Angular 订阅 returns 未定义对象

Question

所以我有 material 对话框，在这个对话框中我有按钮

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

元素类型为员工：

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

当我关闭对话框时，我想将这个员工发送到父组件，这就是我正在做的：

  getChoosenEmployee(employee: Employee) {

    this.dialogRef.close(
      employee
    );
  }

在我通过此函数接收的父组件中

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

推送给我错误：

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 阵列？该错误表明 this.choosenEmployees 未定义，而不是 this.choosenEmployee 对象。

Angular 订阅 returns 未定义对象

Angular subscribe returns undefined object

angular

typescript

rxjs

angular-material

subscription