递给子组件

Question

I am just getting familiarized with redux and have been reading that I am supposed to pass in action creators through the parent of the app, and through mapStateToProps, mapDispatchToProps, and the connect function I should be able to pass actions. However, when I call in the child component this.props. the function is nonexistent, so it seems that it is not being passed properly.

I would greatly appreciate assistance.

Note: I left out some things like imports and the reducer to be more concise.

login.js:

export function login(token, id) {
  console.log('login action');
  return {
    type: 'LOG_IN',
    token,
    id,
  };
}

index.ios.js:

import * as actionCreators from './actions/login'

const store = createStore(RootReducer, undefined, autoRehydrate());
persistStore(store);

class App extends Component {
  constructor(props) {
    super(props);
    state = {
      token: '',
      id: '',
      store: store,
    };
  }

  render() {    
    return (

    <Provider store={ state.store }>
      <View style = {styles.container}>
        <LoginView/>
      </View>
    </Provider>
    );
  }
}

AppRegistry.registerComponent('App', () => App); 

function mapStateToProps(state) {
  return {
    token: state.token,
    id: state.id
  }
}

function mapDispatchToProps(dispatch) {
  return bindActionCreators({actionCreators}, dispatch);
}

export default connect(mapStateToProps, mapDispatchToProps)(App);

loginView.js:

export class LoginView extends View {

  static propTypes = {}

  static defaultProps = {}

  constructor(props) {
    console.log(props);
    super(props)
    this.state = {
      user: '',
      token: '',
      id: '',
    }
    this.onLogin = this.onLogin.bind(this);
  }

  onLogin() {
    console.log("on login1");
    this.props.login({token: this.state.token, id: this.state.id});
    console.log("on login");
  }

And basically what happens is that when the onLogin() function is evoked directly above, it states that this.props.login is not a function. What is the reasoning for this and how can I fix it?

Answer 1

You're connecting the App component, so that will have this.props.onLogin() . However, you're not passing onLogin as a prop to <LoginView /> . You need to either render <LoginView onLogin={this.props.onLogin} /> , or connect LoginView also and include onLogin as part of that component's connection.

Answer 2

This line:

return bindActionCreators({actionCreators}, dispatch);

should be:

return bindActionCreators(actionCreators, dispatch);

"actionCreators" is already an object. By passing it inside another set of curly braces, it is being interpreted as the syntax for ES6 shorthand property names. What you are actually passing is a new object that look like this:

{
  actionCreators: {
    login: ... // your action is buried here
  }
}

// ^^ which would get mapped to this.props.actionsCreators.login (wrong)

Answer 3

seems redux connect in react native to bind state in components thase days is using

import {connect} from "react-redux";
...
class HomeScreen extends React.Component { 
// do your things.. 
constructor(props) {
  super(props);
  console.log(this.props);
  }
  render () {
....
  }
}

const mapStateToProps = state => {
 return { user: state.user };
 };
 export default connect(mapStateToProps)(HomeScreen);