Reactjs 如何在REACT和FLUX中创建API调用
我是一个新的反应和流量,我有一个艰难的时间试图找出如何从服务器加载数据。我能够从本地文件加载相同的数据,没有任何问题 首先,我有一个控制器视图(controller view.js),它将初始状态传递给一个视图(view.js) 控制器视图.jsReactjs 如何在REACT和FLUX中创建API调用,reactjs,reactjs-flux,Reactjs,Reactjs Flux,我是一个新的反应和流量,我有一个艰难的时间试图找出如何从服务器加载数据。我能够从本地文件加载相同的数据,没有任何问题 首先,我有一个控制器视图(controller view.js),它将初始状态传递给一个视图(view.js) 控制器视图.js var viewBill = React.createClass({ getInitialState: function(){ return { bill: BillStore.getAllBill() }; }, re
var viewBill = React.createClass({
getInitialState: function(){
return {
bill: BillStore.getAllBill()
};
},
render: function(){
return (
<div>
<SubscriptionDetails subscription={this.state.bill.statement} />
</div>
);
}
});
module.exports = viewBill;
var subscriptionsList = React.createClass({
propTypes: {
subscription: React.PropTypes.array.isRequired
},
render: function(){
return (
<div >
<h1>Statement</h1>
From: {this.props.subscription.period.from} - To {this.props.subscription.period.to} <br />
Due: {this.props.subscription.due}<br />
Issued:{this.props.subscription.generated}
</div>
);
}
});
module.exports = subscriptionsList;
var InitialiseActions = {
initApp: function(){
Dispatcher.dispatch({
actionType: ActionTypes.INITIALISE,
initialData: {
bill: BillApi.getBillLocal() // I switch to getBillServer for date from server
}
});
}
};
module.exports = InitialiseActions;
var BillApi = {
getBillLocal: function() {
return billed;
},
getBillServer: function() {
return $.getJSON('https://theurl.com/stuff.json').then(function(data) {
return data;
});
}
};
module.exports = BillApi;
var _bill = [];
var BillStore = assign({}, EventEmitter.prototype, {
addChangeListener: function(callback) {
this.on(CHANGE_EVENT, callback);
},
removeChangeListener: function(callback) {
this.removeListener(CHANGE_EVENT, callback);
},
emitChange: function() {
this.emit(CHANGE_EVENT);
},
getAllBill: function() {
return _bill;
}
});
Dispatcher.register(function(action){
switch(action.actionType){
case ActionTypes.INITIALISE:
_bill = action.initialData.bill;
BillStore.emitChange();
break;
default:
// do nothing
}
});
module.exports = BillStore;
然后我的数据API看起来像这样
// InitialActions.js
var InitialiseActions = {
initApp: function(){
BillApi.getBill(function(result){
// result from getJson is available here
Dispatcher.dispatch({
actionType: ActionTypes.INITIALISE,
initialData: {
bill: result
}
});
});
}
};
module.exports = InitialiseActions;
//api.js
var BillApi = {
getBillLocal: function() {
console.log(biller);
return biller;
},
getBill: function(callback) {
$.getJSON('https://theurl.com/stuff.json', callback);
}
};
api.js
var viewBill = React.createClass({
getInitialState: function(){
return {
bill: BillStore.getAllBill()
};
},
render: function(){
return (
<div>
<SubscriptionDetails subscription={this.state.bill.statement} />
</div>
);
}
});
module.exports = viewBill;
var subscriptionsList = React.createClass({
propTypes: {
subscription: React.PropTypes.array.isRequired
},
render: function(){
return (
<div >
<h1>Statement</h1>
From: {this.props.subscription.period.from} - To {this.props.subscription.period.to} <br />
