如何*保存*角度材料模态对话框的结果？

Question

我有一个组件打开一个模态对话框，让用户输入两个日期。然后我想将这两个日期保存到组件后面的数据库模型中，但是我无法在何时何地获取这些结果。

要清楚：我当前可以在主要组件的模板中看到对话框结果作为两个日期，但我想知道，在...我的主要组件中的某些方法...当对话框关闭且日期为不再为空 - 所以我可以将它们保存到数据库中。

我的主要组件模板有一个带有onClick事件的按钮：

<a class="btn btn-sm role="button"><mat-icon title="Get Dates" (click)="onClickGetDates(appt)">flag</mat-icon></a> Result from dialog: {{ dateRangeArray }}

主要组件实现onClick事件：

onClickGetDates(appt) {
    this.dialogService
      .confirmDateRange('Get Dates', 'Enter two dates:',
        appt.beginDate, appt.endDate)
      .subscribe(res => this.dateRange = res);
.
.
// I would like to now save the dateRange result to my database, but at this point, result is [null,null], so the code below does nothing (except null out the dates):
appt.beginDate = dateRange[0];
appt.endDate = dateRange[1];
this.apptdata.updateAppt(appt);
}

这是在Dialog Service中定义的confirmDateRange，它实际显示了对话框：

public confirmDateRange(title: string, message: string, begin: Date, end: Date): Observable<boolean> {
    let dialogRef: MatDialogRef<ConfirmDialogComponent>;

    dialogRef = this.dialog.open(ConfirmDialogComponent);
    dialogRef.componentInstance.title = title;
    dialogRef.componentInstance.message = message;
    dialogRef.componentInstance.beginDate = begin;
    dialogRef.componentInstance.endDate = end;

    return dialogRef.afterClosed();
  }

对话框组件：

export class ConfirmDialogComponent implements OnInit {

  public title: string;
  public message: string;

  public beginDate: Date;
  public endDate: Date;

  constructor(public dialogRef: MatDialogRef<ConfirmDialogComponent>) { }

  ngOnInit() {
  }

对话框的模板：

<h2>{{ title }}</h2>
<hr>
<p>{{ message }}</p>

<!--Date Picker Begin-->

<mat-form-field>
  <input matInput [matDatepicker]="beginDatePicker" placeholder="Beginning" [(ngModel)]="beginDate">
  <mat-datepicker-toggle matSuffix [for]="beginDatePicker"></mat-datepicker-toggle>
  <mat-datepicker #beginDatePicker></mat-datepicker>
</mat-form-field>


<!--Date Picker End-->

<mat-form-field>
  <input matInput [matDatepicker]="endDatePicker" placeholder="Ending" [(ngModel)]="endDate">
  <mat-datepicker-toggle matSuffix [for]="endDatePicker"></mat-datepicker-toggle>
  <mat-datepicker #endDatePicker></mat-datepicker>
</mat-form-field>


<!--OK-->
<button type="button" mat-raised-button
        (click)="dialogRef.close([beginDate, endDate])">OK</button>

<!--Cancel-->
<button type="button" mat-button
        (click)="dialogRef.close()">Cancel</button>

在对话框中单击“确定”后，我可以在主要组件的模板中看到带有两个日期的结果数组，如下所示：Result from dialog: {{ dateRangeArray }}。试图在onClickGetDates中访问相同的结果是“太快了”，结果是一个空数组...那么，where / when是在主要组件中查看结果的适当位置？

我觉得我错误地使用了对话框的AfterClose（）事件，并且我应该能够在事件被触发后检索结果，但是我仍然对Angular太过绿色以了解我做错了什么。

Answer 1

试试这个

onClickGetDates(appt) {
    this.dialogService
      .confirmDateRange('Get Dates', 'Enter two dates:',
        appt.beginDate, appt.endDate)
      .subscribe(res => 
      {this.dateRange = res;
//Set the appt's properties inside the subscribe
appt.beginDate = this.dateRange[0];
appt.endDate = this.dateRange[1];
this.apptdata.updateAppt(appt);
});

Answer 2

                Use @Output() to send dates from inner component to outer component and implement a function that call on Ok button and emit that data from that function like : 
                `@Output() response =  new EventEmitter()<any>;

                onOkClicked()
                {
                this.response.next({beginDate : beginDate , endDate: endDate});
                this.dialogRef.close();
                }

                onCancelClicked()
                {
                this.dialogRef.close();
                }

                confirmDateRange(title: string, message: string,appt): Observable<boolean> {
                let dialogRef: MatDialogRef<ConfirmDialogComponent>;

                dialogRef = this.dialog.open(ConfirmDialogComponent);
                dialogRef.componentInstance.title = title;
                dialogRef.componentInstance.message = message;
                dialogRef.componentInstance.beginDate = appt.begin;
                dialogRef.componentInstance.endDate = appt.end;
                dialogRef.componentInstance.response.subscribe(res : any => {
                appt.begin = res.beginDate;
                appt.end = res.endDate;
                });

              }

           onClickGetDates(title:string , message :string , appt) {
           this.confirmDateRange(title,message,appt);
            }
                `