本文介绍了如何在嵌套的json对象上执行ngFor循环?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这似乎很简单，但是以某种方式我没有让内部数组元素在Angular 2上执行ngFor循环.
It seems to be simple thing to do, but somehow i did not get inner array element to do ngFor loop on Angular 2.
我有如下的json数组，我需要遍历嵌套数组的响应数组中的可用路由".现在任何人都可以让我知道如何获得应该简单的路由，并且我正在尝试这样.routes= respondeJson [0] .routes或this.routes = resonseJson [0] ['routes']但没有运气.请帮助考虑我在Angular 2上的入门级别，或者说使用JSON.
I have json array as below, and i need to iterate through available 'routes' in my response array which is nested element.Now can any one let me know how can i get route which should be simple and i am trying like this.routes=respondeJson[0].routes Or this.routes=resonseJson[0]['routes'] but no luck. Please help considering my entry level here on Angular 2 or say working with JSON.
[
{
"routes": {
"0": {
"budget": 326,
"toCity": "United States",
"QuoteIds": [
1,
2
],
"options": 2
},
"1": {
"budget": 374,
"toCity": "Thailand",
"QuoteIds": [
3,
4
],
"options": 2
},
"2": {
"budget": 382,
"toCity": "Singapore",
"QuoteIds": [
5,
6
],
"options": 2
},
"3": {
"budget": 451,
"toCity": "Taiwan",
"QuoteIds": [
7
],
"options": 1
},
"5": {
"budget": 112,
"toCity": "Turkey",
"QuoteIds": [
8
],
"options": 1
},
"6": {
"budget": 314,
"toCity": "Saudi Arabia",
"QuoteIds": [
9
],
"options": 1
},
"8": {
"budget": 518,
"toCity": "Indonesia",
"QuoteIds": [
10
],
"options": 1
},
"10": {
"budget": 384,
"toCity": "Hong Kong",
"QuoteIds": [
11,
12
],
"options": 2
},
"11": {
"budget": 232,
"toCity": "Qatar",
"QuoteIds": [
13
],
"options": 1
},
"22": {
"budget": 254,
"toCity": "Algeria",
"QuoteIds": [
14
],
"options": 1
},
"23": {
"budget": 241,
"toCity": "Kuwait",
"QuoteIds": [
15
],
"options": 1
},
"24": {
"budget": 175,
"toCity": "Israel",
"QuoteIds": [
16,
17
],
"options": 2
},
"25": {
"budget": 266,
"toCity": "Oman",
"QuoteIds": [
18,
19
],
"options": 2
},
"28": {
"budget": 762,
"toCity": "Argentina",
"QuoteIds": [
20,
21
],
"options": 2
},
"30": {
"budget": 78,
"toCity": "Iceland",
"QuoteIds": [
22
],
"options": 1
},
"37": {
"budget": 327,
"toCity": "Canada",
"QuoteIds": [
23,
24
],
"options": 2
},
"39": {
"budget": 238,
"toCity": "Iran",
"QuoteIds": [
25
],
"options": 1
},
"40": {
"budget": 129,
"toCity": "Cyprus",
"QuoteIds": [
26
],
"options": 1
},
"41": {
"budget": 267,
"toCity": "United Arab Emirates",
"QuoteIds": [
27,
28
],
"options": 2
},
"42": {
"budget": 252,
"toCity": "Lebanon",
"QuoteIds": [
29
],
"options": 1
},
"43": {
"budget": 427,
"toCity": "Iraq",
"QuoteIds": [
30
],
"options": 1
},
"50": {
"budget": 142,
"toCity": "Montenegro",
"QuoteIds": [
31
],
"options": 1
},
"55": {
"budget": 418,
"toCity": "Cuba",
"QuoteIds": [
32
],
"options": 1
},
"56": {
"budget": 492,
"toCity": "China",
"QuoteIds": [
33,
34
],
"options": 2
},
"57": {
"budget": 444,
"toCity": "India",
"QuoteIds": [
35
],
"options": 1
},
"62": {
"budget": 477,
"toCity": "Japan",
"QuoteIds": [
36,
37
],
"options": 2
},
"63": {
"budget": 3377,
"toCity": "Costa Rica",
"QuoteIds": [
38
],
"options": 1
},
"65": {
"budget": 210,
"toCity": "Georgia",
"QuoteIds": [
39
],
"options": 1
},
"66": {
"budget": 391,
"toCity": "Sri Lanka",
"QuoteIds": [
40,
41
],
"options": 2
},
"67": {
"budget": 258,
"toCity": "Russia",
"QuoteIds": [
42
],
"options": 1
},
"68": {
"budget": 82,
"toCity": "Poland",
"QuoteIds": [
43
],
"options": 1
},
"71": {
"budget": 104,
"toCity": "Finland",
"QuoteIds": [
44
],
"options": 1
},
"72": {
"budget": 150,
"toCity": "Austria",
"QuoteIds": [
45,
46
],
"options": 2
},
"73": {
"budget": 68,
"toCity": "Spain",
