How to programmatically scroll to item with angular's material virtual scroll?

Question

I have a list that has many items and each item can be selected. For this I use Angular Material Virtual Scroll. When an item is selected, the selected item is highlighted a

Answer 1

Sure, you will need to get a reference to the CdkVirtualScrollViewport instance.

@ViewChild(CdkVirtualScrollViewport) viewPort: CdkVirtualScrollViewport;

scrollToMiddle(){
  this.viewPort.scrollToIndex(list.length/2, "smooth");
}

An example can be found in this stackblitz

For the requirement of scrolling to the index of the selected element in the list, you could do the following:

ngAfterViewInit(){
  const selectedIndex = this.list.findIndex(elem => elem.id === this.selectedItem.id);
   if(selectedIndex > -1){
     this.viewPort.scrollToIndex(selectedIndex);
   }
}

Note: this assumes that the list is already loaded during the ngAfterViewInit lifehook. As you havent provided more information about how the list value is set, this is the best that I can provide.