in sample/frontend/src/app/shared/fix/fix-table-primeng.directive.ts [16:24]
ngAfterViewInit() {
const viewportScrollable = document.getElementsByTagName('cdk-virtual-scroll-viewport');
// tslint:disable-next-line:prefer-for-of
for (let i = 0; i < viewportScrollable.length; i++) {
if (!viewportScrollable[i].classList.contains('ui-table-scrollable-body')) {
viewportScrollable[i].classList.add('ui-table-scrollable-body');
}
}
}