title: How to trigger a scroll event with Primeng virtuallScroll
body: <p>I'm using virtualScroller with primgeng 7.0 and angular 7. 
  What i want to do is when i load the page for the first time, i want to trigger the scroll event and go to a specific page, ex : the second page. Is there a function to do that with angular 7 and primeng and trigger the scrollbar to go to a specific page ? Here's my code : </p>
  
  <pre><code>&lt;p-table [columns]="cols" [value]="virtualBooks" [scrollable]="true" [rows]="20" scrollHeight="200px" [virtualScroll]="true" (onLazyLoad)="loadDataOnScroll($event)"
      [lazy]="true" [totalRecords]="totalRecords" [virtualRowHeight]="34" [showLoader]="false"&gt;
      &lt;ng-template pTemplate="header" let-columns&gt;
          &lt;tr&gt;
              &lt;th *ngFor="let col of columns"&gt;
                  {{col.header}}
              &lt;/th&gt;
          &lt;/tr&gt;
      &lt;/ng-template&gt;
      &lt;ng-template pTemplate="body" let-rowData let-columns="columns"&gt;
          &lt;tr style="height:34px"&gt;
              &lt;td *ngFor="let col of columns"&gt;
                  {{rowData[col.field]}}
              &lt;/td&gt;
          &lt;/tr&gt;
      &lt;/ng-template&gt;
  &lt;/p-table&gt;
  </code></pre>
  
  <p>Component : </p>
  
  <pre><code>loadDataOnScroll(event: LazyLoadEvent) {
     this.loading = true;
  
     // How to triger the scrollbar to go to a specific page ? ex : page 2
  
     setTimeout(() =&gt; {
              this.virtualBooks = this.allBooks.slice(event.first, event.first + event.rows);
              this.loading = false;
          }, 100);      
     }
  </code></pre>