Question

我的组件没有渲染，我没有收到任何错误。我一直坚持这个错误几个小时，所以我正在寻找任何建议！

我正在尝试使用 componentWillMount（）加载页面时显示数据，当前没有显示任何内容。在我能够使用组件呈现简单字符串之前。现在我没有从组件获取任何控制台日志，而不是文本，没有...我的api工作但我没有在Chrome控制台获得http调用。以下是我的文件。

indexTimesheet.js（component）

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);

index.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（行动档案）

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
  };
}

timesheet 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

我能够在我的样板模板中重新创建您的项目，并且还能够重新创建您的问题。

在index.js中：

// components

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

应该是这个 - 组件周围没有括号：

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

这是一个有趣的问题，因为正如你所说，它不会引发错误...... 当你用redux存储和react-router 包装它时。

如果您只是这样做：

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

这将引发错误：

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Redux / React-Router吞下了这个错误，我还没有挖到哪里。在将来的故障排除中，始终会尝试简化您的问让所有东西尽可能简单，然后构建它直到你得到错误 - 我脱掉你的redux商店和反应路由器包装，这是我能够发现它。

尝试一下，看看确保它不仅仅是我的版本。

React / Redux组件不会呈现

1 个答案: