[英]App.jsx:43 Uncaught (in promise) TypeError: this.state.concerts.map is not a function(…)
當我試圖從我的App.jsx中的ticketmaster api渲染json時，我一直收到此錯誤。 我在后端的網址是提取數據以顯示前10場音樂會結果。 它在chrome中的反應控制台中顯示完全正常，當我嘗試將結果映射到div時，我收到此錯誤消息。 請幫我。
import React, { Component } from 'react';
class App extends Component {
constructor() {
super();
this.state = {
concerts: [],
}
this.handleZip = this.handleZip.bind(this);
}
handleZip(e) {
e.preventDefault();
let zip = e.target.value;
if (zip) {
fetch(`api/services/ticketmaster/shows/${zip}`)
.then((response) => {
response.json().then(concerts => this.setState({
concerts: concerts._embedded,
// name: Object.values(concerts._embedded.events[0].images[0]),
// image: concerts._embedded.events[0].images[0],
// url: concerts._embedded.events[0].url,
// info: concerts._embedded.events[0].info,
// date: concerts._embedded.events[0].classifications[0].name,
}));
});
}
}
render() {
return (
<div className="search-container">
<div className="zipcode-search-bar">
<input onBlur={this.handleZip} type="text" placeholder="Enter your zip code" />
</div>
<div className="zipcode-search-btn">
<button className="zip-btn" onBlur= {this.handleZip}>Search</button>
</div>
<div>
{
this.state.concerts.map((concert) => {
return (
<div>
{concert}
</div>
);
})
}
</div>
</div>
);
}
}
export default App;
這就是售票員中售票員的數據：
{
"_embedded": {
"events": [
{
"name": "Big Gigantic",
"type": "event",
"id": "k7vGFfodZESLi",
"test": false,
"url": "http://ticketmaster.com/event/00005110C09F37EC",
"locale": "en-us",
"images": [
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025- b49a-5e20544c52e6_153341_EVENT_DETAIL_PAGE_16_9.jpg",
"width": 205,
"height": 115,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_TABLET_LANDSCAPE_LARGE_16_9.jpg",
"width": 2048,
"height": 1152,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RETINA_LANDSCAPE_16_9.jpg",
"width": 1136,
"height": 639,
"fallback": false
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_TABLET_LANDSCAPE_3_2.jpg",
"width": 1024,
"height": 683,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_TABLET_LANDSCAPE_16_9.jpg",
"width": 1024,
"height": 576,
"fallback": false
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RETINA_PORTRAIT_3_2.jpg",
"width": 640,
"height": 427,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RETINA_PORTRAIT_16_9.jpg",
"width": 640,
"height": 360,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RECOMENDATION_16_9.jpg",
"width": 100,
"height": 56,
"fallback": false
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_ARTIST_PAGE_3_2.jpg",
"width": 305,
"height": 203,
"fallback": false
},
{
"ratio": "4_3",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_CUSTOM.jpg",
"width": 305,
"height": 225,
"fallback": false
}
],
"sales": {
"public": {
"startDateTime": "2016-09-09T14:00:00Z",
"startTBD": false,
"endDateTime": "2016-11-06T00:00:00Z"
},
"presales": [
{
"startDateTime": "2016-09-07T14:00:00Z",
"endDateTime": "2016-09-09T02:00:00Z",
"name": "Venue Presale"
}
]
},
"dates": {
"start": {
"localDate": "2016-11-05",
"localTime": "21:00:00",
"dateTime": "2016-11-06T01:00:00Z",
"dateTBD": false,
"dateTBA": false,
"timeTBA": false,
"noSpecificTime": false
},
"timezone": "America/New_York",
"status": {
"code": "offsale"
}
},
"classifications": [
{
"primary": true,
"segment": {
"id": "KZFzniwnSyZfZ7v7nJ",
"name": "Music"
},
"genre": {
"id": "KnvZfZ7vAvF",
"name": "Dance/Electronic"
},
"subGenre": {
"id": "KZazBEonSMnZfZ7vAJ1",
"name": "Club Dance"
}
}
],
"promoter": {
"id": "653",
"name": "LIVE NATION MUSIC",
"description": "LIVE NATION MUSIC / NTL / USA"
},
