管道转换后在ngFor中获取数组的长度 [英] Get length of array in ngFor after pipes transformation

问题描述

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>

很遗憾，ngFor中没有长度。我该如何解决这个问题，以使ngFor内部具有可用的长度？

Unfortunately length doesn't exist in ngFor. How can I work around this issue to have the length available inside my ngFor?

推荐答案

另一个解决方案可能是以下

Another solution could be the following

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

柱塞示例

Plunker Example

另请参见

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

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

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