Due: {this.props.subscription.due}<br />
Issued:{this.props.subscription.generated}
</div>
);
}
});
module.exports = subscriptionsList;
var InitialiseActions = {
initApp: function(){
Dispatcher.dispatch({
actionType: ActionTypes.INITIALISE,
initialData: {
bill: BillApi.getBillLocal() // I switch to getBillServer for date from server
}
});
}
};
module.exports = InitialiseActions;
var BillApi = {
getBillLocal: function() {
return billed;
},
getBillServer: function() {
return $.getJSON('https://theurl.com/stuff.json').then(function(data) {
return data;
});
}
};
module.exports = BillApi;
var _bill = [];
var BillStore = assign({}, EventEmitter.prototype, {
addChangeListener: function(callback) {
this.on(CHANGE_EVENT, callback);
},
removeChangeListener: function(callback) {
this.removeListener(CHANGE_EVENT, callback);
},
emitChange: function() {
this.emit(CHANGE_EVENT);
},
getAllBill: function() {
return _bill;
}
});
Dispatcher.register(function(action){
switch(action.actionType){
case ActionTypes.INITIALISE:
_bill = action.initialData.bill;
BillStore.emitChange();
break;
default:
// do nothing
}
});
module.exports = BillStore;
这就是商店
store.js
var viewBill = React.createClass({
getInitialState: function(){
return {
bill: BillStore.getAllBill()
};
},
render: function(){
return (
<div>
<SubscriptionDetails subscription={this.state.bill.statement} />
</div>
);
}
});
module.exports = viewBill;
var subscriptionsList = React.createClass({
propTypes: {
subscription: React.PropTypes.array.isRequired
},
render: function(){
return (
<div >
<h1>Statement</h1>
From: {this.props.subscription.period.from} - To {this.props.subscription.period.to} <br />
Due: {this.props.subscription.due}<br />
Issued:{this.props.subscription.generated}
</div>
);
}
});
module.exports = subscriptionsList;
var InitialiseActions = {
initApp: function(){
Dispatcher.dispatch({
actionType: ActionTypes.INITIALISE,
initialData: {
bill: BillApi.getBillLocal() // I switch to getBillServer for date from server
}
});
}
};
module.exports = InitialiseActions;
var BillApi = {
getBillLocal: function() {
return billed;
},
getBillServer: function() {
return $.getJSON('https://theurl.com/stuff.json').then(function(data) {
return data;
});
}
};
module.exports = BillApi;
var _bill = [];
var BillStore = assign({}, EventEmitter.prototype, {
addChangeListener: function(callback) {
this.on(CHANGE_EVENT, callback);
},
removeChangeListener: function(callback) {
this.removeListener(CHANGE_EVENT, callback);
},
emitChange: function() {
this.emit(CHANGE_EVENT);
},
getAllBill: function() {
return _bill;
}
});
Dispatcher.register(function(action){
switch(action.actionType){
case ActionTypes.INITIALISE:
_bill = action.initialData.bill;
BillStore.emitChange();
break;
default:
// do nothing
}
});
module.exports = BillStore;
如前所述,当我在actions中使用BillApi.getBillLocal()本地加载数据时,一切正常。但是当我更改为BillApi.getBillServer()时,控制台中会出现以下错误
Warning: Failed propType: Required prop `subscription` was not specified in `subscriptionsList`. Check the render method of `viewBill`.
