export class VirtualTable { readonly scrollElement = viewChild<ElementRef>('scrollElement') readonly rows = computed(() => this.table.getRowModel().rows) readonly rowVirtualizer = injectVirtualizer(() => ({ count: this.rows().length, scrollElement: this.scrollElement()?.nativeElement, estimateSize: () => 34, getItemKey: (index) => this.rows()[index]!.id, overscan: 5, })) readonly virtualRows = computed(() => this.rowVirtualizer.getVirtualItems()) readonly totalSize = computed(() => this.rowVirtualizer.getTotalSize()) }


## Core Patterns

### Derive reactive models

Use `computed(() => table.getRowModel().rows)` and `computed(() => table.getVisibleLeafColumns())`. `injectVirtualizer` tracks signal reads in its initializer and requires injection context.

### Own the layout contract

Give the scroll element bounded overflow, create a total-size spacer, and translate or measure each virtual item. Use grid/flex widths for dynamic rows/columns and keep sticky headers inside the correct scroll geometry.

### Gate infinite fetches

When the last virtual item approaches fetched length, fetch only if more server rows exist and a request is not active. Manual sorting requires server-sorted pages and a reset/refetch policy.

## Common Mistakes

### CRITICAL Constructing outside injection context

Wrong:

```ts
export function virtualize(options) {
  return injectVirtualizer(() => options)
}

Correct:

export class VirtualTable {
  readonly virtualizer = injectVirtualizer(() => options())
}

The Angular virtualizer follows DI lifecycle rules just like injectTable.

Source: examples/angular/virtualized-rows/src/app/app.ts

HIGH Virtualizing raw data

Wrong:

readonly rows = computed(() => this.data())

Correct:

readonly rows = computed(() => this.table.getRowModel().rows)

Raw data bypasses Table filtering, sorting, expansion, grouping, and pagination.

Source: docs/framework/angular/guide/virtualization.md

HIGH Forgetting spacer and transforms

Wrong:

@for (item of virtualRows(); track item.key) {
<div>{{ rows()[item.index].id }}</div>
}

Correct:

<div [style.height.px]="totalSize()" style="position:relative">
  <div style="position:absolute"></div>
</div>

Virtual computes ranges and sizes but does not apply DOM geometry, sticky CSS, or column widths.

Source: examples/angular/virtualized-columns/src/app/app.ts

API Discovery

Inspect installed @tanstack/angular-table/dist/types/, installed @tanstack/angular-virtual/dist/, and the maintained Angular examples for current row, column, measurement, and infinite patterns.

with-tanstack-virtual

Setup