在条件下取消订阅不允许在 Angular RXJS 中订阅

Question

Im having a service that show wornings,info, and error notifications. Sometimes the notifications come very often. Lets say 20-30 in same time and im trying to avoid this thing by unsubscribing when a specifiv time interval happens.

After unsubscribe than its not anymore possibile to subscribe.

 const locationsSubscription = this.messageService .getMessage() .pipe(timeInterval(), tap(console.log)) .subscribe(message => { if (message.interval < 500) { locationsSubscription.unsubscribe(); } else { switch (message.type){ case MessageType.Info: this.showInfo(message.text); break; case MessageType.Warning: this.showWarning(message..text); break; case MessageType.Error: this.showError(message.value); break; } } });

Answer 1

Just use debounceTime or throttleTime to trigger warnings after some time is passed:

this.messageService
      .getMessage()
      .pipe(
         debounceTime(500) // to allow messages to trigger after 500ms of inactivity (idle)
         // throttleTime(500) // to allow only one message per 500ms (first or last)
      )