角度訂閱返回未定義的對象

Question

所以我有材質對話框，在這個對話框中我有按鈕

<button mat-icon-button 
 (click)="getChoosenEmployee(element)">
</button>

元素是員工類型：

export interface Employee {
    index: number;
    employeeId: string;
    firstName: string;
    lastName: string;
}

當我關閉對話框時，我想將此員工發送到父組件，這就是我在做什么：

  getChoosenEmployee(employee: Employee) {

    this.dialogRef.close(
      employee
    );
  }

在父組件中，我通過此函數接收

dialogRef.afterClosed().subscribe(result => {
      console.log(this.choosenEmployee);
      this.choosenEmployees.push(this.choosenEmployee);
 });

推給我錯誤：

core.js:4197 ERROR TypeError: Cannot read property 'push' of undefined
    at SafeSubscriber._next (add-workday-form.component.ts:72)
    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 Subject.next (Subject.js:39)
    at SafeSubscriber._next (dialog.js:381)
    at SafeSubscriber.__tryOrUnsub (Subscriber.js:183)
    at SafeSubscriber.next (Subscriber.js:122)
    at Subscriber._next (Subscriber.js:72)

Answer 1

您是否初始化了this.choosenEmployees數組？ 該錯誤表明this.choosenEmployees未定義，而不是this.choosenEmployee對象。