angular - Angular *ngIf="data$ async as data && data.payload; else noContent"

Question

我只想有条件地显示一个包含数据的块，否则我将显示一个 noContent 块。数据是从服务器获取的。

<ng-container *ngIf="data$ async as data && data.payload; else noContent">
{{data.payload | json}}
</ng-container>

<ng-template #noContent> No content found </ng-template>

注意： 1-我不想实现两个s，即：

<ng-container *ngIf="data$ async as data ; else noContent">
  <ng-container *ngIf="data.payload; else noContent">
  {{data.payload | json }}
  </ng-container>
</ng-container>
...

2-以下语句有效

*ngIf="xx && yy"
*ngIf="data$ as data"
*ngIf="xx && data$ as data"
*ngIf="(data$ as data)?.payload?.length>0; else noContent"

Answer 1

像这样试试

<ng-container *ngIf="(data$ | async ) as d; else noContent">
    <ng-container *ngIf="d.payload?.length > 5 ;else noContent">
        <h3>
            {{d.payload | json}}
        </h3>
    </ng-container>
</ng-container>

<ng-template #noContent> No content found </ng-template>

演示