"QuoteIds": [
47
],
"options": 1
},
"75": {
"budget": 106,
"toCity": "Portugal",
"QuoteIds": [
48
],
"options": 1
},
"77": {
"budget": 37,
"toCity": "Romania",
"QuoteIds": [
49
],
"options": 1
},
"78": {
"budget": 66,
"toCity": "Sweden",
"QuoteIds": [
50
],
"options": 1
},
"79": {
"budget": 77,
"toCity": "Denmark",
"QuoteIds": [
51
],
"options": 1
},
"86": {
"budget": 440,
"toCity": "South Africa",
"QuoteIds": [
52,
53
],
"options": 2
},
"87": {
"budget": 176,
"toCity": "Morocco",
"QuoteIds": [
54,
55
],
"options": 2
},
"88": {
"budget": 231,
"toCity": "Serbia",
"QuoteIds": [
56
],
"options": 1
},
"89": {
"budget": 279,
"toCity": "Bosnia and Herzegovina",
"QuoteIds": [
57
],
"options": 1
},
"90": {
"budget": 35,
"toCity": "Italy",
"QuoteIds": [
58
],
"options": 1
},
"92": {
"budget": 72,
"toCity": "Hungary",
"QuoteIds": [
59
],
"options": 1
},
"93": {
"budget": 155,
"toCity": "Croatia",
"QuoteIds": [
60
],
"options": 1
},
"94": {
"budget": 160,
"toCity": "Malta",
"QuoteIds": [
61,
62
],
"options": 2
},
"95": {
"budget": 163,
"toCity": "Greece",
"QuoteIds": [
63,
64
],
"options": 2
},
"96": {
"budget": 67,
"toCity": "Ireland",
"QuoteIds": [
65
],
"options": 1
},
"97": {
"budget": 60,
"toCity": "Netherlands",
"QuoteIds": [
66
],
"options": 1
},
"98": {
"budget": 68,
"toCity": "Norway",
"QuoteIds": [
67
],
"options": 1
},
"99": {
"budget": 71,
"toCity": "Latvia",
"QuoteIds": [
68
],
"options": 1
},
"100": {
"budget": 261,
"toCity": "Belgium",
"QuoteIds": [
69
],
"options": 1
},
"101": {
"budget": 60,
"toCity": "Bulgaria",
"QuoteIds": [
70
],
"options": 1
},
"102": {
"budget": 130,
"toCity": "Switzerland",
"QuoteIds": [
71
],
"options": 1
},
"103": {
"budget": 140,
"toCity": "Ukraine",
"QuoteIds": [
72
],
"options": 1
},
"104": {
"budget": 72,
"toCity": "France",
"QuoteIds": [
73
],
"options": 1
},
"105": {
"budget": 56,
"toCity": "Lithuania",
"QuoteIds": [
74
],
"options": 1
},
"106": {
"budget": 51,
"toCity": "United Kingdom",
"QuoteIds": [
75
],
"options": 1
},
"109": {
"budget": 116,
"toCity": "Czech Republic",
"QuoteIds": [
76
],
"options": 1
},
"110": {
"budget": 59,
"toCity": "Germany",
"QuoteIds": [
77
],
"options": 1
},
"113": {
"budget": 272,
"toCity": "Bahrain",
"QuoteIds": [
78,
79
],
"options": 2
},
"128": {
"budget": 634,
"toCity": "New Zealand",
"QuoteIds": [
80
],
"options": 1
},
"147": {
"budget": 610,
"toCity": "Australia",
"QuoteIds": [
81
],
"options": 1
},
"167": {
"budget": 187,
"toCity": "Moldova",
"QuoteIds": [
82
],
"options": 1
},
"168": {
"budget": 87,
"toCity": "Slovakia",
"QuoteIds": [
83
],
"options": 1
},
"175": {
"budget": 119,
"toCity": "Gibraltar",
"QuoteIds": [
84
],
"options": 1
},
"178": {
"budget": 545,
"toCity": "Laos",
"QuoteIds": [
85
],
"options": 1
}
},
"misc": {
"QuoteDateTime": "2017-04-21T13:56:00",
"MinPrice": 326,
"Direct": false,
"QuoteId": 1,
"skyLink": "http://partners.api.skyscanner.net/apiservices/referral/v1.0/AU/AUD/en-US/anywhere/amd/2017-05-18/2017-05-22?apiKey=wc161029621991497683276175998396"
},
"price": [
326,
392,
374,
434,
382,
470,
451,
112,
314,
518,
384,
553,
232,
254,
241,
175,
199,
422,
266,
1125,
762,
78,
403,
327,
238,
129,
290,
267,
252,
427,
142,
418,
492,
641,
444,
477,
937,
3377,
210,
713,
391,
258,
82,
104,
160,
150,
68,
106,
37,
66,
77,
624,
440,
176,
287,
231,
279,
35,
72,
155,
210,
160,
163,
200,
67,
60,
68,
71,
261,
60,
130,
140,
72,
56,
51,
116,
59,
374,
272,
634,
610,
187,
87,
119,
545
],
"outbound": {
"DepartureDate": "2017-05-18T00:00:00",
"Carrier": "WOW air",
"DestinationId": "EWR",
"OriginId": "LGW"
},
