angular2-simple-ui/sui/sui.accordion/sui.accordion.group.component.html

Angular 2 Simple Material Design UI Components customisable with Simple 30 KB CSS with LESS support and full features support , just plugin up and run for clarity look at sample examples

<button class="{{'sui-btn-block sui-left-align ' + cssClass}}" [ngStyle]="style" (click)="isOpened=!isOpened"  >
    <span class="{{headerClass}}" [ngStyle]="headerStyle"> {{header}}  </span>  <i class="{{icon}}">  </i>
    <ng-content select="accordion-heading"></ng-content>
  </button>
<div class="sui-accordion-content sui-container" *ngIf="isOpened">
    <ng-content></ng-content>
</div>