alokkarma

<div class="p-grid" style="margin-top:15px; padding:10px;">
<p-table [columns]="cols" [value]="cars" dataKey="vin" [paginator]="true"
[rows]="10" [totalRecords]="cars.length" pageLinkSize="3" (onPage)="onPage($event)"
    (onRowExpand)="onRowExpand()" (onRowCollapse)="onRowCollapse()" 
    [expandedRowKeys]="expandedRows">
  <ng-template pTemplate="header" let-columns>
      <tr>
          <th style="width: 3em">
            <a style="cursor: pointer;font-size: 16px; color:teal;" (click)="expandAll()"><i
              *ngIf="!isExpanded" class="fa fa-plus-circle" aria-hidden="true"></i>