bug(cdkTable & mat-table): virtual scrolling shifting issues introduced in 21.1

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
48/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Tranquilo
Stack tecnológico
angular, typescript
Área
frontend

Línea de trabajo

Comienza comparando los ejemplos de tablas de StackBlitz de v21.0 y v21.1.1, especialmente el comportamiento de virtual-scroll y el ejemplo de DataSource. En la tercera reproducción, descomenta la implementación asíncrona en table-virtual-scroll-example.component.ts y observa collectionViewer.onViewChange range.end mientras haces scroll. Se considera completado cuando mat-table y cdkTable hacen scroll sin desplazarse y el scroll infinito no obtiene las páginas repetidamente.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

area: cdk/scrolling area: cdk/table P2
Is this a regression?
  • Yes, this behavior used to work in the previous version
The previous version in which this bug was not present was

21.0.0

Description

In version v20.0.0 we had used a custom virtual scrolling strategy to allow tables with sticky headers. Upgrade to 21.0.0 broke the custom scrolling strategy implementation we have used so we decided to look for alternatives. Luckily, It seems that 21.0 also introduced support for tables with sticky header (or was introduced earlier, I am actually not sure which version added support), unfortunately, version 21.1 seems to introduce a bug which makes the scrolling shift around.

The bug can be seen in the example provided in the Table documentation as well. The documentation is still running on 21.0.0 but if you upgrade the example to 21.1.1, you can start seeing the buggy behavior when scrolling.

Scrolling seems to be fixed when itemSize is set to 0, however, in infinite scrolling implementations using DataSource that rely on collectionViewer.onViewChange range.end, it will continuously fetch the next page since range.end will always be the max value (3rd stackblitz link in the reproduction links has an async implementation mocked example that can be tested if uncommented in table-virtual-scroll-example.component.ts in constructor)

Example provided is on mat-table but cdkTable's behavior is the same if not worse

Reproduction

StackBlitz link:
v21.0 (original example on version 21.0): https://stackblitz.com/edit/dfp4dgn5?file=src%2Fexample%2Ftable-virtual-scroll-example.ts&startScript=start
v21.1.1 (original example but on version 21.1.1): https://stackblitz.com/edit/6wi4nsxd?file=src%2Fexample%2Ftable-virtual-scroll-example.ts&startScript=start
v21.1.1 with DataSource: https://stackblitz.com/edit/gt9emjwr?file=src%2Fexample%2Ftable-virtual-scroll-example.ts (much more noticeable in this example)

Steps to reproduce:

  1. Scroll around using the scroll wheel (also happens when you drag around the scrollbar thumb especially visible in tables with small amount of rows)
  2. 3rd link has an infinite scrolling implementation that can be tested if uncommented in table-virtual-scroll-example.component.ts's constructor
Expected Behavior

The table should scroll correctly without shifting around

Actual Behavior

Scrolling shifts around, some cases making it impossible to even scroll back up once you go all the way down and some cases scrolls upwards when scrolling down

Environment
  • Angular: 21.1.1
  • CDK/Material: 21.1.1
  • Browser(s): Chrome
  • Operating System (e.g. Windows, macOS, Ubuntu): Windows & macOS
Lenguaje dominante
TypeScript
Estrellas
25k
Forks
6.9k
Merge medio
2 d 7 h
PR fusionados (30 d)
83

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