我試圖在主題中的每個發出的值上呼叫另一個 observable。
我現在的問題是第一個發出的值subject觸發了switchMap并呼叫了confirmCsvUpload(...)，但每個下一個發出的值確實觸發了 ，switchMap但不會觸發confirmCsvUpload(...)。
有人能弄清楚為什么它不呼叫該函式嗎？
// Subject
private _confirmCsvUpload = new Subject<{ account: Account, previewData: PreviewData[], previewId: string }>();
// Subscription to the Subject
this._confirmCsvUpload.pipe(
switchMap(previewData => this._uploadCsvService.confirmCsvUpload(previewData.account, previewData.previewData, previewData.previewId))
).subscribe();
// Function which emits value to the subject (Not the function who gets called in the switchMap())
confirmCsvUpload(): void {
this._confirmCsvUpload.next({ account: this.account, previewData: this._previewData, previewId: this.getPreviewIdFromRoute() });
}
uj5u.com熱心網友回復：
我試著重播你的場景：
private _confirm$ = new Subject();
private _destroy$ = new Subject();
ngOnInit() {
this._confirm$
.pipe(
takeUntil(this._destroy$),
tap((v) => console.log('[SUB]', v)),
switchMap((v: any) => this.secondCall())
)
.subscribe();
}
secondCall() {
console.log('[SECOND CALL]');
return of();
}
callSub() {
console.log('[NEXT VALUE]');
this._confirm$.next('value');
}
ngOnDestroy() {
this._destroy$.next(null);
this._destroy$.complete();
console.log('[NG ON DESTROY]');
}
帶有 2 個呼叫的控制臺日志：
[NEXT VALUE]
[SUB] value
[SECOND CALL]
- 第二次：
[NEXT VALUE]
[SUB] value
[SECOND CALL]
轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/371497.html
標籤：javascript 有角的 打字稿 rxjs