How to scroll two lists at once with angular cdk virtual scroll?

Question

I would like to do something like this:

<cdk-virtual-scroll-viewport [itemSize]="25">
  <svg>
    <g *cdkVirtualFor="let item of items">...</g>
  </svg>
  <div *cdkVirtualFor="let item of items">...</div>
</cdk-virtual-scroll-viewport>

And have both the g and div elements scroll at at the same time (they both have the same height). Is this possible? Doing exactly as I have outlined here results in an error: Error: CdkVirtualScrollViewport is already attached.

score 1 · Answer 1 · answered Oct 27 '20 at 19:50

Here is how I was able to achieve 2 lists with virtual-scroll: I combined the lists, added a type, sort your list by type, and did a break when type is changed:

ts file:
    didGroupChange(jobNow:JobsResponse, jobPrev:JobsResponse){
            return jobNow.type!==jobPrev?.type;
        }
HTML:
    <cdk-virtual-scroll-viewport [itemSize]="20" class="scroll-panel-jobs">                         
    <dl>
        <ng-container *cdkVirtualFor="let job of  country?.jobsList;  let index = index;">
             <dt *ngIf="didGroupChange(job,country?.jobsList[index-1])" class="line row h15 title-job">{{job.type}}</dt>    
             <dd class="line row h16">{{job.title}} </dd>                     
        </ng-container>
      </dl>                 
</cdk-virtual-scroll-viewport>

How to scroll two lists at once with angular cdk virtual scroll?

1 Answers1