我正在尝试遍历数据并将其显示在我的 React 应用程序中。在我将结果存储在组件状态之前,我的代码一直有效。不知何故(我将它标记为“这里它不再工作”,因为它很难解释。我重写了我的实际代码,因为我不想在这里发布数百行代码:)并且还交换了数据(我实际上收到了一个带有对象(我只调整了大小)的 http 请求 - 所以如果代码的某些部分看起来很奇怪/太多,请不要注意,因为我的实际代码要大得多。我还在此处添加了一个 codepen 链接,您在这里看不到任何内容(因为它不起作用),但我包含了 console.logs,因此您可以明白我的意思。非常感谢您的帮助!!
https://codepen.io/helloocoding/pen/vWVLmp?editors=1010
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
data: PricedItineraries,
result: []
}
this.handleInput = this.handleInput.bind(this);
this.showSearchResults = this.showSearchResults.bind(this);
}
showSearchResults(obj) {
console.log("func", this.state.data)
var allTrips = [];
var TotalPriceTemp = [];
for (var i = 0; i < obj.length; i++) {
var o = obj[i];
allTrips.push(o.AirItinerary.OriginDestinationOptions.OriginDestinationOption)
var totalFair = o.AirItineraryPricingInfo.PTC_FareBreakdowns.PTC_FareBreakdown.PassengerFare.TotalFare;
TotalPriceTemp.push(totalFair.Amount);
}
for (var i = 0; i < allTrips.length; i++) {
var MarketingAirlineTo = [];
var MarketingAirlineBack = [];
var TotalPrice = 0;
var oneWay = allTrips[i][0];
var returnTrip = allTrips[i][1];
oneWay.FlightSegment.forEach(function (flightTo) {
MarketingAirlineTo.push(flightTo.MarketingAirline.Code);
})
returnTrip.FlightSegment.forEach(function (flightTo) {
MarketingAirlineBack.push(flightTo.MarketingAirline.Code)
})
TotalPriceTemp.forEach(function (item) {
TotalPrice += item;
})
var tempFlightsObject = [];
tempFlightsObject.push({
marketingAirlineTo: MarketingAirlineTo,
marketingAirlineBack: MarketingAirlineBack,
TotalPrice: TotalPriceTemp[i]
})
console.log("tempFlightsObject", tempFlightsObject)
this.setState({
result: tempFlightsObject
})
console.log("result", this.state.result)
//HERE IT DOESNT WORK ANYMORE: TEMPFLIGHTOBJECT shows correct data, but result doesn't
}
}
handleInput() {
console.log("handeInput func", this.state.data)
this.showSearchResults(this.state.data);
console.log("handeInput func -result", this.state.result)
}
render() {
const flights = this.state.result.map((item, i) => {
return (
<div>
<div key={i}><p> {item.marketingAirlineTo} </p></div>
</div>
)
})
return (
<div>
<button onClick={this.handleInput}>click me</button>
<div> {flights}</div>
</div>
)
}
}
React.render(<App />, document.getElementById('app'));
最佳答案
setState
可以通过响应批量更新和优化性能异步执行。
您可以为 setState
提供回调,一旦更新实际完成,就会调用该回调:
this.setState({
result: tempFlightsObject
}, function () { console.log("result", this.state.result) })
关于javascript - React - 使用数据设置状态不起作用/将其设置为空数组 - 为什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47537109/