"info": "Big Gigantic has always been dedicated to giving back to those in need through their #ABigGiganticDifference Initiative. On this Brighter Future tour, they will continue the #ABigGiganticDifference mission by donating a percentage of ticket sales from each show to a local nonprofit of charity in need in each city. In our city of Huntington, they will be supporting the mission to collect toys for children in need by donating to Toys of Hope. If you'd like more information on Toys of Hope or would like to look into further volunteer or donation options with them, please visit http://www.toysofhope.org/contact_us.html. Thank you for continuing to support their initiative and by purchasing a ticket to this show, you are truly making #ABigGiganticDifference in our city!",
"priceRanges": [
{
"type": "standard",
"currency": "USD",
"min": 25,
"max": 66
}
],
"_links": {
"self": {
"href": "/discovery/v2/events/k7vGFfodZESLi?locale=en-us"
},
"attractions": [
{
"href": "/discovery/v2/attractions/K8vZ917GRLf?locale=en-us"
},
{
"href": "/discovery/v2/attractions/K8vZ9173V70?locale=en-us"
}
],
"venues": [
{
"href": "/discovery/v2/venues/KovZpZAEAEtA?locale=en-us"
}
]
},
"_embedded": {
"venues": [
{
"name": "The Paramount",
"type": "venue",
"id": "KovZpZAEAEtA",
"test": false,
"url": "http://ticketmaster.com/venue/1280",
"locale": "en-us",
"postalCode": "11743",
"timezone": "America/New_York",
"city": {
"name": "Huntington"
},
"state": {
"name": "New York",
"stateCode": "NY"
},
"country": {
"name": "United States Of America",
"countryCode": "US"
},
"address": {
"line1": "370 New York Ave"
},
"location": {
"longitude": "-73.42591099",
"latitude": "40.86969685"
},
"markets": [
{
"id": "35"
},
{
"id": "124"
}
],
"dmas": [
{
"id": 296
},
{
"id": 345
}
],
"social": {
"twitter": {
"handle": "@TheParamountNY"
}
},
"boxOfficeInfo": {
"phoneNumberDetail": "For more information please visit paramountny.com VIP Seating and Packages: Please call 631-673-7300 or visit paramountny.com",
"acceptedPaymentDetail": "Cash, Visa, MasterCard, Discover, Diners Club, & American Express",
"willCallDetail": "Location : Main Lobby Opens : 1 hour prior to show or event"
},
"parkingDetail": "For parking information please visit : paramountny.com",
"accessibleSeatingDetail": "This is an accessible venue.",
"generalInfo": {
"generalRule": "NO cameras NO recording NO outside food or beverages (including alcohol) Backpacks and large bags must must be checked. ALL bags are subject to search. Smoking is NOT permitted",
"childRule": "Everyone needs a ticket to enter"
},
"_links": {
"self": {
"href": "/discovery/v2/venues/KovZpZAEAEtA?locale=en-us"
}
}
}
],
"attractions": [
{
"name": "Big Gigantic",
"type": "attraction",
"id": "K8vZ917GRLf",
"test": false,
"url": "http://ticketmaster.com/artist/1474639",
"locale": "en-us",
"images": [
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_EVENT_DETAIL_PAGE_16_9.jpg",
"width": 205,
"height": 115,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_TABLET_LANDSCAPE_LARGE_16_9.jpg",
"width": 2048,
"height": 1152,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RETINA_LANDSCAPE_16_9.jpg",
"width": 1136,
"height": 639,
"fallback": false
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_TABLET_LANDSCAPE_3_2.jpg",
"width": 1024,
"height": 683,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_TABLET_LANDSCAPE_16_9.jpg",
"width": 1024,
"height": 576,
"fallback": false
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RETINA_PORTRAIT_3_2.jpg",
"width": 640,
"height": 427,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RETINA_PORTRAIT_16_9.jpg",
"width": 640,
"height": 360,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_RECOMENDATION_16_9.jpg",
"width": 100,
"height": 56,
"fallback": false
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_ARTIST_PAGE_3_2.jpg",
"width": 305,
"height": 203,
"fallback": false
},
{
"ratio": "4_3",
"url": "http://s1.ticketm.net/dam/a/2e6/6c23d561-98d7-4025-b49a-5e20544c52e6_153341_CUSTOM.jpg",
"width": 305,
"height": 225,
"fallback": false
}
],
