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删除observer中的订阅

subscriptions angular

0

TSG · 技术社区 · 7 年前

  // Allow the user to navigate away from this page
  public canDeactivate(): Observable<boolean> {

    // Popup a prompt dialog
    const title = 'Lose Changes';
    const prompt = 'Are you sure you want to lose your changes?';
    this.dialogWindow.show(EDialogTypes.EDialogYesNo, EDialogStyles.EDialogStyleWarning, title, prompt);

    return Observable.create(observer => {
      this.dialogWindow.observable.subscribe(buttonPressed => {
        const proceed = (buttonPressed === EButtonPressed.EButtonPressedYes);
        console.log('Allow proceed: ' + proceed);
        observer.next(proceed);
        observer.complete();
      });
    });
  }

1 回复 | 直到 7 年前

1

Bruno João 7 年前

您可以保存对变量的订阅,并在获得所需内容后使用它取消订阅。类似这样:

return Observable.create(observer => {
  let subscription = this.dialogWindow.observable.subscribe(buttonPressed => {
    const proceed = (buttonPressed === EButtonPressed.EButtonPressedYes);
    console.log('Allow proceed: ' + proceed);
    observer.next(proceed);
    observer.complete()
    subscription.unsubscribe(); // here you unsubscribe
  });
});