管道改造后获取ngFor中的数组长度

Question

我有以下模板:

<div *ngFor="let item of myArray | customPipe1 | customPipe2; let l = length">
  Here is the length of my ngFor : {{l}}
</div>

不幸的是,ngFor中不存在长度.我如何解决这个问题,以便在我的ngFor中提供长度？

Answer 1

另一种解决方案可能如下

<div *ngFor="let item of myArray | customPipe1 | customPipe2; let l = count">
  Here is the length of my ngFor : {{l}}
</div>

Plunker示例

也可以看看

• https://github.com/angular/angular/blob/master/packages/common/src/directives/ng_for_of.ts#L15-L17

Answer 2

<div *ngFor="let item of myArray | customPipe1 | customPipe2 as result">
  Here is the length of my ngFor : {{result.length}}
</div>

另见https://angular.io/api/common/NgForOf