Angular 4 * ngif有条件检查

Question

I need to check a value for negative 1 that I use for failure but I don't want to display that value. Instead I want to display either "N/A" or "--" but I am new to angular and not sure how. My material table is listed below. Any help would be appreciated.

<div>
   <ng-container matColumnDef="Milliseconds">
      <mat-header-cell *matHeaderCellDef mat-sort-header> Milli seconds </mat-header-cell>
  <mat-cell *matCellDef="let latency"> {{latency.Milliseconds}} </mat-cell>
   </ng-container>
</div>

Thanks in advance

Answer 1

您可以使用三元运算符执行此操作 ：

<mat-cell *matCellDef="let latency">{{ latency.Milliseconds === -1 ? '--' : latency.Milliseconds }}</mat-cell>