[英]Add new object property to JSON response in Angular
我正在嘗試向我的 JSON 響應添加一個新的對象屬性。
我的示例 JSON 響應
{
"products": [{
"id": 1,
"name": "xyz"
}]
}
獲得響應后需要將新的對象屬性(顯示)添加到同一個 JSON 響應中
{
"products": [{
"id": 1,
"name": "xyz",
"show": false
}]
}
這是我的示例代碼
import {Component,OnInit} from '@angular/core';
import {Http, Response} from '@angular/http';
import 'rxjs/Rx';
@Component({
templateUrl:'./electronics.html'
})
export class electronicsComponent{
productListElectronics={};
productListElectronicResponse: Object;
error:Object;
constructor(private http: Http) {
this.productListElectronicResponse={};
this.error={};
http.get('../json/electronics/electronics.json').map((res: Response) =>res.json()).subscribe(res =>
{
for(var i = 0; i <= res['products'].length; i++){
res['products'][i].show=false;
}
console.log(res);
}, error => this.error = error );
}
}
但是控制台不斷拋出以下錯誤:
ERROR TypeError: Cannot set property 'show' of undefined at SafeSubscriber.http.get.map.subscribe._this.error [as _next] (products.component.ts:22) at SafeSubscriber.__tryOrUnsub (Subscriber.ts:238) at SafeSubscriber.next (Subscriber.ts:190) at Subscriber._next (Subscriber.ts:135) at Subscriber.next (Subscriber.ts:95) at MapSubscriber._next (map.ts:80) at MapSubscriber.Subscriber.next (Subscriber.ts:95) at XMLHttpRequest.onLoad (xhr_backend.ts:104) at ZoneDelegate.invokeTask (zone.js:398) at Object.onInvokeTask (ng_zone.ts:253) at ZoneDelegate.invokeTask (zone.js:397) at Zone.runTask (zone.js:165) at XMLHttpRequest.ZoneTask.invoke (zone.js:460)
你的錯誤在這里
for(var i = 0; i <= res['products'].length; i++)
它應該是
for(var i = 0; i <res['products'].length; i++)
:)
這應該適用於遍歷您的對象數組:
for(var key in res['products']){
res['products'][key].show=false;
}
可能性一:
刪除=
from <=
from for
循環,否則它會為未定義的對象再運行一次。
for(var i = 0; i < res['products'].length; i++){
res['products'][i].show=false;
}
上面的解決方案不起作用,然后嘗試下面的可能性 2
我懷疑res['products']
返回一個json array
。
運行下面的代碼行並在此處附加您的結果:
console.log(res['products'])
for(var i = 0; i <= res['products'].length; i++){
console.log(res['products'][i]);
res['products'][i].show=false;
}
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