React Redux-从Firebase获取数据

我试图使用Firebase捕捉一些数据并显示在我的web应用程序上，但我不知道如何做到这一点。我用的是reduxThunk。 我收到的错误未定义id。 这是我的组件

trabalhos.js

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


class Trabalhos extends Component {

    componentWillMount(){
        this.props.fetchData();
    }

    renderList({id,tec,title}){
        return(
            <li className="list-group-item" key={id}>
                <p>{title}</p>
                <p>{tec}</p>
            </li>
        )
    }

    render(){
    return (

        <div>
            <div className="trabalhos">
                <div className="trabalhos_caixa">
                    <div className="row">
                        <div className="col-xs-12">
                            <ul className="no_pad">
                                {this.renderList()}
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    );
}

}


function mapStateToProps(state){

return { fetch: state.fetch };
}


export default connect(mapStateToProps, actions)(Trabalhos);

import Firebase from 'firebase';
import { FETCH_DATA } from './types';

const Data = new Firebase('https://portofoliofirebase.firebaseio.com');

export function fetchData(){
return dispatch => {
    Data.on('value', snapshot => {
        dispatch({
            type: FETCH_DATA,
            payload: snapshot.val()
        });
    });
}

}

import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import { Router, browserHistory } from 'react-router';
import reducers from './reducers';
import routes from './routes';
import * as **firebase** from 'firebase';
import **reduxThunk** from 'redux-thunk'

const createStoreWithMiddleware = applyMiddleware(reduxThunk)(createStore);
const store = createStoreWithMiddleware(reducers);


ReactDOM.render(
<Provider store={store}>
<Router history={browserHistory} routes={routes} />
</Provider>
, document.querySelector('.container'));

import { FETCH_DATA } from '../actions/types';

export default function(state = [], action) {
switch(action.type){
    case FETCH_DATA:
        return action.payload.data;     
}

return state;
}

import { combineReducers } from 'redux';
import fetchReducer from './fetch_reducer';

const rootReducer = combineReducers({

fetch: fetchReducer

});

export default rootReducer;

这是我的索引.js

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


class Trabalhos extends Component {

    componentWillMount(){
        this.props.fetchData();
    }

    renderList({id,tec,title}){
        return(
            <li className="list-group-item" key={id}>
                <p>{title}</p>
                <p>{tec}</p>
            </li>
        )
    }

    render(){
    return (

        <div>
            <div className="trabalhos">
                <div className="trabalhos_caixa">
                    <div className="row">
                        <div className="col-xs-12">
                            <ul className="no_pad">
                                {this.renderList()}
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    );
}

}


function mapStateToProps(state){

return { fetch: state.fetch };
}


export default connect(mapStateToProps, actions)(Trabalhos);

import Firebase from 'firebase';
import { FETCH_DATA } from './types';

const Data = new Firebase('https://portofoliofirebase.firebaseio.com');

export function fetchData(){
return dispatch => {
    Data.on('value', snapshot => {
        dispatch({
            type: FETCH_DATA,
            payload: snapshot.val()
        });
    });
}

}

import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import { Router, browserHistory } from 'react-router';
import reducers from './reducers';
import routes from './routes';
import * as **firebase** from 'firebase';
import **reduxThunk** from 'redux-thunk'

const createStoreWithMiddleware = applyMiddleware(reduxThunk)(createStore);
const store = createStoreWithMiddleware(reducers);


ReactDOM.render(
<Provider store={store}>
<Router history={browserHistory} routes={routes} />
</Provider>
, document.querySelector('.container'));

import { FETCH_DATA } from '../actions/types';

export default function(state = [], action) {
switch(action.type){
    case FETCH_DATA:
        return action.payload.data;     
}

return state;
}

import { combineReducers } from 'redux';
import fetchReducer from './fetch_reducer';

const rootReducer = combineReducers({

fetch: fetchReducer

});

export default rootReducer;

这是我的Reducerindex.js

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


class Trabalhos extends Component {

    componentWillMount(){
        this.props.fetchData();
    }

    renderList({id,tec,title}){
        return(
            <li className="list-group-item" key={id}>
                <p>{title}</p>
                <p>{tec}</p>
            </li>
        )
    }

    render(){
    return (

        <div>
            <div className="trabalhos">
                <div className="trabalhos_caixa">
                    <div className="row">
                        <div className="col-xs-12">
                            <ul className="no_pad">
                                {this.renderList()}
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    );
}

}


function mapStateToProps(state){

return { fetch: state.fetch };
}


export default connect(mapStateToProps, actions)(Trabalhos);

import Firebase from 'firebase';
import { FETCH_DATA } from './types';

const Data = new Firebase('https://portofoliofirebase.firebaseio.com');

export function fetchData(){
return dispatch => {
    Data.on('value', snapshot => {
        dispatch({
            type: FETCH_DATA,
            payload: snapshot.val()
        });
    });
}

}

import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import { Router, browserHistory } from 'react-router';
import reducers from './reducers';
import routes from './routes';
import * as **firebase** from 'firebase';
import **reduxThunk** from 'redux-thunk'

const createStoreWithMiddleware = applyMiddleware(reduxThunk)(createStore);
const store = createStoreWithMiddleware(reducers);


ReactDOM.render(
<Provider store={store}>
<Router history={browserHistory} routes={routes} />
</Provider>
, document.querySelector('.container'));

import { FETCH_DATA } from '../actions/types';

export default function(state = [], action) {
switch(action.type){
    case FETCH_DATA:
        return action.payload.data;     
}

return state;
}

import { combineReducers } from 'redux';
import fetchReducer from './fetch_reducer';

const rootReducer = combineReducers({

fetch: fetchReducer

});

export default rootReducer;

---

您正在调用

this.renderList（）

，而没有任何参数，因此

id

在

确实没有定义

。我想你可能想使用
this.props.payload.data.map（this.renderList）
？
你调用的
this.renderList（）
没有任何参数，所以
id
在
实际上
没有定义。我猜您可能想使用
this.props.payload.data.map（this.renderList）
？
Trabalhos组件的道具设置在哪里？你想让它成为一个连接的组件吗？我已经更新了@希莱罗这个错误是从哪里来的？你的firebase应用程序工作正常吗？从文档中可以看出，在Firebase激活之前，您必须运行initializeApp。此外，您必须在
firebase.database（）.ref（）
上调用
.on（）
，以侦听更改。我认为您不能直接在firebase实例上调用
.on（）
（下面的链接）@Shane感谢您的帮助，当我运行initializeApp时，我得到了一个错误：Uncaught TypeError:firebase.initializeApp不是一个函数（…），Trabalhos组件在哪里设置道具？你想让它成为一个连接的组件吗？我已经更新了@希莱罗这个错误是从哪里来的？你的firebase应用程序工作正常吗？从文档中可以看出，在Firebase激活之前，您必须运行initializeApp。此外，您必须在
firebase.database（）.ref（）
上调用
.on（）
，以侦听更改。我认为您不能直接在firebase实例上调用
.on（）
（下面的链接）@Shane感谢您的帮助，当我运行initializeApp时，我得到了一个错误：Uncaught TypeError:firebase.initializeApp不是一个函数（…）
this.props.payload.data.map（this.renderList）
是关于您正在尝试做什么的预感。您应该用正确的道具名称替换。谢谢leo，但它不起作用，我尝试使用uLodash
this.props.payload.data.map（this.renderList）
是关于您尝试做什么的预感。你应该用正确的道具名称来替换。谢谢利奥，但它不起作用，我正在尝试使用