student-response-chart.component.html

<div *ngIf="!isLoading && studentResponseChart">
    <label for="class-select">Choose a Class: </label>
    <select id="class-select" [(ngModel)]="currentClass" (change)="switchClass()" name="classes">
      <option [ngValue]="undefined" selected>Select...</option>
      <option *ngFor="let rgc of responseGraphClasses" [ngValue]="rgc">{{rgc.classCode}}</option>
    </select>
  <div [chart]="studentResponseChart"></div>
</div>