"classifications": [
{
"primary": true,
"segment": {
"id": "KZFzniwnSyZfZ7v7nJ",
"name": "Music"
},
"genre": {
"id": "KnvZfZ7vAvF",
"name": "Dance/Electronic"
},
"subGenre": {
"id": "KZazBEonSMnZfZ7vAJ1",
"name": "Club Dance"
}
}
],
"_links": {
"self": {
"href": "/discovery/v2/attractions/K8vZ917GRLf?locale=en-us"
}
}
},
{
"name": "Illenium",
"type": "attraction",
"id": "K8vZ9173V70",
"test": false,
"url": "http://ticketmaster.com/artist/2035639",
"locale": "en-us",
"images": [
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/9c1/12b833e2-a349-4e59-b02a-9cad62cab9c1_118101_RETINA_PORTRAIT_16_9.jpg",
"width": 640,
"height": 360,
"fallback": false
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/9c1/12b833e2-a349-4e59-b02a-9cad62cab9c1_118101_ARTIST_PAGE_3_2.jpg",
"width": 305,
"height": 203,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/c/df8/81eadad8-4449-412e-a2b1-3d8bbb78edf8_106181_TABLET_LANDSCAPE_16_9.jpg",
"width": 1024,
"height": 576,
"fallback": true
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/9c1/12b833e2-a349-4e59-b02a-9cad62cab9c1_118101_EVENT_DETAIL_PAGE_16_9.jpg",
"width": 205,
"height": 115,
"fallback": false
},
{
"ratio": "4_3",
"url": "http://s1.ticketm.net/dam/a/9c1/12b833e2-a349-4e59-b02a-9cad62cab9c1_118101_CUSTOM.jpg",
"width": 305,
"height": 225,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/c/df8/81eadad8-4449-412e-a2b1-3d8bbb78edf8_106181_TABLET_LANDSCAPE_LARGE_16_9.jpg",
"width": 2048,
"height": 1152,
"fallback": true
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/a/9c1/12b833e2-a349-4e59-b02a-9cad62cab9c1_118101_RECOMENDATION_16_9.jpg",
"width": 100,
"height": 56,
"fallback": false
},
{
"ratio": "16_9",
"url": "http://s1.ticketm.net/dam/c/df8/81eadad8-4449-412e-a2b1-3d8bbb78edf8_106181_RETINA_LANDSCAPE_16_9.jpg",
"width": 1136,
"height": 639,
"fallback": true
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/c/df8/81eadad8-4449-412e-a2b1-3d8bbb78edf8_106181_TABLET_LANDSCAPE_3_2.jpg",
"width": 1024,
"height": 683,
"fallback": true
},
{
"ratio": "3_2",
"url": "http://s1.ticketm.net/dam/a/9c1/12b833e2-a349-4e59-b02a-9cad62cab9c1_118101_RETINA_PORTRAIT_3_2.jpg",
"width": 640,
"height": 427,
"fallback": false
}
],
"classifications": [
{
"primary": true,
"segment": {
"id": "KZFzniwnSyZfZ7v7nJ",
"name": "Music"
},
"genre": {
"id": "KnvZfZ7vAvF",
"name": "Dance/Electronic"
},
"subGenre": {
"id": "KZazBEonSMnZfZ7vAJ1",
"name": "Club Dance"
}
}
],
"_links": {
"self": {
"href": "/discovery/v2/attractions/K8vZ9173V70?locale=en-us"
}
}
}
]
}
},
您將需要使用內部events數組而不是外部_embedded對象。 您可以通過以下兩種方式之一完成此操作。
設置狀態以保存內部events數組
response.json().then(concerts => this.setState({
concerts: concerts._embedded.events,
// name: Object.values(concerts._embedded.events[0].images[0]),
// image: concerts._embedded.events[0].images[0],
// url: concerts._embedded.events[0].url,
// info: concerts._embedded.events[0].info,
// date: concerts._embedded.events[0].classifications[0].name,
}));
要么
使用狀態時訪問內部events數組
this.state.concerts.events.map((concert) => {
return (
<div>
{concert}
</div>
);
})
未捕獲（承諾）TypeError：this.state。[prop] .map不是函數
[英]Uncaught (in promise) TypeError: this.state.[prop].map is not a function
未捕獲（承諾）TypeError：items.map 不是 function
[英]Uncaught (in promise) TypeError: items.map is not a function
Uncaught (in promise) TypeError: res.map is not a function
[英]Uncaught (in promise) TypeError: res.map is not a function
未捕獲（承諾）類型錯誤：myorders.map 不是 function
[英]Uncaught (in promise) TypeError: myorders.map is not a function
API.js:54 未捕獲（承諾中）類型錯誤：this.state.data.map 不是 ZC1C42150748E78
[英]API.js:54 Uncaught (in promise) TypeError: this.state.data.map is not a function
Uncaught (in promise) TypeError: _this is not a function
[英]Uncaught (in promise) TypeError: _this is not a function
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