javascript - React/Redux 组件不会渲染

Question

我的组件没有渲染，我也没有收到任何错误。我已经被这个错误困住了几个小时，所以我正在寻找任何建议!

我正在尝试使用 componentWillMount() 获取要在页面加载时显示的数据，但当前没有显示任何内容。在我能够使用组件呈现简单的字符串之前。现在我没有从组件中获取任何控制台日志，不是文本，什么都没有...我的 api 有效但我没有在 chrome 控制台中获取 http 调用。以下是我的文件。

indexTimesheet.js(组件)

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

class IndexTimesheet extends Component {
  componentWillMount() {
    console.log("test");
    this.props.getTimesheet();
  }

  render() {
    return (
      <h3>Index Timesheet</h3>
    );
  }
}

IndexTimesheet.propTypes = {
  getTimesheet: PropTypes.func
};

export default connect(null, {getTimesheet})(IndexTimesheet);

索引.js

import React from 'react';
import ReactDOM from 'react-dom';
import {Provider} from 'react-redux';
import {createStore, applyMiddleware} from 'redux';
import {Router, Route, browserHistory} from 'react-router'; // , IndexRoute
import promise from 'redux-promise';
import reducers from './app/reducers';

const createStoreWithMiddleware = applyMiddleware(promise)(createStore);

// components
import {IndexTimesheet} from './app/components/indexTimesheet';

ReactDOM.render(
 <Provider store={createStoreWithMiddleware(reducers)}>
   <Router history={browserHistory}>
     <Route path="/" component={IndexTimesheet}/>
   </Router>
 </Provider>,
document.getElementById('root')
);

getTime.js( Action 文件)

import axios from 'axios';
export const GET_TIME = 'GET_TIME';
export const ROOT_URL = 'http://127.0.0.1:3055/api/v1/timesheet/';


export function getTimesheet() {
  const request = axios.get(ROOT_URL);

  return {
    type: GET_TIME,
    payload: request
  };
}

时间表 reducer.js

import {GET_TIME} from '../actions/getTime';
const INITIAL_STATE = {all: [], user: []};

export default function (state = INITIAL_STATE, action) {
  switch (action.type) {
    case GET_TIME:
  return {state, all: action.payload.data};
    default:
  return state;
  }
}

索引缩减器

import {combineReducers} from 'redux';
import TimesheetReducer from './timesheet';

const rootReducer = combineReducers({
  time: TimesheetReducer
});

export default rootReducer;

Answer 1

我能够在我拥有的样板模板中重新创建您的项目，也能够重新创建您的问题。

在你的 index.js 中:

//组件

import {IndexTimesheet} from './app/components/indexTimesheet';

应该是这样的——组件周围没有括号:

import IndexTimesheet from './app/components/indexTimesheet';

这是一个有趣的问题，因为正如您所说，它不会抛出任何错误...当您用 redux 存储和 react-router 包装它时。

如果你只是简单地做:

ReactDOM.render(<IndexTimesheet />, document.getElementById('root'));

这将抛出一个错误:

warning.js:45 Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components).warning @ warning.js:45ReactElementValidator.createElement @ ReactElementValidator.js:221(anonymous function) @ index.js:37(anonymous function) @ index.js:39(anonymous function) @ index.js:40(anonymous function) @ bundle.js:1036__webpack_require__ @ bundle.js:556fn @ bundle.js:87(anonymous function) @ multi_main:3(anonymous function) @ bundle.js:586__webpack_require__ @ bundle.js:556(anonymous function) @ bundle.js:579(anonymous function) @ bundle.js:582
invariant.js:39 Uncaught Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined.

所以某个错误被 Redux/React-Router 吞没了，我还没有深入到哪里。在以后的故障排除中，请始终尝试简化您的问题。尽可能让所有东西都尽可能简单，然后构建它，直到出现错误 - 我取消了你的 redux store 和 react-router 包装，这就是我能够发现它的方式。

试试看，确保它不只是在我的构建上。