[英]Angular TypeError cannot set property 'Data' of undefined
在我的代碼中,我在 ngOnInit 中調用此操作,以便在頁面重新打開時能夠看到以前編輯的數據。 StickerData
是 IStickerData 的一個屬性,它是一個接口。 我不斷得到
ERROR TypeError: Cannot set property 'StickerData' of undefined
at SafeSubscriber._next (sticker-preview.component.ts:54)
at SafeSubscriber.__tryOrUnsub (Subscriber.js:183)
at SafeSubscriber.next (Subscriber.js:122)
at Subscriber._next (Subscriber.js:72)
at Subscriber.next (Subscriber.js:49)
at FinallySubscriber._next (Subscriber.js:72)
at FinallySubscriber.next (Subscriber.js:49)
at CatchSubscriber._next (Subscriber.js:72)
at CatchSubscriber.next (Subscriber.js:49)
at MapSubscriber._next (map.js:35)
subscribe((response: any) => this._stickerData.StickerData = response);
當我打開頁面時。 我在這里想念什么?
TS:
private _stickerData: IStickerData;
Filter: IFilter;
@Input()
set StickerData(prm: IStickerData) {
if (this._stickerData != prm) {
this._stickerData = prm;
}
}
get StickerData(): IStickerData {
return this._stickerData;
}
ngOnInit() {
this._productionService.getStickerDataList(this.Filter)
.subscribe((response: any) => this._stickerData.StickerData = response);
}
服務TS:
getStickerDataList(data: IFilter): Observable<IStickerData[]> {
return this._http.post("Production/GetStickerDataList", data);
}
您需要在訪問它的屬性之前初始化變量。
private _stickerData: IStickerData = Object.create(null);
現在看起來變量this.Filter
在發送到服務之前也未定義。
您正在執行this._stickerData.StickerData = [...]
但this._stickerData
未初始化,因此其值為undefined
。
您可能希望添加一個默認值:
private _stickerData: IStickerData = {};
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.