如何使用 Angular 异步管道调用从异步流接收的函数?错误:操作表达式中不能包含管道

Question

我想调用一个使用 Angular 9 异步管道从数据流接收的函数。

以下代码(onApprove)="(modalData$ | async).onApprove()"引发此错误：Cannot have a pipe in an action expression

我在网上找不到解决方案，只能参考有关ngModel的问题(示例(

<div class="confirm-modal-container">
<div class="title">{{(modalData$ | async).title}}</div>
<div class="body">{{(modalData$ | async).body}}</div>
<app-action-buttons (onApprove)="(modalData$ | async).onApprove()" (onCancel)="(modalData$ | async).onCancel()" [cancelText]="currentStep === 0 ? 'Cancel' : 'Previous'" [approveText]="control[currentStep].actionBtnText"></app-action-buttons>
</div>

数据流来自 Redux 存储

@select((state: IAppState) => state.ui.modal.modalData) readonly modalData$: Observable<any>;

Answer 1

您可以在ng-container分组元素中提取响应，并在所有较低的嵌套级别使用 reposne。这样，您甚至不需要每次都打电话给async。

<div class="confirm-modal-container">
<ng-container *ngIf="modalData$ | async as modelData">
<div class="title">{{modelData.title}}</div>
<div class="body">{{modelData.body}}</div>
<app-action-buttons (onApprove)="modelData.onApprove()" (onCancel)="modelData.onCancel()" [cancelText]="currentStep === 0 ? 'Cancel' : 'Previous'" [approveText]="control[currentStep].actionBtnText"></app-action-buttons>
</ng-container>
</div>