"airline": [
"WOW air",
"Lufthansa",
"Gulf Air",
"EVA Air",
"Turkish Airlines",
"British Airways",
"Turkish Airlines",
"Pegasus Airlines",
"Pegasus Airlines",
"Singapore Airlines",
"Air India",
"British Airways",
"Pegasus Airlines",
"Vueling Airlines",
"Pegasus Airlines",
"Pegasus Airlines",
"Monarch",
"Oman Air",
"Turkish Airlines",
"British Airways",
"United",
"WOW air",
"Air Transat",
"WestJet",
"Pegasus Airlines",
"Cobalt",
"Royal Brunei ",
"Turkish Airlines",
"Pegasus Airlines",
"Pegasus Airlines",
"easyJet",
"KLM",
"Austrian Airlines",
"British Airways",
"Air India",
"Alitalia",
"British Airways",
"Avianca",
"Pegasus Airlines",
"SriLankan Airlines",
"Qatar Airways",
"Pegasus Airlines",
"Wizz Air",
"Norwegian",
"eurowings",
"eurowings",
"Vueling Airlines",
"Monarch",
"Blue Air",
"Norwegian",
"Norwegian",
"Virgin Atlantic",
"Ethiopian Airlines",
"Iberia",
"Thomson Airways",
"Wizz Air",
"Pegasus Airlines",
"Flybe",
"Wizz Air",
"Monarch",
"Air Malta",
"easyJet",
"Pegasus Airlines",
"Aegean Airlines",
"Aer Lingus",
"Vueling Airlines",
"Norwegian",
"Wizz Air",
"eurowings",
"Wizz Air",
"SWISS",
"Ukraine International",
"Vueling Airlines",
"Wizz Air",
"Flybe",
"Flybe",
"Flybe",
"British Airways",
"Pegasus Airlines",
"Qatar Airways",
"Royal Brunei ",
"Wizz Air",
"Wizz Air",
"Monarch",
"Singapore Airlines"
],
"inbound": {
"DepartureDate": "2017-05-22T00:00:00",
"Carrier": "Norwegian",
"OriginId": "JFK",
"DestinationId": "LGW"
}
},
{
"misc": {
"QuoteDateTime": "2017-04-19T06:33:00",
"MinPrice": 392,
"Direct": true,
"QuoteId": 2,
"skyLink": "http://partners.api.skyscanner.net/apiservices/referral/v1.0/AU/AUD/en-US/anywhere/amd/2017-05-18/2017-05-22?apiKey=wc161029621991497683276175998396"
},
"outbound": {
"DepartureDate": "2017-05-18T00:00:00",
"Carrier": "Lufthansa",
"DestinationId": "EWR",
"OriginId": "LHR"
},
"inbound": {
"DepartureDate": "2017-05-22T00:00:00",
"Carrier": "Austrian Airlines",
"OriginId": "EWR",
"DestinationId": "LHR"
}
}
]
推荐答案
您在这里已经获得了一些不错的答案，但是所有人都在操纵您的响应并更改其构造，而不是按原样对待.您的响应中还有其他数据，并且希望保留这些数据，因此这是使用Pipe的解决方案.
You have gotten some good answers here, but all are manipulating your response and changing the build of it, instead of treating it as is. There is some other data in your response and want to retain the data, so here's a solution using Pipe instead.
您似乎在数组中有两个对象，但是只有一个包含routes.会一直这样吗?如果不是，则可能要迭代响应并显示所有对象的所有路由(如果存在)，因此我首先要对数组进行迭代，然后对路由进行迭代:
You seem to have two objects in your array, but only one contains routes. Will this always be the case? If not, you might want to iterate the response and show all routes (if exists) for all objects, so I'd iterate the array first, and then iterate the routes:
<!-- Iterate array -->
<div *ngFor="let obj of jsonData">
<!-- iterate routes for each object using pipe -->
<div *ngFor="let route of obj.routes | keys">
{{route.toCity}}
</div>
</div>
然后是密钥管道:
@Pipe({ name: 'keys', pure: false })
export class KeysPipe implements PipeTransform {
transform(value: any, args?: any[]): any[] {
// check if "routes" exists
if(value) {
// create instance vars to store keys and final output
let keyArr: any[] = Object.keys(value),
dataArr = [];
// loop through the object,
// pushing values to the return array
keyArr.forEach((key: any) => {
dataArr.push(value[key]);
});
// return the resulting array
return dataArr;
}
}
}
通过这种方式，您无需操纵响应，就可以访问响应随附的所有其他数据.
This way you have not manipulated your response, and you have access to all other data that is coming with the response.
这篇关于如何在嵌套的json对象上执行ngFor循环?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！