+ <mat-form-field class="input-display-block">
+ <input matInput type="text" placeholder="Traffic class" formControlName="class">
+ <mat-hint align="end">Traffic class ID (1-256)</mat-hint>
+ <mat-error *ngIf="validateControl('window_length') && hasError('window_length', 'required')">Number is required
+ </mat-error>
+ <mat-error *ngIf="hasError('window_length', 'pattern')">Valid number is required</mat-error>
+ </mat-form-field>