Uncaught TypeError: Cannot read property 'period' of undefined
我还向BillApi.getBillServer()添加了一个console.log(数据),可以看到数据是从服务器返回的。但它在控制台中收到警告后显示,我认为这可能是问题所在。有人能给我一些建议或帮我解决吗?抱歉发这么长的帖子
更新
我对api.js文件做了一些更改(检查这里的更改和DOM错误plnkr.co/edit/HoXszori3HUAwUOHzPLG),因为有人认为问题在于我如何处理承诺。但这似乎仍然是在DOM错误中看到的相同问题。这是一个异步问题。使用
$.getJSON().then()
是不够的。由于它返回一个promise对象,因此必须在调用时通过执行类似于api.getBill()的操作来处理promise代码>
我用下面的代码做了一个测试:
function searchSpotify(query) {
return $.getJSON('http://ws.spotify.com/search/1/track.json?q=' + query)
.then(function(data) {
return data.tracks;
});
}
searchSpotify('donald trump')
.then(function(tracks) {
tracks.forEach(function(track) {
console.log(track.name);
});
});
另一种方法是在处理数据之前检查订阅的道具是否存在
尝试修改代码,使其看起来有点像这样:
render: function(){
var subscriptionPeriod = '';
var subscriptionDue = ['',''];
var subscriptionGenerated = '';
if(this.props.subscription !== undefined){
subscriptionPeriod = this.props.subscription.period;
subscriptionDue = [this.props.subscription.due.to,this.props.subscription.due.from];
subscriptionGenerated = this.props.subscription.generated;
}
return (
<div >
<h1>Statement</h1>
From: {subscriptionPeriod[0]} - To {subscriptionPeriod[1]} <br />
Due: {subscriptionDue}<br />
Issued:{subscriptionGenerated}
</div>
);
}
import keyMirror from 'keymirror';
import ApiService from '../../lib/api';
import Dispatcher from '../dispatcher/dispatcher';
import config from '../env/config';
export let ActionTypes = keyMirror({
GetAllBillPending: null,
GetAllBillSuccess: null,
GetAllBillError: null
}, 'Bill:');
export default {
fetchBills () {
Dispatcher.dispatch(ActionTypes.GetAllBillPending);
YOUR_API_CALL
.then(response => {
//fetchs your API/service call to fetch all Bills
Dispatcher.dispatch(ActionTypes.GetAllBillSuccess, response);
})
.catch(err => {
//catches error if you want to
Dispatcher.dispatch(ActionTypes.GetAllBillError, err);
});
}
};
render:function(){
var subscriptionPeriod='';
var subscriptionDue=['',];
var subscriptionGenerated='';
if(this.props.subscription!==未定义){
subscriptionPeriod=this.props.subscription.period;
subscriptionDue=[this.props.subscription.due.to,this.props.subscription.due.from];
subscriptionGenerated=this.props.subscription.generated;
}
返回(
陈述
从:{subscriptionPeriod[0]}-到{subscriptionPeriod[1]}
到期:{subscriptionDue}
已发布:{subscriptionGenerated}
);
}
在返回之前的渲染函数中,尝试添加以下内容:
if(this.props.subscription!=未定义){
//在这里做点什么
}
由于您的数据更改顶级组件的状态,它将在定义订阅道具的数据后重新触发渲染 如果我理解正确,你可以试试这样的东西
// InitialActions.js
var InitialiseActions = {
initApp: function(){
BillApi.getBill(function(result){
// result from getJson is available here
Dispatcher.dispatch({
actionType: ActionTypes.INITIALISE,
initialData: {
bill: result
}
});
});
}
};
module.exports = InitialiseActions;
//api.js
var BillApi = {
getBillLocal: function() {
console.log(biller);
return biller;
},
getBill: function(callback) {
$.getJSON('https://theurl.com/stuff.json', callback);
}
};
$.getJSON不会从http请求返回值。它使回调函数可以使用它。
此处详细解释了其背后的逻辑:从代码中可以看出,预期的流类似于:
- 某些组件触发初始化操作
- 初始化操作调用API
- 等待来自服务器的结果(我认为这里是问题的症结所在:您的组件渲染在来自服务器的结果返回之前开始)
- 然后将结果传递给商店
- 它发出变化和
- 触发重新渲染
在典型的通量设置中,我建议将其结构有所不同:
- 某些组件调用API(,但尚未向dispatcher发出操作))
- API执行
getJSON
,并等待服务器结果
- 只有在收到结果后,API才会使用收到的数据触发初始化操作
- 存储响应操作,并使用结果更新自身
- 然后释放变化
- 哪个触发了重新渲染
我不太熟悉jquery、承诺和链接,但我认为这将大致转化为代码中的以下更改:
- 控制器视图需要将更改侦听器添加到存储:添加一个
componentDidMount()
函数,该函数将事件侦听器添加到flux存储更改李>
- 在控制器视图中,事件侦听器触发一个
setState()
函数,该函数从存储中获取最新的账单
- 将
dispatcher.dispatch()
从您的actions.js移动到您的api.js(替换返回数据
