Headless UI for virtualizing scrollable elements in Angular - Fixed for Angular 21+ (no allowSignalWrites)
npm install @shival99/angular-virtualEfficiently virtualize only the visible DOM nodes within massive scrollable elements using Angular, while maintaining complete control over markup and styles.
> NOTE: Angular Virtual requires Angular 17.
1. Install @tanstack/angular-virtual
``bash`
$ npm i @tanstack/angular-virtual
or
`bash`
$ pnpm add @tanstack/angular-virtual
or
`bash`
$ yarn add @tanstack/angular-virtual
or
`bash`
$ bun add @tanstack/angular-virtual
2. Inject a virtualizer
@tanstack/angular-virtual utilizes a helper function injectVirtualizer to create the virtualizer and integrate it with the component lifecycle:
`ts
import { Component, ElementRef, viewChild } from '@angular/core'
import { injectVirtualizer } from '@tanstack/angular-virtual'
@Component({
selector: 'my-virtualized-list',
template:
style="height: 400px; border: 1px solid gray; overflow: auto;"
>
[style.height.px]="virtualizer.getTotalSize()"
>
@for (row of virtualizer.getVirtualItems(); track row.index) {
[style.transform]="'translateY(' + row.start + 'px)'"
>
Row {{ row.index }}
,
})
export class MyVirtualizedList {
scrollElement = viewChild>('scrollElement') virtualizer = injectVirtualizer(() => ({
scrollElement: this.scrollElement(),
count: 1000,
estimateSize: () => 35,
overscan: 5,
}))
}
` Note that a ViewChild is used to get a reference to the scrolling container to allow the virtualizer to interact with it. The adapter will automatically unwrap the ElementRef for you.
You can also create a virtualizer that attaches to the Window with
:
`ts
import { Component } from '@angular/core'
import { injectWindowVirtualizer } from '@tanstack/angular-virtual' @Component({
selector: 'my-window-virtualized-list',
template:
,
})
export class MyWindowVirtualizedList {
virtualizer = injectWindowVirtualizer(() => ({
count: 1000,
estimateSize: () => 35,
overscan: 5,
}))
}
`3. If you need to update options on your virtualizer dynamically, make sure to use signals.
ts
import { Component, input } from '@angular/core'
import { injectVirtualizer } from '@tanstack/angular-virtual' @Component({...})
export class MyVirtualizedList {
items = input>()
virtualizer = injectVirtualizer(() => ({
scrollElement: this.scrollElement(),
count: this.items().length,
estimateSize: () => 35,
overscan: 5,
}))
}
``For more examples and detailed usage, visit the official documentation.