从循环外部获取嵌套的* ngFor循环过滤数组的计数

Question

目前我使用过@ViewChildren装饰器。但它似乎没有帮助。

<div class="" *ngFor="let trip of flight.main.flightData.rows; let i = index; trackById" [attr.data-index]="i" >
        ........
        <div class="clearfix dateatime more-option" *ngFor="let option of trip.rows | subDepArrTime: i:selectedDepTime[i]:selectedArrTime[i]; let j=index;" [class.hidden]="!hideMe[x][i] && j > 0" #filtered[i]>
          ......
        </div>

        <div class="clearfix more">
          <div class="col-md-12 col-lg-12" *ngIf="filteredItems[i]?.length - 1 !== 0" (click)="hideMe[x][i]=!hideMe[x][i]"><span>+ {{filteredItems[i]?.length - 1}} more timing option(s)</span></div>
        </div>


      </div>