)李>
这样,您的组件最初应该呈现一些“加载”消息,并在服务器中的数据进入后立即更新。我将分离我的操作、存储和视图(React组件)
首先,我要这样实施我的行动:
render: function(){
var subscriptionPeriod = '';
var subscriptionDue = ['',''];
var subscriptionGenerated = '';
if(this.props.subscription !== undefined){
subscriptionPeriod = this.props.subscription.period;
subscriptionDue = [this.props.subscription.due.to,this.props.subscription.due.from];
subscriptionGenerated = this.props.subscription.generated;
}
return (
<div >
<h1>Statement</h1>
From: {subscriptionPeriod[0]} - To {subscriptionPeriod[1]} <br />
Due: {subscriptionDue}<br />
Issued:{subscriptionGenerated}
</div>
);
}
import keyMirror from 'keymirror';
import ApiService from '../../lib/api';
import Dispatcher from '../dispatcher/dispatcher';
import config from '../env/config';
export let ActionTypes = keyMirror({
GetAllBillPending: null,
GetAllBillSuccess: null,
GetAllBillError: null
}, 'Bill:');
export default {
fetchBills () {
Dispatcher.dispatch(ActionTypes.GetAllBillPending);
YOUR_API_CALL
.then(response => {
//fetchs your API/service call to fetch all Bills
Dispatcher.dispatch(ActionTypes.GetAllBillSuccess, response);
})
.catch(err => {
//catches error if you want to
Dispatcher.dispatch(ActionTypes.GetAllBillError, err);
});
}
};
下一个是我的存储,因此我可以跟踪api调用期间突然发生的所有更改:
class BillStore extends YourCustomStore {
constructor() {
super();
this.bindActions(
ActionTypes.GetAllBillPending, this.onGetAllBillPending,
ActionTypes.GetAllBillSuccess, this.onGetAllBillSuccess,
ActionTypes.GetAllBillError , this.onGetAllBillError
);
}
getInitialState () {
return {
bills : []
status: Status.Pending
};
}
onGetAllBillPending () {
this.setState({
bills : []
status: Status.Pending
});
}
onGetAllBillSuccess (payload) {
this.setState({
bills : payload
status: Status.Ok
});
}
onGetAllBillError (error) {
this.setState({
bills : [],
status: Status.Errors
});
}
}
export default new BillStore();
最后,您的组件:
import React from 'react';
import BillStore from '../stores/bill';
import BillActions from '../actions/bill';
export default React.createClass({
statics: {
storeListeners: {
'onBillStoreChange': BillStore
},
},
getInitialState () {
return BillStore.getInitialState();
},
onBillStoreChange () {
const state = BillStore.getState();
this.setState({
bills : state.bills,
pending: state.status === Status.Pending
});
},
componentDidMount () {
BillActions.fetchBills();
},
render () {
if (this.state.pending) {
return (
<div>
{/* your loader, or pending structure */}
</div>
);
}
return (
<div>
{/* your Bills */}
</div>
);
}
});
从“React”导入React;
从“../stores/bill”导入BillStore;
从“../actions/bill”导入BillActions;
导出默认的React.createClass({
静力学:{
storeListeners:{
“onBillStoreChange”:BillStore
},
},
getInitialState(){
返回BillStore.getInitialState();
},
onBillStoreChange(){
const state=BillStore.getState();
这是我的国家({
法案:州法案,
挂起:state.status==status.pending
});
},
组件安装(){
bellActions.fetchBills();
},
渲染(){
if(this.state.pending){
返回(
{/*加载程序或挂起结构*/}
);
}
返回(
{/*您的账单*/}
);
}
});
假设您实际上是从API获取数据,但是获取数据太晚,并且首先抛出错误,请尝试以下操作:
在controller-view.js中,添加以下内容:
componentWillMount: function () {
BillStore.addChangeListener(this._handleChangedBills);
},
componentWillUnmount: function () {
BillStore.removeChangeListener(this._handleChangedBills);
},
_handleChangedBills = () => {
this.setState({bill: BillStore.getAllBill()});
}
在getInitialState函数中,提供一个空对象,该对象具有代码所期望的结构(具体来说,在其中包含一个“statement”对象)。大概是这样的:
getInitialState: function(){
return {
bill: { statement: [] }
};
},
Wh