Question

我正在使用react，redux，axios和redux-thunk来处理异步。

我有一种感觉，解决方案将是显而易见的但由于某种原因，我无法映射一组用户（从本地express / node api检索）并渲染每个用户。用户的信息将登录到控制台，但是......

<p>NO USERS FOUND</p>

...组件将呈现在屏幕上。

这是我的回购：https://github.com/tedjames/reduxTest

这就是我的组件的样子：

import React, { Component } from 'react';
import { connect } from 'react-redux'
import { getUsers } from '../redux/actions'

class App extends Component {
  componentWillMount() {
    console.log(this.props);
    this.props.getUsers();
  }

  render() {
    if (this.props.users[1]) {
      this.props.users.map((user) => {
        console.log("USER FOUND!");
        console.log(user.email);
        return <p key={user.id}>USER FOUND: {user.email}</p>
      });
    } else {
      return <p>NO USERS FOUND</p>
    }
  }
}

const mapStateToProps = state => {
  return {
    users: state.admin.users
  };
};

export default connect(mapStateToProps, { getUsers })(App);

这是我使用axios获取用户的行为：

import axios from 'axios'
import { GET_USERS } from './types'

export const getUsers = () => {
  return (dispatch) => {
    axios.get('http://localhost:3090/users')
      .then(res => {
        console.log("<-- // DATA RECEIVED FROM SERVER // --> ");
        console.log(res);
        dispatch({ type: GET_USERS, payload: res.data })
      })
      .catch(({ response }) => {
        console.log("// ERROR RECEIVED FROM SERVER //");
        console.log(response);
      });
  }
};

This is what my console outputs

Answer 1

你必须在render内返回数组（并将其包装在某个标签中）：

return (
  <div>{ this.props.users.map((user) => {
      console.log("USER FOUND!");
      console.log(user.email);
      return <p key={user.id}>USER FOUND: {user.email}</p> }
  </div> 
 );

React组件无法从API映射和呈现数组中的数据

1 个答案: